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US 4,227,769 AGranted
Planar optical waveguide comprising thin metal oxide film incorporating a relief phase grating
AssigneeRCA Corporation
InventorsWilliam Phillips, Clyde C. Neil, Jacob M. Hammer
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Abstract
Enhanced optical coupling by phase evanescent fields is achieved by covering the planar layer of a waveguide with a thin metal oxide film incorporating a relief phase grating. The grating is originally formed in a metallic film covering the planar layer, which metallic film is converted to a metal oxide film by heating in an oxygen-containing atmosphere.
Claims6
A planar optical waveguide comprising:
- a substrate composed of a first dielectric material exhibiting a first index of refraction,
- a planar layer composed of a second dielectric material exhibiting a second index of refraction greater than said first index of refraction said substrate supporting said planar layer,
- a metal oxide film coating said planar layer, said metal oxide film exhibiting a third index of refraction greater than said second index of refraction, and
- an optical-coupling relief phase grating incorporated on the exposed surface of said metal oxide film.
1 more element
Dependencies are inferred from the claim text.