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

Pao Tai Lin | Zendy; Xiao Liang | Zendy; Hongwen Ren | Zendy; ShinTson Wu | Zendy

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

Author(s) -

Pao Tai Lin,

Xiao Liang,

Hongwen Ren,

ShinTson Wu

Publication year - 2004

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.1781752

Subject(s) - materials science , diffraction grating , optoelectronics , diffraction , grating , optics , phase modulation , diffraction efficiency , phase (matter) , modulation (music) , ultraviolet , acousto optics , liquid crystal , spatial light modulator , chemistry , physics , phase noise , organic chemistry , acoustics

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 (Δe) 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 ∼60% which agrees well with the simulation results. Due to the dual-frequency addressing at 30Vrms, the response time of the DFLC phase grating was measured to be ∼1ms at room temperature.

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