Light modulation device and method of light modulation using the same
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United States of America Patent
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Jul 1, 1997
Grant Date -
N/A
app pub date -
Nov 25, 1992
filing date -
Nov 26, 1991
priority date (Note) -
Expired
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Abstract
A light modulation device with high density, high sensitivity, and excellent stability while having a simple construction and a non-destructive memory reading method using the same are disclosed. The light modulation device comprises a high polymeric liquid crystal film comprising a uniaxially orientated side chain type high polymeric liquid crystal containing a photochromic compound, and it modulates light in the wavelength region in which the photochromic compound has no absorption by making use of a change in refractive index anisotropy of the high polymeric liquid crystal film which has been caused by photoisomerization of the photochromic compound. The device is useful as a stable and high-density optical computing device or an erasable optical memory material.
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