Anisotropy of Dye Diffusion in Smectic Phases Studied by Forced Rayleigh Scattering

Takashi Nishikawa Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152, Japan; Opto-Electronics Research Laboratory, Semiconductor Research Center, Matsushita Electric Industry Co., Ltd., 3-1-1 Yagumonakamachi, Moriguchi-shi, Osaka, 570

Jiro Minabe Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152, Japan; Electronic Imaging & Devices Research Lab., Fuji Xerox Co., Ltd., 2274 Hongo, Ebina-shi, Kanagawa, 243-04

Hideo Takezoe Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152, Japan

Atsuo Fukuda Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152, Japan

Abstract

We have observed strong thermal grating excitation in the isotropic and nematic phase of pentylcyanobiphenyl (5CB) in wave-mixing experiments using intense green picosecond excitation pulses at λ = 532 nm. It is shown that optical heating is provided by a three-photon absorption process in the commonly called “highly transparent” liquid crystal. We have further investigated the relaxation of the induced thermal gratings, which exhibits a critical slowing at the nematic-isotropic phase transition.

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Anisotropy of Dye Diffusion in Smectic Phases Studied by Forced Rayleigh Scattering

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Anisotropy of Dye Diffusion in Smectic Phases Studied by Forced Rayleigh Scattering

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