AC electric field assisted photo-induced high efficiency orientational diffractive grating in nematic liquid crystals | Zendy

S. Liang | Zendy; WingKee Lee | Zendy; Xiaosheng Wang | Zendy

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AC electric field assisted photo-induced high efficiency orientational diffractive grating in nematic liquid crystals

Author(s) -

S. Liang,

WingKee Lee,

Xiaosheng Wang

Publication year - 2006

Publication title -

optics express

Language(s) - Uncategorized

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.14.002197

Subject(s) - liquid crystal , homeotropic alignment , electric field , optics , materials science , grating , diffraction efficiency , diffraction grating , diffraction , doping , scattering , refractive index , light scattering , condensed matter physics , optoelectronics , physics , quantum mechanics

An orientational grating with reduced scattering noise is formed in fullerene-doped and undoped homeotropic nematic liquid crystal cells by simultaneous application of both spatially modulated light and ac electric field. The first-order diffraction efficiency obtained in the fullerene-doped cell reaches ~30 %, approaching the maximum value predicted by theory. Effective nonlinear index coefficient is ~0.9 cm2/W and ~1000 times larger than previous observations in C(60)-doped nematic liquid crystals using a dc field. Grating formation time can be as short as 1 s, which is ~100 times shorter than those found by us using a dc field and previous studies.

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