Optical: systems and elements – Diffraction – From grating
Reexamination Certificate
2007-02-22
2008-09-02
Wu, Shean C (Department: 1795)
Optical: systems and elements
Diffraction
From grating
C359S321000, C359S569000, C349S088000, C349S201000, C349S202000, C385S036000, C385S037000
Reexamination Certificate
active
07420733
ABSTRACT:
A new photopolymerizable material allows single-step, fast recording of volume holograms with properties that can be electrically controlled. Polymer-dispersed liquid crystals (PDLCs) in accordance with the invention preferably comprise a homogeneous mixture of a nematic liquid crystal and a multifunctional pentaacrylate monomer in combination with photoinitiator, coinitiator and cross-linking agent. Optionally, a surfactant such as octancic acid may also be added. The PDLC material is exposed to coherent light to produce an interference pattern inside the material. Photopolymerization of the new PDLC material produces a hologram of clearly separated liquid crystal domains and cured polymer domains.
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Sutherland, Richard L.
Brandelik Donna M.
Bunning Timothy J.
Epling Bob
Natarajan Lalgudi V.
Sutherland Richard L.
King & Spalding LLP
Science Applications International Corporation
Wu Shean C
LandOfFree
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