Observation of self-diffraction by gratings in nematic liquid crystals doped with carbon nanotubes

被引：77

作者：

Lee, W ^{[1
]}

Chiu, CS ^{[1
]}

机构：

[1] Chung Yuan Christian Univ, Dept Phys, Chungli 32023, Taiwan

来源：

OPTICS LETTERS | 2001年 / 26卷 / 08期

关键词：

D O I：

10.1364/OL.26.000521

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Diffraction gratings were studied in cells of the homogeneously aligned liquid-crystal E7 doped with multiwall carbon nanotubes. These phase gratings were induced by interference modulation of two coherent optical beams, in conjunction with an applied de field that was perpendicular to the unperturbed director axis. Self-diffraction was observed at all angles of incidence of the writing beams, including normal incidence. A superior nonlinear-index coefficient of 5 x 10(-2) cm(2)/W was obtained after passage of a 44-mW/cm(2) beam through a film with a grating constant of 18 mum under an external voltage of 15 V. The observed phenomenon depends strongly on the applied de field, and the memory effect in a nematic film depends strongly on the grating constant. (C) 2001 Optical Society of America.

引用

页码：521 / 523

页数：3

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