WO2005089437A2 - System and method for manipulating and processing materials using holographic optical trapping - Google Patents
System and method for manipulating and processing materials using holographic optical trapping Download PDFInfo
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- WO2005089437A2 WO2005089437A2 PCT/US2005/008934 US2005008934W WO2005089437A2 WO 2005089437 A2 WO2005089437 A2 WO 2005089437A2 US 2005008934 W US2005008934 W US 2005008934W WO 2005089437 A2 WO2005089437 A2 WO 2005089437A2
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Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/22—Processes or apparatus for obtaining an optical image from holograms
- G03H1/2294—Addressing the hologram to an active spatial light modulator
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y10/00—Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y20/00—Nanooptics, e.g. quantum optics or photonic crystals
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/04—Processes or apparatus for producing holograms
- G03H1/08—Synthesising holograms, i.e. holograms synthesized from objects or objects from holograms
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/0005—Adaptation of holography to specific applications
- G03H2001/0077—Adaptation of holography to specific applications for optical manipulation, e.g. holographic optical tweezers [HOT]
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H2225/00—Active addressable light modulator
- G03H2225/30—Modulation
- G03H2225/32—Phase only
Definitions
- the present invention relates to a system and method for manipulating and processing nanomaterials, micromateriais and picomaterials using holographic trapping.
- Nano materials may be generally described as materials and structures characterized as having at least one dimension in the nano-region. These materials have many and various applications. Nano materials include elemental materials e.g. clumps of elemental atoms, such as gold; and more ordered structures such as nanotubes and bucky balls. Nanotubes are hollow symmetrical objects formed of one or more atomic or molecular layers of particular interest are nanotubes made of carbon. Bucky balls are hollow spheres of atomic or elemental carbon. Other examples of nanomaterials and ordered nanostructures are discussed below.
- Nanotubes are particularly interesting nanostructures because their extraordinary mechanical, electrical, and optical properties enable a large array of offer the high degree of Versatility associated with carbon structures, for example, the ability to interface with DNA molecules. Sustained nanotube research for over a decade has created a myriad of -successful technologies. Insulating materials impregnated with nanotubes can be turned into conductors. Nanotube-reinforced materials are being developed for their improved mechanical strength.
- researchers have grown large arrays of aligned " nanotubes for use as electron emitters in displays.
- Other applications are envisioned which capitalize on the unique properties of carbon nanotubes. These applications include bulk materials with enormous elastic module, nanotube based electronic components, and structures employing nanotubes for guiding light.
- the present invention is based upon the discovery of a method for manipulating materials particles having one or more characteristics with an optical trap formed by modulating a laser beam with a diffractive optical element (DOE).
- DOE diffractive optical element
- the invention comprises, observing the functionality of the trap; recalculating the DOE values in response to the observation in order to adjust the functionality; and repeating the observation and recalculating ⁇ steps until satisfactory functionality is achieved for the at least one selected characteristic.
- the functionality of the trap may be varied by sculpting its shape.
- Various aspects of the invention involving manipulating of particles include one or more of: [00020] moving the trapped particle to a selected location; [00021] attaching a portion of the trapped particle to a surface or another particle; [00022] selectively heating selected ones of the attached particles for establishing selected flow patterns in adjacent media; [00023] stabilizing the particle in position; [00024] heating the particle with trap energy; [00025] moving the particle for collision with a proximate object; [00026] deforming the particle with a shock wave to perforate a proximate object; [00027] arranging particles in a selected pattern; [00028] selectively heating particles arranged in a selected pattern for establishing corresponding selected flow patterns of adjacent media; [00029] trapping a particle in a first selected trap having a first functionality; and superimposing a second selected trap on the particle having a second functionality;
- sorting particles according to their characteristics, including at least one of size, shape, length, conductivity, dielectric constant; refractive index; chilarity; thermal absorbtivity;
- [00036] selectively heating particles in a medium for causing expansio of the medium; [00037 " e ' ctf Te ' ly fl ea ⁇ i ⁇ cj L p SrftrSI efe " h a medium having a channel Therein for causing the medium to expand and thereby close the channel; [00038] discriminating particles based upon size, functionality, absorbence, "fluoresence, chirality, and length; and [00039] sensing energy emmitted from the particles in response to incident radiation. [00040]
- a system and method consistent with the present invention allows various industrial polymers and biopolymers to be attached to nanotubes and nanostructures.
- An exemplary embodiment of the present invention comprises a method for controlling nanotubes using a cloud of optically trapped nanospheres which facilitate manipulation and patterning of the tubes.
- the invention comprises an apparatus employing a diffractive optical element (DOE) such as a spatial light modulator; digital light processor or other diffractive element and a laser modulated thereby to produce a hologram for trapping nanoparticles.
- DOE diffractive optical element
- the invention further comprises a method for trapping and manipulating particles wherein a beam of electromagnetic radiation is modified so that it exhibits a selected 130 non-uniform characteristic.
- the non-uniformity may be in the energy distribution of the beam, or it may be in the medium employed in the manipulation space.
- the non-uniformity may employ discrete beams of different wavelengths, or the beam may be refracted or diffracted.
- the medium in the manipulation space may be formed of a variable index material or a filter having a variable density.
- the beam may be pulsed and its intensity and pulse width may be modulated.
- an output mask is located in a central region of the output of an objective lens such that wide angle output rays impinge on a CCD detector and narrow angle output rays are blocked.
- Another embodiment of the invention employs a programmable mask for a spatial light modulator which may be added to the SLM hologram in order to refine the beam characteristics.
- a corrective hologram may be added to the SLM hologram for one or more parameters of interest. According to the invention a parameter is adjusted and the beam is refocused to the tightest or best available focus using a two photon technique.
- the parameter of interest may be thereafter readjusted and the focusing technique is repeated until the desired accuracy is achieved.
- Each parameter may be separately sequenced in order to best optimize the beam.
- various corrections for differing media and focal length of the optical system may be calculated and added to a corrective hologram added to the SLM hologram.
- the invention also includes products produced by the methods and various apparatus disclosed herein. BRIEF DESCRIPTION OF THE DRAWINGS
- FIG. 1 depicts a ⁇ component view of an exemplary compact system to form optical traps for practicing methods consistent with the present invention
- FIG. 2 illustrates an inverted microscope to which the compact system of
- Fig. 1 attaches
- FIG. 3A depicts an exemplary dispersion of single-walled nanotubes in a target sample disposed in relation to the optical trapping system of FIG 1 ;
- FIG. 3B depicts an exemplary group of the single-walled nanotubes that have been aggregated by the optical trapping system of FIG 1 using laser to form a photo convective trap;
- FIG. 3C depicts a time average of multiple frames illustrating the ability of the optical trapping system of Fig. 1 to move trapped nanotubes in a pre-determined pattern before the nanotubes are deposited on a substrate; [00055f'tFfg/3iBf light produced by the op Tcal trapping system of Fig. 1 to saturate a CCD camera when depositing the aggregated nanotubes onto the substrate; -[00056] FIG. 3E depicts nanotubes deposited by the optical trapping system of Fig. -1 onto the substrate; [00057] FIG. 3F depicts a bright-field image illustrating the deposition of aggregated nanotubes in a particular pattern by the optical trapping system of Fig.
- FIG. 3G depicts a dark field image illustrating the trapping and partial extraction of a nanotube rope or fiber from a bundle of nanotubes by the optical trapping system of Fig. 1
- FIG. 3H depicts another dark field image illustrating further extraction of the nanotube rope or fiber shown in Fig. 3G from a bundle of nanotubes by the . optical tapping system of Fig. 1
- FIG. 3I depicts another dark field image illustrating the completed extract of the nanotube rope shown on Figs. 3G and 3H from a bundle of nanotubes by the optical trapping system of Fig. 1 ; [00061]
- FIG. 3J depicts trapping and rotating of a several bundles of nanotubes by the optical trapping system of FIG. 1 configured to produce an optical vortex;
- FIG. 3K depicts a time average of several frames illustrating a rotation pattern of the bundle of nanotubes generated by the optical trapping ' system of FIG. 1 when rotating the nanotubes using an optical vortex;
- FIG. 3L depicts multiple patterns produced in parallel by the optical trapping system of FIG. 1 when configured to focus the lasers of the system for holographic etching on a sheet of nanotubes deposited on a glass surface.
- FIGS. 4A and 4B illustrate a technique for manipulating elongated nanoparticles using colloidal spheres bonded to the ends of the particles.
- Figs 5A and 5B illustrate a technique for manipulating elongated nanoparticles using a cloud of particles to form a nanohandles.
- Figs. 6A-6B illustrate various techniques whereby elongated nanoparticles may be modified by stretching and wherein multicomponent particles may be separated.
- Figs.7A-7C illustrate techniques whereby nanoparticles may be attached to other structures in a selected pattern or orientation. [00068] ⁇ F'igs * Ai ⁇ # ⁇ lStra ⁇ il ⁇ ft ⁇ 4i'es whereby particles may be c ⁇ e'posited on a surface and whereby deposited particles or other materials may be modified by removal of material such as by etching. " [00069] Figs 9A-9F illustrate techniques whereby nanoparticles may be inserted into or imbedded in the wall of a cell. [00070] Figs 10A-10D illustrate techniques whereby nanochannels may be formed in the surface of a body.
- Figs 11 A-11 B illustrate a technique whereby a nanoparticle may be manipulated to form a zepto-syringe.
- Figs 12A-12E illustrate techniques whereby nanoparticles may be selectively trapped and heated in a fluid medium in order to establish selected flow patterns and wherein such selective heating may be employed in a nanofluidic device.
- Figs 13A-13E illustrate techniques whereby nanoparticles may be selectively heated in order to affect the bulk characteristics of a body and to thereby selectively control flows in nanochannels formed therein.
- Figs. 14A-14G illustrate techniques whereby nanoparticles may be formed into conductive strands having selectable electrical characteristics;
- Fig. 15 illustrates a block diagram for performing the method according to the invention.
- Figs. 16A-16G illustrate various arrangements where a graded energy source or graded medium are employed to effect trapping of particles.
- FIGs. 17A-17C illustrate an embodiment employing an output mask for blocking narrow angle output rays from a source.
- FIGs. 18A-18B illustrate an arrangement employing a corrective mask for an SLM.
- FIGs. 19A-19B illustrate an arrangement employing a corrective algorithm for an SLM.
- Figs. 20A-20B illustrate an arrangement where various parameters may be corrected by adding a corrective hologram to the SLM image.
- Nano materials having a sub-micron characteristic dimension of less than 10 "6 m. These particles may be atoms, molecules, agglomerations of such atomic, and molecular materials and elemental materials or may be ordered arrays of atomic or molecular materials. Nano materials may also include without limitation pharmaceuticals, bio materials and aggregated metals from sea water. They may also include regions where molecules are in solution or minute particles are in suspension. When it is useful for purposes of explanation, the particular structure of the nanoparticle, nanomaterial, or nanostructure is described. Often the terms are used interchangeably. Sometimes nano is used alone and it should be generally understood that nano in such case refers to the class of these materials; or to the dimension as in nano-meters (nm).
- the micromaterials may be less than 1mm and the picomaterials may be less than .1 nm.
- Manipulation of nanoparticles is difficult to achieve and requires an assortment of tools which are difficult to master. It is known, for example, that one or more particles in the micro region of about 10 "6 m may be captured and manipulated using a holographic technique which employs a Dynamic Optical Element (DOE) to produce a hologram.
- the DOE may be a spatial light modulator (SLM) to modulate a laser beam.
- the DOE may also be a digital light processor(DLP), or a fixed exposure holographic plate mounted on a spinning stage or the like. Rather than trapping one microparticle at a time, the DOE produces a plurality of beamlets for trapping a plurality of microparticles. It is likewise known that nanoparticles may be optically trapped using a holographic laser techniques. However, it has been extremely difficult to optically trap most nanoparticles and the difficulty extends Wholographic techniques as well. [00084] The reason for this difficulty is that microparticles, i.e. particles larger than 10 "6 m are usually trapped in a regime known as the Ray Optics regime. In this regime, the particle is generally much larger than the beam diameter.
- DLP digital light processor
- the difference is not simply a matter of scale. To draw a rough analogy, the difference is like using a flashlight in a darkened room to locate a basket ball versus a dust particle. Other comparisons may be made, but the important thing is that the difference in size is sufficiently great that known techniques for the micro regime are not readily adapted or practical for the nano regime without significant modifications. However, as hereinafter discussed, it is possible to employ known apparatus using new methods to achieve desired results in the nanoregion. [00085] As used herein the term manipulation broadly covers any technique where a nanoparticle is affected by incident energy. This includes trapping, moving, dislodging, heating, ablating, or the like.
- FIG. 1 illustrates the component view of one embodiment of a compact system consistent with the present invention for forming one or more optical traps.
- the system includes a phase patterning optical element 51 comparing a dynamic optical element, with a reflective, dynamic surface.
- An exemplary device is a phase only spatial light modulator such as the "PAL-SLM series X7665,” manufactured by Hamamatsu of Japan, the "SLM 512SA7” or the “SLM 512SA15” both manufactured by Boulder Nonlinear Systems of LaFayette, Colorado.
- DOE is Texas Instruments digital light processor (DLP) employing micromirrors. These dynamic optical elements have an encodable reflective surface in which a computer controls a hologram formed herein.
- the optical element 51 is aligned with, or attached to, a housing 52 through which a first light channel 53a is provided.
- i#cal element 51 , the other encrwac o ⁇ xne first light channel intersects with and communicates with a second light channel 53d formed perpendicular thereto.
- the second light channel is formed within a base 54a of a microscope lens mounting turret or "nosepiece" 54b.
- the nosepiece 54b is adapted to fit into a Nixon TE 200 series microscope (not shown).
- the second light channel communicates with a third light channel 55a which is also perpendicular to the second light channel.
- the third light channel 55a traverses from the top surface of the nosepieces 54b through the base of the nosepieces 54a and is parallel to an objective lens focusing lens 56.
- the focusing lens has a top and a bottom forming a back aperture 57.
- a dichroic mirror beam splitter 58 Interposed in the third light channel between the second light channel and the back aperture 57 of the focusing lens is a dichroic mirror beam splitter 58.
- Other components within the compact system for forming the optical traps 50 include a first mirror M1 , which reflects the beamlets emanating from the phase patterning optical element through the first light channel, a first set of transfer optics T01 disposed within the first light channel, aligned to receive the beamlets reflected by the first mirror M1 , a second set of transfer optics T02 disposed within the first light channel, aligned to receive the beamlets passing through the first set of transfer lenses T01 , and a second mirror M2, positioned at the intersection of the first light channel and the second light channel, aligned to reflect beamlets passing through the second set of transfer optics T02 and through the third light channel 55a.
- a laser beam (not shown) is directed through an optical 150 out a collimator end 151 and reflected off the dynamic surface 59 of the optical element 51.
- the beam of light (not shown) exiting the collimator end 151 of the optical fiber 150 is diffracted by the dynamic surface 59 of the optical element 51 into a plurality of beamlets (not shown).
- the number type and direction of each beamlet may be controlled and varied by altering the hologram encoded in the dynamic surface medium 59.
- the beamlets then reflect off the first mirror M1 through the first set of transfer-optics T01 down the first light channel 53a through the second set of transfer optics T02 to the second mirror M2; and are directed at the dichroic mirror 58 up to the back aperture 57 of the objective lens 56, are converged through the objective lens 56, thereby producing the optical gradient conditions necessary to form the optical traps. That portion of the light which is split passes through the loweHTortion of the third light channel 55b forming an optical data stream (not shown).
- FIG. 2 is an elevational view of a Nixon TE 200 series microscope into which the compact system 50 for forming the optical trap (Fig. 1) has been mounted.
- the nosepiece 54b with the attached housing 52 fits directly into the microscope via the mount (not shown) for the nosepieces 54a and 54b.
- the housing and its contents and attached optical element 51 are secured to the nosepiece 54a and 54b require few or no alternations or modifications to the remainder of the microscope.
- an illumination source 61 may be provided above the objective lens 56.
- the first and second set of transfer optics T01 and T02 are shown containing two lens elements each.
- the lenses can be either convex or concave. Different and varying types and quantity of lenses such as symmetrical air spaced singlets, symmetrical air space doublets and/or additional lenses or groups of lenses, can be chosen to achieve the image transfer from the first rnirror M1 to the second mirror M2.
- the first and second set of transfer optics are symmetrical air spaced doublets, spaced at a distance to act in combination as a telephoto lens.
- the compact system 50 shown in Fig. 1 for forming one or more optical traps is one embodiment of an optical tweezer.
- Optical tweezers provided a powerful method for controlling nanomaterials.
- holographic optical trapping enables the use of optical trapping for manipulating a large number of r nanostructres e.g. nanotubes or nanotube assemblies in these dimensions. These manipulations take advantage of holographic optical trapping, for example, the creation of modes of light beyond standard Gaussian traps, to control nanostructures including nanotubes in a variety of useful ways.
- optical vortices In addition to standard Gaussian optical traps, modes of light such as optical vortices may be employed to rotate structures. Optical vortices are also useful for breaking up nano. Bessel beams, because of the long aspect ratio of their trapping " re ' gfbfi, Ma 'y ⁇ ' ei ⁇ ptc ⁇ fP&p ⁇ nany nanostructures such as na ⁇ ofibers, or long single fibers. [00094] The manipulation of these nanos with optical tweezers may be augmented " by cutting or welding technologies that join or sever nanos. For example, the -tweezing laser may be appropriately employed for this purpose, or a secondary laser may be used.
- nano-based materials For example, nanotubes may be assembled to form materials, or the nanotubes in existing materials may be processed by the holographic optical tweezers, in order to adjust, for example, their position or orientation.
- a particular example of this technology is in the area of solar cells. Many new solar cell materials involve nanotubes.
- a huge barrier in creating efficient materials has been the ability to align the nanotubes during the creation of the material. Holographic optical trapping provides this capability.
- holographic optical tweezers An important application for holographic optical tweezers is for sorting nanotubes. This sorting process is critical at two stages of nano processing. The first stage involves the purification of the nano (removing "non-tube" material). Holographic optical trapping is adept at sorting materials based on size and consistency, and may be employed for this sorting stage. The second stage involves sorting nano based on their properties, for example sorting conducting from semiconducting nanotubes. This separation has been traditionally extremely difficult because the nanotubes can be extremely similar in make-up, size, and shape, except for the chirality of the'nanotube structure. The interaction with light in holographic optical traps provides a useful method for sorting based on this chirality.
- optical vortices may be employed, because they impart varying amount of momentum to different chiral structures.
- Gaussian or Bessel beam traps may be used for sorting based on conductivity.
- Bessel traps have a characteristic light distribution in the form of a hollow cylinder i.e., the region inside the cylinder is essentially dark because the light forming the trap destructively interferes, whereas the light on the surface constructively interferes.
- the light distribution in a Bessel trap varies such that elongated object may be captured within the trap and manipulated accordingly.
- a Bessel trap is sometimes referred to an optical bottle.
- a Gaussian trap has a characteristic light distribution that varies as a Gaussian function, that is the light falls off on each side of a maximum. It is also possible to produce a Gaussian-like distribution having two peaks in certain applications.
- Optical traps may be used to manipulate particles with a variety of shapes, sizes, and consistencies. Metals of various sizes have been optically trapped. Optical trapping systems involving beams coming from just one direction involve balance of forces in the direction of propagation of the .beam. The trapping force tends to pull the particle toward the focus of the trap, the radiation pressure tends to force the particle back and out of the trap. A good trap will trap the particle just slightly downstream from the focal point of the trap. However, by intentionally allowing radiation pressure to dominate particles may be guided in a stream by the laser trap and directed toward the surface of a material. These particles and surfaces are chosen so that particles may be deposited on the surface in a desired pattern. For example, nano sized gold particles may be deposited in a pattern. An annealing step may be utilized to modify properties of the pattern, such as its connectivity.
- FIG. 3A shows a dispersion of exemplary single-walled nanotubes in water with .5% solutions of SDS surfactant to stabilize the nanotubes. Dark field microscopy is sued to image the tubes.
- FIG. 3B shows a group of these nanotubes that have been aggregated with a photoconvective trap.
- FIG. 3D shows the burst of intense light that saturates the CCD camera when depositing the tubes onto the substrate.
- FIG. 3E shows the nanotubes deposited onto the substrate.
- FIG. 3C shows a time average of several frames that indicate the ability to move the trapped nanotubes (before they have been deposited) in a pre-determined pattern with the holographic optical traps.
- FIG. 3F is a bright-field image which shows the deposition of the nanotubes in a particular pattern.
- FIGs. 3G through 31 are dark field images showing the extraction of a nanotube rope from a bundle of nanotubes.
- FIG. 3K is a time average of several frames showing the rotation pattern.
- FIG. 3L shows multiple patterns produced in parallel by the optical trapping system of FIG. 1 via holographic etching with the lasers on a sheet of nanotubes deposited on a glass surface substrate.
- ABLATING GOLD ELECTRODES Holographic. optical tweezersmay be used to ablate coatings from surfaces. For example, gold maybe removed in order to generate patterns. Furthermore, the tweezers maybe used to remove material from an existing pattern, creating finer features than may be otherwise possible. For example, electrodes may be etched to make electrodes with much smaller features, enabling measurements that would otherwise be impossible. PARALLEL ABLATION MICROPROCESSING OF VARIOUS MATERIALS [000117] Microfluidic chips are growing in importance, especially for lab-on-a-chip applications. Driving such chips with holographic optical tweezers makes possible complex control of valves, pumps, syringes, and other features necessary for accurate control of chip functionality.
- laser ablation of plastic may be used for creation of microfluidic channels.
- Clear plastic is used to form a thin ( ⁇ 400 micron) sheet on a glass slide.
- the plastic either absorbs light from the laser, in which case melting by the beam is used to clear material, or is ablated by the laser, in which case channels are formed by etching away material.
- a holographic optical tweezer system is employed to create multiple, independently controllable, three-dimensional spots of light for processing the substrate. The spots are moved across the substrate, removing material and forming multiple channels simultaneously. The advantages of using a holographic optical tweezer system are many. Multiple channels may be written simultaneously, reducing manufacturing time. Because the beams are steerable, moving the microscope stage is unnecessary!
- HOLOGRAPHICALLY GENERATED CONFIGURABLE GOLD WIRES [000118] Holographic Optical Trapping makes possible the manipulation of gold nanoparticles with laser beams.
- Holographic optical tweezers may define time dependent, point like positions in. a three dimensional region.
- the points defined are separate volumes of light intensity that preferentially attract (or hold) or, alternatively, repel (or exclude), objects at or near these points.
- this light forms an array of preferential locations in space.
- Time dependent control of these points allows a moving array of preferential locations where each individual location may contain one or more objects of differing sizes, shapes or composition.
- individual points or collections of points may be turned on and off, thereby making array locations appear and disappear in time.
- This invention is an extension to forming time dependent arrays in space, and it comprises forming connections of various types between array locations.
- forms of light that provide one dimensional rather than point like light intensity regions (e.g. Bessel Beam")
- a network structure of interconnected points may be formed in a three dimensional region.
- This network structure may be time dependent, that is, connections between particular points may be turned on and off at various times or moved. Such movement may track the movement of .a collection of points defined by either an array such as the on a described above or points defined in some other way.
- objects may be fixed in space using some other mechanism.
- a new array may be formed either superimposed on an array of points as set forth above, or one that is formed completely independently of only by the endpoints ofTRe two dimensional structures of light formed.
- An example of such a network structure is the concentration of conducting nanoparticles (e.g., gold particles) that would form into conducting networks (or "wires") created by the. presence of one dimensional networks of light intensity maxima projected into a solution of conducting particles whose average size is on the order of, or smaller than, the skin depth of the particle at the wavelength of the light forming the network.
- conducting nanoparticles e.g., gold particles
- the network of light described in the previous example creates linear connections of the first type of particle, and along the sae linear network, wires of exclusion of the second type of particle. If the larger and smaller particles have different conductivities, varying the degree of attraction and repulsion of the two types of particles would result in a network of varying resistances between the endpoints of the linear structures (the array "points"). In this way, variable resistances maybe obtained throughout the network structure.
- An inventive extension of this idea is to form connections between collections of closed one dimensional structures by creating surfaces of light.
- Light may be used as the energy source for tail removal, destruction, ablation, or killing mentioned above.
- Beams of light, with widely varying and controlled, power and spatialdistributions may be applied to material through both scanning and by focusing mechanisms. These beams may remove, cut, sculpt or kill in precise fashion. As discussed below, the effect will be referred to as sculpting the sample.
- An implementation uses a galvo-driven mirror to move a pulsed beam from one ar ⁇ a ,b to anothef-w'h ' ere removal, destruction or killing is desired to occur.
- An exemplary implementation is one in which a controlled array of alternatively reflective (or absorbing) and transmissive material is placed above the sample to be affected by the light.
- an array are a MEMS mirror array and-a phase array passing; only one polarization of light.
- the system is off.
- Selectively turning on elements of the array turns on the sculpting effect in a time and spatially dependent way. Both continued sculpting of one sample may he effected.
- one or more sculpting patterns may be imposed on samples moving past the array. Feedback between measurement systems and the sculpting tool nay be used to impose sample dependent sculpting patterns on the samples.
- This system may be implemented with either a pulsed or continuous source of light.
- One or more beams of light may be used to illuminate the controlled array and thereby brovide the sculpting power.
- one or more diffractive optical elements may be used to create beams for each element of the controlled array. If the diffractive optical element or elements are dynamic, such as in the case of a SLM, the diffractive optical element may perform both the multiple beam creation function and controlled array function in one device.
- Another embodiment employs a single light beam directed through an acoustic optical cell (AOC). Such an arrangement may be employed to direct the light to different regions in a sample. Using a pulsed source, the light may be directed to sites on one or more samples requiring sculpting. In this way a single laser may be used to sculpt many sites in a sample region. During light pulses, where no sculpting is desired, the AOC may direct those light pulses to a beam block outside the sample region.
- AOC acoustic optical cell
- This implementation may also be effected with a continuous beam.
- a controlled beam interrupter upstream of the AOC gives the user the option of performing continuous sculpting or of turning on and off the light beam in a manner consistent with the AOC performance and the sample being sculpted.
- Feedback between measurement systems and the sculpting tool may be used to impose sample dependent sculpting patterns on the samples as well.
- THERMAL BASED TRAPPING WITH HOLOGRAPHIC OPTICAL TWEEZERS by lasers tweezers on strong absorbers are much stronger than trapping effects on even non absorbing specimens. Holographic optical tweezers allow the utilization of these thermal effects for object manipulation. Absorbing particles may first be trapped with olographically generated optical bottles.
- particles are trapped and manipulated in two dimensions by employing a chamber which has deposited on it a .layer of absorbing material which may be heated with .a pattern of lasers which generate a flow which tends to drive particles toward the center of the pattern, but only when those particles lie within a certain radius which is determined by the pattern.
- a .'fluid which absorbs in a two-photon process.
- Holographic Optical Trapping is an extremely versatile technology that has enabled a wide range of applications. Trapping with lasers, however, suffers from the fact that the forces generated by laser traps are inherently, relatively weak- However, forces generated by the thermal effects of laser traps may be quite strong. These thermal effects may be realized by introducing microscopic absorbers, such as graphite particles, into the system of interest: By embedding .”these particles into a:microfuidic channel large fluid flows may be generated, providing a source of powerful pumps. In addition, the versatility of holographic optical traps allows that these pumps be large in, number, and allows their three-dimensional positioning.
- Another embodiment of the system involves depositing absorbing patterns onto a .'surface which allow directed heating of the surface anywhere along the pattern.
- a thin coating of a material that absorbs laser radiation over the glass ufface S * ⁇ u ⁇ rfS6eTs ' ⁇ ' e igfa ⁇ d which may heat at any location, allowing flows to be designed with great precision.
- Holographic optical trapping allows a plurality of traps to be created, each of which may have variable power. This allows flows to be sculpted which move particles in arbitrary paths. Furthermore, since the traps are placed dynamically, the flows are .:easily reconfigured in time, enabling various forms of chemical processing and fluid computation.
- the calculation of the appropriate flow patterns is aided by the analogy with electrostatic fields.
- the flows in their simplest form are two dimensional, resulting either from the heating of discrete particles, patterns, or continuous surfaces: This is a pseudo two dimensionality because the flows are fundamentally convective and therefore three dimensional. However, it is useful to focus on only the layer of the flow where the heating occurs, and thereby recover .a two dimensional system. This is natural in many cases because often the particles or packets being transported are not density matched to their surrounding fluid.
- Even three dimensional flows may be sculpted by employing a fluid which absorbs the laser radiation. The ability to create three-dimensional traps makes possible heating anywhere in the three dimensional chamber.
- the heating may be localized to only the focal point of the traps, rather than cones of light in front of and behind the traps.
- Bessel beams may be used beneficially to heat in columns.
- Other modes of light may be similarly utilized.
- Thermal effects may also be used alone or in combination with optical trapping to manipulate particles.
- Holographic optical trapping may be combined with holographic optical tweezers employed for microfluidic flows. All the standard holographic optical trapping static and dynamic sorting techniques may be used to affect the particles in flows generated using the thermal technique. OPTICAL CONTROL OF MICRO FLUIDIC DEVICES
- Microfluidic chips consist of open channels, which may be filled with a fluid, which are created in a surrounding material. Frequently, the chips are planar in that all the channels lie in a plane. Such devices may be made, for example, by etching into a flat surface of a material and bonding a second flat material to its face. More complex devices may be three dimensional (3D) in the channels and do not all lie in a ft siftg ⁇ ⁇ 'plaf ⁇ ef SSSr ⁇ ⁇ d' ⁇ E ⁇ rffay be made, for example, by bonding a stack of multiple thin layers of PDMS, each of which has channels defined in them.
- 3D three dimensional
- Intrinsic peristaltic valving/pumping under pneumatic contro using a flexible material for the channel wall allows one to create neighboring air channels under pneumatic control which may be expanded to valve close a fluidic. channel. Multiple valves may be placed adjacent to each other form a peristaltic pump.
- the system should preferably be completely or almost completely closed.
- the components should preferably be fairly rigid to avoid stretching of the components which lead to very long relaxation times when pressures are changed.
- the number of control .lines scales linearly with the nutriber of inlets and outlets. Thus, it is bulky and expensive for more than only a few inlets and outlets.
- the flows in EOF are hard to control precisely.
- the surfaces should preferably be prepared in a very reproducible manner; the fluids should preferably have appropriate and controlled properties; a single chip's behavior tends to age; and multiple devices made in a similar manner often behave differently.
- slow flows ⁇ 10 um/s or 100um/s
- pressure driven :flows due to tiny variations in the fluid columns on different inlets and outlets may dominate the EOF flow.
- EOF works best for fast flows and precise control over system chemistry is important.
- Pneumatic control lines scale better than pressure driven flow and EOF due to the possibility of multiplexing.
- microfiuidic devices may be made which respond directly to light.
- One manifestation is to manufacture.pockets .of light absorbing dye in a soft material chip (eg., one made from PDMS).
- the light may be a collimated beam, focused onto the resevoir; or in another configuration.
- a second manifestation is to incorporate a light-absorbing dye into the continuous soft chip material (e.g., PDMS).
- PDMS continuous soft chip material
- a valve may be produced at any part of a channel even though extra effort or consideration may not have been given at design time.
- multilple such valves maybe coupled to produce one or more peristaltic pumps.
- this design shares many of the same benefits as the pneumatically controlled chips.
- the peristaltic pumping is locally controlled and the flow rate is given by geometry and the rate at which the light is pulsed..
- this microsyringe would be able to expel fluid with accuracy measured in 1/10,000 of a femtoliter, or tens of zeptoliters. This would facilitate experiments where only miniscule quantities of reagents are available, or where the expense of such .reagents is prohibitive.
- a series of such syringes surrounding a central chamber could be controlled by holographic tweezers in a precisely timed sequence which would make possible for the first time studies of the complex interactions between a variety of chemicals or biological molecules.
- valves that may be important are easily realized by blocking or unblocking channels with tweezed spheres.
- This lab-on-a-chip does not even need to be planar.
- the ability to tweeze in three dimensions allows for complex geometries, including stacks of chambers which may be driven simultaneously, or spherical microinjection chambers.
- Electrostatic forces between the sphere and the surrounding wall, mediated by intervening fluid may be extremely large. These forces may easily be. ' larger than the 100 or so piconewtons that an optical tweezer may exert. This means that it is important to avoid ti ' e likeiihood of such an adhesion taking place.
- a biological cell or small object needs to be altered for a particular application. This may require physical changes, such as cutting of a cell membrane or deformation of a polymer, or chemical changes, such as the introduction of a particular protein or DNA sequence into a cell.
- a method to accomplish this involves the use of a small object that essentially serves as a projectile with which to penetrate, deform, or otherwise affect a target object.
- the projectile for example a bead, is selected for its response to a short laser pulse. Projectiles within the range of 10 nanometers to 10 microns may be used for this purpose. For example, Bangs Laboratories, Inc.
- the projectile will be imparted with a large momentum when it is hit with a chosen laser pulse.
- Positioning of the projectile in a sample may be performed with an optical tweezer apparatus.
- Use of a holographic optical trapping device like the Arryx BioRyx® 200 system confers additional functionality.
- a laser pulse is focused and fired at it.
- These pulses can be generated by a laser cutter such as the MicroPoint 2203TMfrom Photonic Instruments, Inc. Both the heat generated and resulting momentum can result in various effects on the target object.
- the projectile may be used to penetrate a cell, and be used further within the cell to deliver a particular chemical or physically affect organelles and structures within the cell. This may be used in a similar manner to a gene gun, but with the ability to selectively target individual cells and without the requirement for a particular type of projectile (e.g. one made of tungsten). Alternately, the projectile may deform or cut the edge of the target object, when it is positioned near the edge. The projectile may also become embedded in the target object, or pass through it entirely. With holographic optical tweezers, any number of projectiles may be positioned, actively or passively, over a group of cells and" fired in succession, limited by the firing rate of the laser pulse and the speed with which the pulse focus can be moved.
- a particular type of projectile e.g. one made of tungsten
- FIGS. 4A and 4B illustrate a technique for manipulation of elongated nanostructures. It should be understood that the various nanomaterials including nanoparticles and nanostructures are typically suspended in a volume of liquid medium. In Fig.
- a nanotube 100 is suspended in a medium 101 illustrated as an exemplary elongated nanostructure.
- the nanotube 100 has end portions 102.
- the ends 102 are attached to colloidal spheres 104 by means of an intermediary species compatible with the nanotubes 100.
- the intermediary species 104 may be an industrial polymer or a bio-polymer.
- the colloidal sphere 104 may be appropriately functionalized so as to be compatible with the intermediary species.
- optical traps 108 may be employed as optical tweezers to tweeze the individual colloidal spheres 104 and to move the spheres in various directions independently. For example, in Fig.
- FIGS. 5A and 5B illustrate an arrangement similar to the previous illustration, except that in this arrangement nanoparticles 1 0 are suspended in a liquid medium 101 with the nanotubes 100.
- the ends 102 of the tubes 100 are targeted and captured in optical traps 112 along with the nanoparticles 111 , such that the nanoparticles 110 coalesce or clump ⁇ about the ends 102 to form nanohandles 110' which facilitate the manipulation of the tube.
- FIG. 6 Tll ⁇ s rates w" ar ⁇ arrangement in which different nanostructures 120A and 120B are located in a common medium.
- the structures may be nanotubes of various lengths or other structures having sensible properties.
- the property of interest is the length of the nanostructures 120A and 120B.
- Nanostructure 120A having the length la is captured by a pair of spaced apart optical traps 122A. The spacing corresponds to the length of the nanoparticle 120A.
- nanoparticle or structure 120B having the length LB is captured by a pair of appropriate spaced apart optical traps 122B.
- the length or shape of the traps makes it possible to differentiate between the nanostructures of different lengths, so ⁇ that they may be separated by capturing them and moving them to separate locations.
- FIG. 6B illustrates a multi-component nanostructure
- An exemplary structure could be, for example, a DNA molecule 130, which may be separated into separate strands 130A and 130B by securing the corresponding end 132A and 132B of each respective strand by an optical trap 134A and 134B and moving the traps apart as shown. " The pull force of the traps separates the strands and overcomes base pair bonds 133.
- Figure 7A illustrates technique whereby a nanostructure such as nanotube 140 has its end 142 captured in the optical trap 144.
- a captured end of the tube 140 may be manipulated so that the end 142 is secured to a compatible surface 146.
- one or more nanotubes may be secured or deposited on the surface in parallel axial ' alignment normal to the surface and with the free ends thereof separated from the surface 146 as illustrated.
- both ends 142A - 142B of the nanotubes 140 may be captured in a corresponding optical trap 144A - 144B and the ends may be manipulated so that each tube is attached to deposited on the substrate 146.
- the tubes are arranged in a symmetrical pattern in parallel axial alignment in the plane of the surface 146.
- nanomaterial comprising clumps of elemental gold may be deposited in ii ⁇ es forming extremely thin gold conductors.
- Gold . nanoparticles 150 may be trapped in optical trap 152 and transported for deposition to the 'l s ⁇ JrJstrate ; -i54*ffl : a 1 'S ⁇ &t r ed pattern 156 (Fig. 8B).
- a pattern 158 may be modified or refined.
- the pattern 158 which may be produced as described above or by other processes such as photolithography has an artifact 158A.
- the artifact may be attached to the pattern or may be located somewhere close to the pattern.
- the artifact may be removed by employing optical trapping techniques to ablate or remove the artifact from the surface 154.
- an electrode 160 is deposited on substrate 162. The electrode is in the form of a rectangle.
- the electrode is etched or ablated along the line 164 to electrically separate the electrode 160 into areas 160A and 160B.
- nanoparticles, microparticles, picoparticles or other objects may be inserted into or attached to other objects.
- a cell 1 0 has a cell wall or membrane 172.
- Nanoparticle for example, a gene 174 is positioned adjacent to the wall 172 by an optical trap 176.
- an energetic beam of light 178 for example a laser beam
- a laser beam may be employed to target the gene 174 (or other polymer or particle of DNA or RNA) adjacent to the cell wall 172.
- the beam pressure imbeds the gene 174 into the cell wall 172, (Fig. 9B), or if the beam pressure is increased sufficiently, the beam forms an aperture 180 in the cell wall 172 transporting the gene 176 to the interior 182 of the cell (Fig. 9C).
- trap 176 may be used to move the particle 174 into position.
- Figs. 9D - 9F illustrate an embodiment of the invention for piercing or cutting the cell wall 172.
- one or more nanobubbles 180 are generated in a volume of fluid 181.
- the bubbles 180 may be generated by a source 184 such as an ultrasonic source or a heater.
- Nanobubble 186 may be optically trapped and held in position adjacent to the cell membrane 172 by trap 187.
- An acoustic source 188 provided in the fluid medium 181 produces when activated, a shock front 189 in the medium (Fig. 9E).
- the acoustic front 189 deforms the trapped nanobubble and produces a proboscis 190 in the bubble wall, which pierces the cell membrane 172.
- FIGS. 10A - 10D illustrates a technique where channels or other nano features may be formed on and in the surface of an object 193.
- An energetic beam of laser light 194 is directed at the surface 195 of the object 193.
- the beam 193 dislodges loosely bonded particles or with higher energy etches the surface 192 forming nanochannels 196 therein (Figs. 10A - 10B).
- FIGS. 11A - 11 B illustrates a nanodevice 210 for delivering nano quantity of reagent to a downstream location.
- the device 210 comprises a block material 212 having a channel 214 formed therein.
- a nanosphere 216, sized to fit within the nanochannel 214, may be captured in trap 216 and located in the channel 214 along with a quantity of reagent 218 (Fig. 11 B).
- Nanosphere 216 may be optically trapped within the channel 216 and moved back and forth therein in the direction of the arrow.
- Nanochannel 214 having a length L and a diameter D defines a volume. By moving the sphere over length I in the nanochannel 214, a measured amount of reagent 218 may be displaced.
- Such a device is capable of delivering extremely small quantities of reagent (e.g. zepto liter).
- FIGS 12A - 12C. illustrate another embodiment of the invention, wherein nanoparticles 130 may be deposited by optical trapping on surface 132 within a space 134 containing a fluid medium 136. The nanoparticles may be patterned.
- the nanoparticles are disposed in a 4 x4 pattern 138. If the particles 130 are thermal absorbers (i.e. the particles absorb energy preferentially to the medium) then by selectively illuminating the particles in the pattern with a laser beam or trap 140, various flow patterns may be set up in the medium.
- thermal absorbers i.e. the particles absorb energy preferentially to the medium
- various flow patterns may be set up in the medium.
- particle 130 is illuminated by optical trap 140.
- the particle absorbs energy heating the adjacent medium 136 and causes convective flow 142 therein.
- medium 136 may have other nanoparticles 142 dispersed therein. These may also be attracted to the trap 140 by the light or by the fluid flow or both. By varying the energy supply to the trap, desired convective and particie flows may be established. It may also be possible to trap suspended particles with anotheftfep 14 ⁇ ' R l C)wmfe s ⁇ fafrttaining circulation of the fluid w ⁇ hin the volume.
- Figure 12C illustrates flow control in a three dimensional arrangement. A pattern of traps 160 is established in a volume 162 of medium 164. The particles 160 may be located in selected positions by traps 166.
- a particle 160 may be trapped in a Bessel trap 172 (optical bottle), the interior in which is relatively cool. If a point trap 174 is superimposed on the Bessel trap, the interior becomes illuminated and the particle 170 may absorb energy and produce fluid flow independent of the Bessel trap or bottle.
- FIG. 13A schematically illustrates a lab on chip 180 having chambers 182A - 182D interconnected by channels 184A - 184C.
- Flow patterns may be established to move fluid and particles within the chambers sequentially among various chambers 182A - 182D.
- Optical trap 186 may employed to trap particles and move the particles variously among the chambers.
- thermal flows such as described in Fig. 12 B, may be established within the one more the various chambers causing flow patterns among the chambers.
- Figure 13C illustrates a block 190 having chambers 192 and 194 therein.
- the chambers 182 and 184 are connected by a channel 196.
- Flow occurs between chambers via the channel.
- the material forming the block 180 may be a resilient polymer material such as PDMS having absorbent nanoparticles 198 dispersed therein. If the nanoparticles in the region 200 adjacent to the channel 196 are targeted by an optical trap 202, the particles absorb energy and causing the material in the vicinity Ot ⁇ eA ⁇ a ⁇ el ⁇ o ' expaT ⁇ d i , thereby causing the channel to close (Fig. 13C) When the trap is off, the material cools and the channel 196 opens. [000172] FIG.
- FIG. 13D illustrates an arrangement where a channel 204 formed In ' a body 206 has multiple feeds 208A - 208D. Each feed and channel may be targeted - by a trap 209 whereby the traps may be selectively applied.
- FIG. 13E illustrates an arrangement where a channel 210 is formed in body 211 Traps 212A - 212C are applied selectively at locations 214A - 214C. If the traps are activated in sequence, (e.g., 212A... 212B... 212C... 212A...) the channel 200 walls close in a corresponding sequence at locations 214A... 214B... 214C... 214A).
- FIGS 13A - 13E it is also possible to pulse the laser in the region of the channel to cause pumping action in the channel. For example, if one or more trap locations are established along the channel, periodically turning the laser trap on and off causes fluctuation in the pressure within the channel, which when combined with upstream or downstream pulsation, peristaltic pumping may be achieved.
- Figure 14A illustrates another embodiment of the invention in which a volume 230 of fluid media 232 contains a concentration of nanoparticles 234 suspended therein.
- Surfaces 236 and 236' are formed with corresponding contacts A, B, C, and A', B', C.
- An optical trap such as a Bessel beam 238 is established between contacts A and C.
- nanoparticles 234 collect and agglomerate along the path 240 interconnecting contacts A and C as shown.
- the Bessel beam 244 generates conductive path 248.
- the path 248 connects contacts B and A'. Bessel beams may be selectively activated and deactivated whereby various other conductive paths may be established between the surfaces.
- FIG. 14C illustrates an embodiment of the invention in which the fluid medium 250 contains two types of nanoparticles 252 and 254.
- the particles 252 have a selected conductivity, different than the conductivity of. the naiioparticles 254.
- Bessel beam 256 may be adapted to attract conductive particles 252, forming a conductive path 260 between contact points A and A'.
- Bessel beam 261 may be adapted to attract nanoparticles 254 based upon conductivity size, chirality, or other feature, so as to establish a path 262- betwe l eri b ⁇ d ! ntacf , pr6i !
- ri ⁇ s' ' a ⁇ d'BTl ⁇ fe conductivity of paths 260 and 262 may differ accordance with the respective conductivity of the nanoparticles.
- conductive paths 264 and 264' may be established between contacts A-B and A' - B' respectively.
- the conductive paths 260, 264 . together establish a conductive path through the medium. and between the surfaces which manifests itself and as a combined parallel resistance.
- Bessel beams 268 and 270 may be configured to produce conductive paths 272 and 274.
- the conductive path 272 may be formed of the lower resistance nanoparticles, and the conductive path 274 may be formed of a less conductive nanoparticles, thereby forming a series resistance.
- the respective lengths LA and LB of the respective conductive paths 272 and 274 may be varied as to establish a variable resistance between the surfaces.
- Fig. 14F illustrates a switchable wire 280 comprising a plurality of nanoconductors 282A - 282G.
- the conductors are trapped in Bessel beam 264 in sufficient proximity to support a current .
- the Bessel beam is off and one or more of the nanoconductors, e.g. 282D diffuses thereby causing the circuit to open.
- the current in this example is open and the current is zero. If the beam is switched back on the conductor 282D is pulled into proximity thereby allowing the current to flow.
- the Bessel beam 284 may be left on, and nanoconductor 282D may be switched by point trap 288 between the proximate position within the beam, as shown, where the current is on; and the position, shown in phantom line, outside the beam where the current is zero.
- Fig. 15 illustrates an exemplary embodiment of the invention in which the method is exemplified.
- nanoparticles are trapped and manipulated using a holographic technique hereinabove described.
- the implementation of the invention is not achieved simply by assembling the equipment ' described.
- DOE Dynamic Optical Element
- SLM spatial light modulator
- DLP digital light processor
- the present invention has been described using an exemplary DOE ⁇ modulated laser beam for producing the optical trap.
- other f ⁇ Yms ⁇ f eteclromagnetic energy may be used to effect trapping.
- optical tweezers are created using light generated with a laser, and which is focused by a lens to a diffraction-limited or near diffraction-limited spot.
- lasers are not essential for the process of optical trapping.
- manipulation of matter may be realized by more general distributions of electromagnetic energy and maybe, generated by implementations more diverse than the laser.
- the standard applications of optical trapping such as quickly moving an object to a desired location, or holding a particular object at a particular location, has focused attention traditional methods of generating optical traps.
- interest in generating bulk sorting of material and other novel applications of light-based manipulation of matter has made it clear that other implementations exist, and may in fact be preferable in certain cases.
- GRADED LIGHT [000184]
- the light used in optical trapping typically has the following properties: [000185] 1 ) The light is generated by a coherent laser. [000186] 2) The light is highly focused (usually approaching the diffraction limit for lenses and apertures typical of a visible light research microscope. [000187] 3) The light is generated by a continuous wave laser, rather than a pulsed laser. [000188] 4) The light is generated by a laser and is therefore highly collimated. [000189] 5) The light is generated by a laser and has high energy density compared to non-laser light sources.
- the desired light gradients may be generated in a variety of ways. Non- uniform distribution of light sources, graded filters which absorb portions of the incident light, and graded media which absorb light may be utilized. [000f92 Optic&r ⁇ ra * pp g ' radif ⁇ d ' ria ⁇ y performed with large intensity gradients in electromagnetic fields are usually achieved by focusing laser light down to diffraction-limited spots. However, gradients in the index of refraction or other parameters in the scattering or gradient terms associated with the interaction of light with matter also create forces on matter. This means that in situations where there are no electromagnetic field gradients present, matter may still be manipulated. In addition, even when gradients are present, matter manipulation may be augmented by gradients in these other parameters.
- Parameters such as radius and index of refraction are useful examples. Because it may be substantially easier to create large gradients in these parameters, or because the gradients may be much larger- than the electromagnetic field gradient, trapping maybe greatly augmented. Furthermore, although an electromagnetic field is required to produce the manipulation effect, this field may also take the form of an electric or magnetic field. [000193] A particular embodiment of this is spectral gradient trapping. Different materials possess different indices of refraction, and their indices of refraction change in different ways over the frequency spectrum. As a result, the index mismatch between two materials varies depending on the frequency of light at which one is measuring.
- a gradient may be created with a simple diffraction grating or prism. Depending on the positioning of these devices, they themselves, or a filter with an attenuation gradient, may be used to create an overall light intensity gradient to oppose the gradients dependent on wavelength.
- Figs. 16A-16G illustrate the principle of non-uniform iiiumination.
- beam 300 has a Gaussian distribution of a beam intensity.
- An electric field is produced in the particle 302 at different points P1 and P2 in accordance with the intensity of the beam.
- the electric field E1 is greater than the electric field E2 at P2.
- the particle tends to move in the direction of the arrow towards the region of maximum light intensity.
- Fig. 16B the principle is illustrated by utilizing beams 304-306 having different wavelengths or energy.
- the green beam having a wavelength L1 impinges on the particle 302 and produces a resulting trapping force.
- the red beam 306 having wave length L2 impinges on the particle and likewise results in a trapping force.
- the green beam has a lower wavelength, and hence higher energy than the red beam.
- the particle 302 tends to move in the direction of the higher energy beam as illustrated.
- the light need not be a coherent laser source but may be simply a highly focused beam of conventional radiation.
- a beam of white light 308 is directed at a prism 310 which refracts the light causing it to form a spectral display 312 of the various wavelengths making up the source.
- the particle 302 tends to move from the region of longer wavelength (red) to the region of shorter wavelength and higher energy (violet).
- the light 308 is diffracted to a spectrum by means of a defraction grading 314.
- a uniform source of light 316 is directed at a trapping space 318 filled with a medium 320 having a graded index of refraction.
- the region N1 has a higher index of refraction than the region N2.
- the particle 302 tends to move from the lower index region to the higher index region as illustrated.
- a graded density filter is disposed between a uniform and intensity beam 316 and the particle 302. According to the invention, the particle tends to move from the region of highest density D2 (lower intensity light) to the region of low density D1 or high intensity light.
- Fig. 16G illustrates an arrangement wherein the particle may be trapped using a variety of light sources.
- a continuous wave laser is employed to generate optical traps.
- a pulsed 324 laser is employed.
- the particle 302 may move be moved or trapped in accordance with variations in the intensity 326, the frequency 328 or the pulse width 330 of the laser output. As illustrated, one or more of the frequency intensity and pulsewidth may be varied to effect trapping under various conditions.
- PARK FIELD CONTRAST ENHANCEMENT [000202]
- an adapter for improving dark field (high contrast) imaging is provided.
- the present invention allows for greatly enhanced tweezing while using dark field imaging.
- Imaging nanoscale objects (lOnm to 200nm) on an optical microscope system is generally done using dark field microscopy or fluorescent microscopy.
- Dark field microscopy allows one to see the scattered light from an object on a dark background.
- a conventional high-NA dark field arrangement sends in high-NA-only illumination and requires one to reduce the NA of the objective substantially to reject unscattered illumination light. It also requires one to use special expensive objectives and condensers at the front end of the objective. Thus, it is inconvenient and time consuming to switch between dark field and other imaging (phase, fluorescent, bright field, DIC, and the like).
- tweezing ability may be substantially diminished using high-NA dark field because the objective NA must be reduced.
- the NA can be reduced to about 1.1., but in practice one generally must reduce it to about 0.9. ).
- this reduction in NA and thus in tweezing ability should be avoided.
- Fluorescent microscopy allows one to see very small objects, but only if an appropriate fluorescent dye is available and has been used. While fluorescent imaging offers greater promise than, dark field, it is not suitable or possible for certain applications, and in general it is more costly and time consuming. On some systems, fluorescent microscopy is practically not possible because most dyes are excited strongly and photobleached by the 532nm tweezer light.
- the invention is a Low-NA Dark Field Adapter that will allow one to do dark field imaging with a standard low NA condenser on conventional microscopes with minimal effort or reconfiguring of the system, and at a lesser cost than the conventional high-NA dark field solution mentioned above.
- the arrangement achieves this by blocking the low NA illumination light as it leaves the back aperture of the objective. It may be used with a high NA objective without reducing tweezing ability because it only blocks the low angle rays.
- the arrangement discussed below blocks out a disk of light at the back aperture of the objective, where the disk size is determined by the back aperture size of the objective and the maximum ray angle desired to pass. For a 60X high NA oil objective, this is roughly 7mm.
- an output mask 336 is disposed at the output 338 of an objective 340.
- the mask 336 blocks low angle output light 342 in the central region and allows wide angle output light 344 to pass. The reduction in the output light results in improved contrast.
- the optic 340 should be lambda/10 or lambda/20 in flatness to avoid distortion of tweezer wavefrom. It may have a broadband AR coating on both surfaces for the visible. For an IR system, it should also transmit well at 1064nm.
- the mask 336 should be absorbing. Optionally, screws may be used to align and hold the mask in the center.
- the optic may be held in a ring 344 and secured in place with RTV or in a web 346.
- These devices may improve imaging of nanoscale objects by allowing dark field microscopy to be done more quickly and flexibly than currently possible, and at lesser cost than the conventional method.
- a low-NA dark field device according to the invention may substantially improve capability to manipulate nanoscale objects, as it simultaneously improves tweezing and imaging of nanoscale objects.
- the conventional dark field solution substantially decreases trapping ability by reducing the NA of the objective.
- the potential low cost of this arrangement compared to the conventional arrangement, may make it attractive to any person working with high NA objectives and small objects.
- TEM00 beams i.e., the standard Gaussian profile beam
- other beam profiles often perform much better.
- a TEM01 beam has a donut-like cross-section. This beam often performs better than a TEM00 beam for laser tweezing,
- a further optimized beam profile so called is the "Ring Mode".
- a ring mode beam has a flat profile near the edges, and abruptly drops to zero intensity inside and outside certain radii.
- the ring mode has the same advantages as a TEM01 , but for appropriately chosen radii, can substantially outperform the TEM01 beam.
- the phase front of a TEM00 beam is modified, such as with an SLM, such as to allow one to produce TEM01 and ring mode beams, as well as other modes.
- SLM phase front of a TEM00 beam
- much greater performance and optimization may be achieved by using a dynamically configurable beam profile, such as that provided by a computer-driven SLMs. Because different objects respond differently to different beam modes, there is a huge-advantage to being able to easily and continuously vary the beam mode to produce optimal tweezing performance for a given, size, shape, or material of object of interest.
- ring mode beams may be produced with an SLM 150 by using the area 152 inside the inner part of the ring and the area 154 outside the outer part of the ring to encode a simple mirror which deflects the light to a place where it does not contribute to the tweezing spot, such as into a beam stop or off to the side of the tweezing area.
- phase-oniy SLMs intensity-only SLMs, or phase-and-intensity modulating SLMS can be used for this application. Additional beam modes may be possible other than TEM01 and ring modes.
- TEMO0 mode of a smaller diameter, or simple a "Disk Mode”.
- Figs. 18A-B illustrate an example wherein the SLM 150 is configured in an optical train.
- the SLM 150 in addition to the imaging hologram, may be configured with reflective (mirror) 154 in the outer margin.
- the central region has a central spot blocking mirror 152. These regions may be used to block the central spot and traps to higher order diffraction zones. They may also be used as beam blocks when doing beam shaping as discussed above.
- any physically realized optical system will have defects in the manufacture and alignment of the optics.
- the tolerance for these defects is very small and the performance of the optical tweezers is strongly determined by how precisely the optics are made and aligned. 2 PHOTON FOCUSING
- the invention uses, as its metric, a 2-photon reactive material as a non-linear device to report the overall quality of the optical system.
- an SLM is used to correct for aberrations introduced by the physical optics.
- of an optical tweezing system is to focus light as tightly as possible in three dimensions. Due to the very small size of the tweezing spot, it is very difficult to directly measure how tightly the light is focused.
- This invention employs a material which responds to the light with an amplitude which increases faster non linearly with the light intensity.
- a phase-only SLM may be employed to modify the wavefront to correct for aberrations introduced by the optics.
- the metric will be most reliable if the fluorescing light is taken from the focal plane. A relatively large focal depth may degrade the reliability of the metric. A high NA objective limits the focal depth. Beam stops or pinholes, analogous to confocal microscopy may be used as well.
- a thin material for the metric may result in a response representing the beam tightness accurately.
- the SLM itself may introduce optical defects into the beam.
- the mirror surface used in some SLMs are polished imperfectly, leaving a bowl shape to the surface. This spreads out the tweezer spot, creating a tweezer which may be slightly or severely weaker in trapping power, depending upon the material tweezed.
- the method according to the invention provides a metric and correction system that can correct for defects in the SLM itself.
- the force a laser may exert is substantially increased for a given laser power by increasing the tightness of the iaser tweezer spot.
- the laser power may be reduced as the spot size is reduced.
- fluorescing light intensity increases with increasing tweezer tightness. Quantifying the tightness of the laser spot may be done by simultaneously measuring the amount of light in the tweezer and the tightness of the light.
- Figs. 19A-B illustrate an exemplary embodiment of the invention. In Fig.
- an abberation correction 160 may be added to the SLM hologram 150.
- the correction is determined by selecting a parameter of interest to be optimized.
- the beam spot is reduced until a 2-photon response is sensed. For example, an exitation wave L1 , produces emmission at L2, a lower energy, longer wave length. If the beam is tightly focused at 2L1 , (E1 12 ) the two photons will combine and add to excite the L1 wave causing a L2 emmission. The brighter L2 the tighter the spot.
- that parameter may be varied and the spot size may be adjusted to optimize the response at that value.
- the procedure may be followed in turn for as many parameters as desired in accordance with known sampling schemes. Values for the corrections may be added to the SLM hologram to produce a correction hologram adjusted for various defects and abberations.
- Using the method described above may allow one to optimize the tightness of the focused laser tweezer spot.
- a tightening of the laser tweezer spot may significantly increase the maximum laser tweezer force.
- this sort of optimization may be crucial.
- optimization of tweezer focus may be an essential step for achieving tweezing or manipulation.
- the tweezer wavefront may be corrected for known circumstances in the optical system using a device for phase modulation of the wavefrom. Improved tweezer performance may be obtained despite the use of sub optimal imaging components.
- Optimal imaging is typically achieved by using known high numerical aperture oil immersion objectives. The high numerical aperture produces a higher resolution. The oil eliminates the changes in index of refraction between the objective, the immersion fluid (typically air), and the cover glass.
- This design assumes the object being imaged is on the surface of the cover glass or that the fluid the object is immersed in is index matched to the glass and oil. For many systems of interest, including the vast majority of biological and colloidal systems, it is not possible or desirable to immerse the objects in such a fluid.
- an SLM may be used to modify the phase front of the beam in order to correct for the aberrations introduced by the interface between the continuous phase and other medium e.g., glass.
- Such an arrangement would allow optimal tweezing performance in many of the most commonly used applications, such as tweezing colloids, biological samples, nanotubes, and many other nanoscale objects. It would also allow much greater tweezing in three dimensional systems, such as for 3D manipulation and assembly of devices.
- While oil objectives may provide optimal achievable performance, in many real world applications, e.g.
- non-oil-immersion objectives outperform oil-immersion objectives.
- water immersion objectives are preferred, although air objectives or for a particular situation, especially if the dispersing fluid is not water (eg. laser tweezing objects in air or in glycerine).
- the dispersing medium is not index matched to the cover glass (which in some cases may actually be a plastic, sapphire, or other material)
- -An-SLM- may be-used to partially or fully correct for these defects, allowing for improved optical tweezing or optical tweezing for materials or situations which is otherwise impossible.
- the mismatch between the ideal fluid, e.g. oil, and the actual fluid, e.g. air may be calculated and added to the SLM hologram as correction.
- optical aberrations may occur. These aberrations may likewise be corrected with a phase modulating SLM, allowing for improved optical tweezing or optical tweezing for materials or situations which is otherwise impossible.
- Some aberrations introduced by optical properties of the tweezing optic, typically a microscope objective may also be corrected using an SLM if the aberrations are well characterized.
- SLMs can be used to modify the phase front of the laser tweezer to correct for the aberrations introduced in these situations, thereby allowing optimal tweezing in situations where tweezing would otherwise be diminished or impossible. This is especially valuable for tweezing biological systems, nanoscale objects, or for 3D manipulation deep inside the dispersing fluid.
- Figs. 20A-20B illustrate various sources of error.
- the lens 270 has an index NL; the first medium 272 has an index N1 ; the glass 274 has an index NG and so on. If they are matched at some ideal, no correction is required. However, if the index of medium 272 is oil, and water or air is substituted, the system will exhibit a non ideal response.
- the mismatch may be calculated and corrected and a correction may be added to the SLM to compensate for this mismatch.
- Abberations occurring for objects near or away may be calculated and added for the SLM hologram.
- the two photon focusing technique may be employed to optimize for mismatches.
- the offset between the window 274 and the location of the object in medium 276 is about 10-15uM.
- the method according to the invention allows for the practical implementation of desired manipulation of nanoparticles using a wide variety of techniques.
- the method is implemented by capturing and manipulating nanomaterial particles having one or more nanocharacteristics with an " optical traplorrned by n ⁇ ocluTating alaser beam witffdynamic " optical element (DOE).
- DOE optical traplorrned by n ⁇ ocluTating alaser beam witffdynamic " optical element (DOE).
- At least one characteristic of the nanomaterials is selected. Such characteristic may be size, conductivity, chiliarity, refrective index or the like.
- a laser beam is generated having a selected wavelength corresponding to the at least one selected characteristic of the nanomaterial.
- Calculated values for the DOE, corresponding to the at least one selected characteristic of the nanomaterial are selected.
- the beam is modulated with the DOE to produce a holographic optical trap having properties corresponding to the at least one selected characteristic.
- the trap is focused to a spot size of about V ⁇ the selected wavelength; and the beam focus is located near a particle for trapping the particle therein.
- the method is implemented in a practical way by employing the DOE as a tool to find the most useful, stable and highly functional traps. To this end, a hologram is selected. Then a trap is generated from the hologram. The resulting trap functionality is observed by the human observer or an automated observer or the like and depending on the results, a further hologram is selected. The process continues until the observer is satisfied that a sufficiently functional, stable and useful trap is produced.
- the method improves on prior art techniques in that such techniques do not use the DOE as a tool to find optimally functional and stable traps. Indeed, the potential combinations of calculations for practical holograms is a huge number with practically unlimited combinations. Accordingly, unless a high speed DOE coupled with a sufficiently powerful processor is used, it is unlikely that one could practically achieve optical trapping of nanoparticles. In the invention, however, the DOE and computer drive are used to find the characteristics for hologram calculations based on the characteristics of the nanoparticles. Prior art systems rely on trial and error by simply using known arrangements without tailoring the hologram calculations to the particle characteristics. Thus, the amount of time saved using the method of the invention has allowed for the development of many techniques for the manipulation of nanoparticles in a practical time frame.
- the invention also includes products produced in accordance with the methods and apparatus disclosed herein.
- the invention comprises products produced by manipulation of particles using a laser beam modulated by a dynamic optical element to produce an optical trap.
- the invention cdnTp ⁇ ses products produced by an apparatus for manipulating particles using such a- laser beam and modulating dynamic optical element.
- the invention comprises a structure formed by manipulating nanotubes using the methods and apparatus described and attaching the nanotubes to form such structures.
Abstract
Description
Claims
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US11/079,533 US7449679B2 (en) | 2003-10-28 | 2005-03-15 | System and method for manipulating and processing materials using holographic optical trapping |
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2005
- 2005-03-15 US US11/079,533 patent/US7449679B2/en not_active Expired - Fee Related
- 2005-03-17 EP EP05728700A patent/EP1745530A4/en not_active Withdrawn
- 2005-03-17 WO PCT/US2005/008934 patent/WO2005089437A2/en active Application Filing
- 2005-03-17 JP JP2007504114A patent/JP2007537885A/en active Pending
Non-Patent Citations (2)
Title |
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None |
See also references of EP1745530A4 |
Also Published As
Publication number | Publication date |
---|---|
WO2005089437A3 (en) | 2006-10-26 |
US20050247866A1 (en) | 2005-11-10 |
JP2007537885A (en) | 2007-12-27 |
US7449679B2 (en) | 2008-11-11 |
EP1745530A2 (en) | 2007-01-24 |
EP1745530A4 (en) | 2009-08-05 |
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