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Fast Optical Switching Using Oriented Cyanine Dye-Doped Nematic Liquid Crystal
作者姓名:金朝辉  李忠玉  KASATANI  Kazuo  OKAMOTO  Hiroaki
作者单位:Department of Advanced Materials Science and Engineering, Faculty of Engineering, Yamaguchi University, Tokiwadai, Ube 755-8611, Japan
基金项目:Supported by the Venture Busin,ess Laboratory, Yamaguchi University.
摘    要:A cyanine dye, 2-7-(1,3-dihydro-1,3,3-trimethyl-2H-indol-2-ylidene)-1,3,5-heptatrienyl]-1,3,3-trimethyl-3H-indolium iodide (NK-125), is doped in 4-cyano-4'-pentylbiphenyl (5 CB), and the mixture is sandwiched between two pieces of rubbed glass plates. The third-order nonlinear optical properties of the oriented NK-125-SCB layers are measured by the resonant femtosecond degenerate four-wave mixing (DFWM) technique at 760 nm. The third-order nonlinear optical susceptibility of one of the present samples is 5.5×10^-8 esu. The slow DFWM response of the NK-125-SCB layers due to a population grating is accelerated by the increasing laser power because of amplified spontaneous emission (ASE). On the other hand, we do not observe a similar phenomenon for NK-125- polyethylene glycol (PEG-400). Oriented NK-125 molecules in nematic liquid crystals must have very high ASE efficiency. Hence the population grating in a DFWM signal disappears within about 4 ps. It is expected that NK-125-SCB can be used as a material for very fast all-optical switching.

关 键 词:快速光开光  液晶  非线性光学  DFWM信号
收稿时间:2006-02-13
修稿时间:2006-02-13

Fast Optical Switching Using Oriented Cyanine Dye-Doped Nematic Liquid Crystal
JIN Zhao-Hui, LI Zhong-Yu, KASATANI Kazuo, OKAMOTO Hiroaki.Fast Optical Switching Using Oriented Cyanine Dye-Doped Nematic Liquid Crystal[J].Chinese Physics Letters,2006,23(10):2786-2789.
Authors:JIN Zhao-Hui  LI Zhong-Yu  KASATANI Kazuo  OKAMOTO Hiroaki
Abstract:
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