Multiple quantum well optical modulator

Details Multiple quantum well optical modulator Multiple quantum well optical modulator

1987-01-28

1989-04-04

LaRoche, Eugene R.

350353, G02F 119, G02F 121

Patent

active

048180793

ABSTRACT:
Multiple quantum well (MQW) structures (24) are utilized to provide real-time, reliable, high-performance, optically-addressed spatial-light modulators (SLM) (10, 10'). Several embodiments are provided, including combination of MQW structures with PIN photodiodes of GaAs (12) or Si (12') to form two-dimensional arrays of pixel elements (92) on a single chip (90). In another embodiment, the optically-addressed SLM (50) comprises a vertical stack of MQW layers (52) within the penetration depth of an optical write signal (36), a plurality of space charge barriers (52b) having predetermined tunneling times by control of doping and thickness, whereby modulation sensitivity is high and no external voltage source is required. In yet another embodiment, the optically-addressed SLM (70) comprises a multiplicity of quarter-wave layers (72, 74) whose index of refraction is changed by changes in in the fields at the boundaries (80) responsive to the photocurrent generated by the incident write signal. The changes are read by use of a read signal (38) of a wavelength that is resonantly reflected (78) from the quarter-wave layers.

REFERENCES:
patent: 4573767 (1986-03-01), Jewell
patent: 4626075 (1986-12-01), Chemla
patent: 4701030 (1987-10-01), Jewell

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