Spatial light modulator

Details Spatial light modulator Spatial light modulator

1985-11-27

1987-11-10

Arnold, Bruce Y.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

332 751, 350164, 357 16, G02F 1015

Patent

active

047053615

ABSTRACT:
A light modulator and a high speed spatial light modulator (230) with each pixel (231) made of stacked quarter wavelength layers (232, 234) of heterogeneous material. Each layer (232, 234) is composed of periodic quantum well structures whose optical constants can be strongly perturbed by bias on control electrodes (240, 242). The control electrodes (240, 242) act to either remove light absorbing electrons from the layer or to inject them into each layer. The effect is to produce either a highly relecting mirror or a highly absorbing structure. The spatial light modulator (230) is compatible with semiconductor processing technology. Also, a modulator invoking the Burstein effect in the form of a stack of p-n diodes is disclosed.

REFERENCES:
patent: 4525687 (1985-06-01), Chemla et al.

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