Diffraction grating structures
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United States of America Patent
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Jul 25, 1989
Grant Date -
N/A
app pub date -
Jul 14, 1986
filing date -
Jul 14, 1986
priority date (Note) -
Expired
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Abstract
A diffraction grating responds to incoming radiation incident thereon within a given range of incidence angles and re-directs such incident radiation from the structure in a selected direction within relatively limited confines. A liquid crystal material is positioned in contact with the diffracting surface of said at least one diffraction structure, the liquid crystal material, when inactivated, having a refractive index substantially the same as that of the diffraction structure. Activation means place the liquid crystal material in an activated state so that the refractive index thereof is substantially different from that of the diffraction structure whereby incoming radiation within a given range of incidence angles is transmitted through the structure and exits in the selected direction.
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