Spatial light modulator
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United States of America Patent
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-
Nov 10, 1987
Grant Date -
N/A
app pub date -
Nov 27, 1985
filing date -
Nov 27, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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