A resonant grating structure in a waveguide and methods of tuning the performance of the grating structure are described. An apparatus includes a waveguide; and a subwavelength resonant grating structure embedded in the waveguide. The systems and methods provide advantages including narrowband filtering...http://www.google.com/patents/US6035089?utm_source=gb-gplus-sharePatent US6035089 - Integrated narrowband optical filter based on embedded subwavelength resonant grating structures
