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Optical second-harmonic generation in ferroelectric chiral smectic polysiloxane |
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| Authors: | M Ozaki M Sakuta K Yoshino B Helgee M Svensson K Skarp |
| Institution: | (1) Department of Electronic Engineering, Faculty of Engineering, Osaka University, 2-1 Yamada-Oka, 565 Suita, Osaka, Japan;(2) Department of Polymer Technology, Chalmers University of Technology, S-41296 Göteborg, Sweden;(3) Physics Department, Chalmers University of Technology, S-41296 Göteborg, Sweden |
| Abstract: | The second-order nonlinear optical properties of ferroelectric liquid crystalline polymer have been studied. Angular phase-matched Second-Harmonic Generation (SHG) is observed in the chiral smectic C (SmC*) phase of siloxane copolymer with chiral mesogen in the side chain. The effective nonlinear optical coefficient deff under the phase-matching condition is determined. The intense SHG is observed even in the crystalline phase by cooling down from the SmC* phase under the electric field. The effective coefficient of SHG in the crystalline phase is more than ten times larger than that of the phase-matched SHG in the SmC* phase. The enhancement of SHG in the crystalline phase is observed only in a homeotropically aligned cell and maintained even in the non-biased state for at least several days. The angular dependence of the SHG in the crystalline phase is confirmed. |
| Keywords: | 61 30 42 65 |
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