| Original Articles |
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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 |
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| Cite this article: |
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JIN Zhao-Hui, LI Zhong-Yu, KASATANI Kazuo et al 2006 Chin. Phys. Lett. 23 2786-2789 |
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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 5.5×10-8esu. 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.
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| Keywords:
42.70.Nq
42.65.An
78.20.Wc
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Published: 01 October 2006
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| PACS: |
42.70.Nq
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(Other nonlinear optical materials; photorefractive and semiconductor materials)
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42.65.An
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(Optical susceptibility, hyperpolarizability)
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78.20.Wc
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