Fast Optical Switching Using Oriented Cyanine Dye-Doped Nematic Liquid Crystal
JIN Zhao-Hui, LI Zhong-Yu, KASATANI Kazuo, OKAMOTO Hiroaki
Department of Advanced Materials Science and Engineering, Faculty of Engineering, Yamaguchi University, Tokiwadai, Ube 755-8611, Japan
Fast Optical Switching Using Oriented Cyanine Dye-Doped Nematic Liquid Crystal
JIN Zhao-Hui;LI Zhong-Yu;KASATANI Kazuo;OKAMOTO Hiroaki
Department of Advanced Materials Science and Engineering, Faculty of Engineering, Yamaguchi University, Tokiwadai, Ube 755-8611, Japan
关键词 ：
42.70.Nq ,
42.65.An ,
78.20.Wc
Abstract ： 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 (5CB), and the mixture is sandwiched between two pieces of rubbed glass plates. The third-order nonlinear optical properties of the oriented NK-125-5CB layers are measured by the resonant femtosecond degenerate four-wave mixing (DFWM) technique at 760nm. 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-125-5CB 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 4ps. It is expected that NK-125-5CB can be used as a material for very fast all-optical switching.
Key words ：
42.70.Nq
42.65.An
78.20.Wc
出版日期: 2006-10-01
:
42.70.Nq
(Other nonlinear optical materials; photorefractive and semiconductor materials)
42.65.An
(Optical susceptibility, hyperpolarizability)
78.20.Wc
引用本文:
JIN Zhao-Hui;LI Zhong-Yu;KASATANI Kazuo;OKAMOTO Hiroaki. Fast Optical Switching Using Oriented Cyanine Dye-Doped Nematic Liquid Crystal[J]. 中国物理快报, 2006, 23(10): 2786-2789.
链接本文:
https://cpl.iphy.ac.cn/CN/
或
https://cpl.iphy.ac.cn/CN/Y2006/V23/I10/2786
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