Semiconductor optical device having a variable refractive index

Details Semiconductor optical device having a variable refractive index Semiconductor optical device having a variable refractive index

1991-06-18

1992-06-30

Jackson, Jr., Jerome

Optical: systems and elements

Optical modulator

Light wave directional modulation

359245, 359248, 357 16, 357 30, H01L 29165, H01L 2714, G02F 101

Patent

active

051268752

ABSTRACT:
A semiconductor optical device for focusing an optical beam includes a substrate doped to a first conductivity type, a semiconductor layer doped to a conductivity type different from that of the substrate, a recombination region formed between the substrate and the second semiconductor layer, a first electrode provided on a bottom surface of the substrate, and a second electrode provided on a top surface of the second semiconductor layer. The first electrode is transparent to the optical beam which passes freely therethrough. The second electrode is provided with a passage for the optical beam. The passage has a size which exceeds the carrier diffusion length in the semiconductor layer. A profile of refractive index is thus created in the recombination region such that the refractive index is at a minimum at the center of the circular passage and is at a maximum at an edge of the passage.

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patent: 4528418 (1985-07-01), McGill
Pankove, RCA TN No. 721, Jun. 1967, "Optical Beam Deflector".
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Soviet Inventions Illustrated, Derwent Publications Ltd., Section Electrical Week B17, Abstract No. D7823, B17, Jun. 8, 1979 & SU-A-61167 (Yashin E.M.) May 15, 1978 *the whole document*.
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