Nonlinear and bistable optical device

Details Nonlinear and bistable optical device Nonlinear and bistable optical device

1987-10-06

1989-03-21

Welsh, J. David

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

377102, 372 12, 372 45, 372 46, 357 30, H01J 4014

Patent

active

RE0328936

ABSTRACT:
The invention is a nonlinear or bistable optical device having a low switching energy. The invention uses a means responsive to light for generating a photocurrent, a structure having a semiconductor quantum well region, and means responsive to the photocurrent for electrically controlling an optical absorption of the semiconductor quantum well region. The optical absorption of the semiconductor quantum well region varies in response to variations in the photocurrent. A photodiode or phototransistor may be used as the means responsive to light, and may be made integral with the structure having the semiconductor quantum well region. An array of devices may be fabricated on a single chip for parallel logic processing.

REFERENCES:
T. A. Wood, et al., "High-Speed Optical Modulation with GaAs/GaAlAs Quantum Wells in a p-i-n Diode Structure", Appl Phys. Lett. 43(1), Jan. 1, 1984, pp. 16-18.
K. Bohnert et al., "Intrinsic Absorptive Optical Bistability in CdS", App. Phys. Lett. (43(12), Dec. 15, 1983, pp. 1088-1090.
Hajto et al., "Optical Bistability Observed in Amorphous Semiconductor Films", Philos. Mag. B, 1983, 47, #4, pp. 347-366.

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