Liquid crystal cells – elements and systems – Liquid crystal system
Reexamination Certificate
2007-11-06
2010-06-15
Font, Frank G (Department: 2883)
Liquid crystal cells, elements and systems
Liquid crystal system
Reexamination Certificate
active
07738047
ABSTRACT:
Under one aspect, a phase contrast imaging system includes a coherent light source emitting a coherent beam directed toward a sample area; a lens arranged to collect at least part of the beam from the sample area; an element Fourier transforming the collected beam in a Fourier plane; a liquid crystal cell in the Fourier plane that transmits at least part of the transformed beam, wherein the cell includes liquid crystal molecules having a phase transition temperature, and wherein at temperatures exceeding the phase transition temperature, light transmitted through the liquid crystal molecules obtains a different phase than light transmitted through the liquid crystal molecules obtains at temperatures below the phase transition temperature; and an element inversely Fourier transforming the transmitted beam to provide an image. Part of the transformed beam has an intensity sufficient to heat a portion of the liquid crystal molecules above the phase transition temperature.
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Kothapalli Sri Rajasekhar
Rao D. V. Gopal L. N.
Yelleswarapu Chandra S.
El Shammaa Mary A
Font Frank G
University of Massachusetts
Wilmer Cutler Pickering Hale and Dorr LLP
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