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Switchable volume hologram materials and devices

  • US 6,699,407 B1
  • Filed: 03/02/1998
  • Issued: 03/02/2004
  • Est. Priority Date: 07/12/1996
  • Status: Expired due to Term
First Claim
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1. A method for preparing an electrically switchable reflection hologram, comprising:

  • disposing a polymer-dispersed liquid crystal material between transparent plates, wherein the polymer-dispersed liquid crystal material comprising, before exposure;

    (a) a polymerizable;

    (b) a liquid crystal;

    (c) a cross-linking monomer;

    (d) a coinitiator; and

    (e) a photoinitiator dye;

    disposing the polymer-dispersed liquid crystal material within a magnetic field wherein the orientation of at least a portion of the magnetic field is directed along an axis substantially parallel to the plane of the plates; and

    exposing an interference pattern inside the polymer-dispersed liquid crystal material while the polymer-dispersed liquid crystal material is disposed within the magnetic field.

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