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Proceedings Paper

Switchable circular beamsplitter using a dual-frequency cholesteric liquid crystal
Author(s): Hong Ding; Greg A. Kopp; Michael J. Derks; Michael H. Anderson; Ming Xu; Deng Ke Yang
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Paper Abstract

The cholesteric liquid crystal (LC) has a chiral structure defined by pitch length. This unique structure reflects one handedness of circularly polarized light and is used as a circular polarizer. This polarizer can be actively switched between a state that is transparent to light of all polarizations and another state that in only transmissive to one handedness of circularly polarized light. The dual- frequency material is used to reduce the relaxation time. The dual-frequency circular polarizer can be switched from the transparent homeotropic texture by a low frequency driving signal, and switched to the reflecting planar texture by a high frequency signal. This polarizer functions as a switchable shutter for which we have characterized switching process, relaxation time, polarization purity, and extinction ratio.

Paper Details

Date Published: 14 October 1998
PDF: 10 pages
Proc. SPIE 3475, Liquid Crystals II, (14 October 1998); doi: 10.1117/12.326904
Show Author Affiliations
Hong Ding, Meadowlark Optics (United States)
Greg A. Kopp, Meadowlark Optics (United States)
Michael J. Derks, Meadowlark Optics (United States)
Michael H. Anderson, Meadowlark Optics (United States)
Ming Xu, Kent State Univ. (United States)
Deng Ke Yang, Kent State Univ. (United States)

Published in SPIE Proceedings Vol. 3475:
Liquid Crystals II
Iam-Choon Khoo, Editor(s)

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