Origin of optical nonlinearity of photo-responsive liquid crystals revealed by transient grating imaging (Conference Presentation)

Kenji Katayama; Kin-ichiro Nagasaka; Minako Miyagawa; Woon Yong Sohn

doi:10.1117/12.2315783

18 September 2018 Origin of optical nonlinearity of photo-responsive liquid crystals revealed by transient grating imaging (Conference Presentation)

Kenji Katayama, Kin-ichiro Nagasaka, Minako Miyagawa, Woon Yong Sohn

Author Affiliations +

Proceedings Volume 10735, Liquid Crystals XXII; 1073505 (2018) https://doi.org/10.1117/12.2315783
Event: SPIE Organic Photonics + Electronics, 2018, San Diego, California, United States

Abstract

A colossal optical nonlinearity has been observed for the dye-doped liquid crystals under the condition that the nematic phase is very close to the isotropic condition, and it has been usually explained by the effect of the dye-induced torque on the liquid crystal. However, the direct observation of the photo-response by the time-resolved transient grating phase imaging revealed that the optical nonlinear polarization, causing the extraordinary refractive index change, was observed in the liquid crystal region, where the light was not irradiated. Furthermore, a shock-like wave was observed after this nonlinear response ended. We propose that a compression wave generated at the disordered/ordered interface induced the reorientation of liquid crystal molecules to generate a larger polarization, causing the optical nonlinearity.

Conference Presentation

Citation Download Citation

Kenji Katayama, Kin-ichiro Nagasaka, Minako Miyagawa, and Woon Yong Sohn "Origin of optical nonlinearity of photo-responsive liquid crystals revealed by transient grating imaging (Conference Presentation)", Proc. SPIE 10735, Liquid Crystals XXII, 1073505 (18 September 2018); https://doi.org/10.1117/12.2315783

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