Integrated optical waveguides and methods for the production thereof which have a patterned upper cladding with a defined opening to allow at least one side or at least one end of a light transmissive element to be air clad. The at least one side or at least one end is, for preference, a lens structure...http://www.google.com/patents/US7218812?utm_source=gb-gplus-sharePatent US7218812 - Planar waveguide with patterned cladding and method for producing the same
