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Optical second-harmonic generation in ferroelectric chiral smectic polysiloxane

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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.

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Ozaki, M., Sakuta, M., Yoshino, K. et al. Optical second-harmonic generation in ferroelectric chiral smectic polysiloxane. Appl. Phys. B 59, 601–606 (1994). https://doi.org/10.1007/BF01081180

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PACS

  • 61.30
  • 42.65