Title

Tunable diffraction grating using ultraviolet-light-induced spatial phase modulation in dual-frequency liquid crystal

Authors

Authors

P. T. Lin; X. Liang; H. W. Ren;S. T. Wu

Comments

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Abbreviated Journal Title

Appl. Phys. Lett.

Keywords

Physics, Applied

Abstract

An electrically tunable diffraction phase grating using ultraviolet (UV)-light-induced spatial dielectric modulation of a dual-frequency liquid crystal (DFLC) cell is demonstrated. A photomask with transparent and opaque stripes was used for fabricating the grating. In the UV-exposed stripes, the negative dielectric anisotropy (Deltaepsilon) tolane compound of the DFLC mixture is partially polymerized resulting in a decreased threshold voltage as compared to that of the unexposed region. Upon applying a constant voltage, the phase difference between the adjacent pixels is produced. The first-order diffraction efficiency reaches similar to60% which agrees well with the simulation results. Due to the dual-frequency addressing at 30 V-rms, the response time of the DFLC phase grating was measured to be similar to1 ms at room temperature. (C) 2004 American Institute of Physics.

Journal Title

Applied Physics Letters

Volume

85

Issue/Number

7

Publication Date

1-1-2004

Document Type

Article

Language

English

First Page

1131

Last Page

1133

WOS Identifier

WOS:000223233800013

ISSN

0003-6951

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