Optical waveguides – With optical coupler – Input/output coupler
Patent
1998-04-24
2000-02-29
Ngo, Hung N.
Optical waveguides
With optical coupler
Input/output coupler
359576, G02B 634
Patent
active
060319518
ABSTRACT:
For use over a substrate having a substrate refractive index, a diffraction grating for, and method of, converting normally incident light into horizontally propagating light inside the substrate and an optical device employing the diffraction grating or method. In one embodiment, the diffraction grating includes: (1) a first volume of a first material having a first refractive index higher than said substrate refractive index, and (2) a second volume of a second material having a second refractive index lower than the substrate refractive index, the second volume being less than the first volume.
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"Grating Coupled Infrared Modular at Normal Incidence Based on Intersubband Transitions" by J. Y. Duboz, V. Berger, N. Laurent, D. Adam and J. Nagle; Mar. 1997; pp. 1569-1571.
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"9-.mu.m Cutoff 256.times.256 GaAs/A1.sub.x --.sub.x As Quantum Well Infrared Photodetector Hand-Held Camera" by Sarath D. Gunapala, John K. Liu, Jin S. Park, Mani Sundaram, Craig A Schott, Ted Hoelter, True-Lon Lin, S. T. Massie, Paul D. Maker, Richard E. Muller and Gabby Sarusi; Jan. 1997; pp. 51-57.
"15-.mu.m 128.times.128 GaAs/A1.sub.x Gal-.sub.x As Quantum Well Infrared Photodetector Focal Plane Array Camera" by Sarath D. Gunapala, Jin S. Park, Gabby Sarusi, True-Lon Lin, John K. Liu, Paul D. Maker, Richard E. Muller, Craig A. Schott and Ted Hoelter; Jan. 1997; pp. 45-50.
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Ngo Hung N.
Rose Research L.L.C.
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