Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1994-10-19
1996-09-03
Gross, Anita Pellman
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 95, 359 96, C09K 1952, G02F 113
Patent
active
055529151
ABSTRACT:
Persistent director axis reorientation is induced in a liquid crystal film in response to a projected optical image by a method that includes the following steps: applying adc potential across the liquid crystal film; exposing the liquid crystal film to a spatially varying optical intensity which, in combination with the dc potential, produces a spatially varying dc current flow and a spatial charge field in accordance with the intensity variation of an optical image, the spatial charge field resulting in persistent refractive index changes in the liquid crystal film; and removing the dc potential and spatially varying optical intensity. To retrieve the image that is "stored" in the liquid crystal film, the liquid material is illuminated with a monochromatic optical beam. With certain liquid crystal films, reapplication of the dc potential combined, application of the optical illumination results in retrieval of the stored optical image.
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Gross Anita Pellman
Monahan Thomas J.
The Penn State Research Foundation
Ton That Toan
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