Optical waveguides
First Claim
1. An optical waveguide comprising a body of material configured for contained propagation of light therethrough, a surface relief grating configured to receive the propagating light and at least partially to diffract or reflect it out of the waveguide, and at least one layer of dielectric material applied to a surface of the surface-relief grating of a thickness that increases along the length of the waveguide in the direction of said propagation so that the grating exhibits a spatial variation in efficiency dependent on the increasing thickness of the dielectric material along the length of the waveguide.
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Accused Products
Abstract
An optical waveguide comprising a body of material configured for the contained propagation of light therethrough, a surface relief grating configured to receive the propagating light and at least partially to diffract or reflect it out of the waveguide, and at least one layer of dielectric material of varying thickness having a first surface and a second surface which conforms to a profiled surface of the grating so that the grating exhibits a spatial variation in efficiency dependent on the varying thickness of the dielectric material.
114 Citations
15 Claims
- 1. An optical waveguide comprising a body of material configured for contained propagation of light therethrough, a surface relief grating configured to receive the propagating light and at least partially to diffract or reflect it out of the waveguide, and at least one layer of dielectric material applied to a surface of the surface-relief grating of a thickness that increases along the length of the waveguide in the direction of said propagation so that the grating exhibits a spatial variation in efficiency dependent on the increasing thickness of the dielectric material along the length of the waveguide.
Specification