Effect of host liquid crystal structure on nonlinear molecular reorientation of oligothiophene-doped liquid crystals

Junki Yokota; Miho Aizawa; Kyohei Hisano; Shoichi Kubo; Rumiko Yamaguchi; Atsushi Shishido

doi:10.1117/12.2674372

29 September 2023 Effect of host liquid crystal structure on nonlinear molecular reorientation of oligothiophene-doped liquid crystals

Junki Yokota, Miho Aizawa, Kyohei Hisano, Shoichi Kubo, Rumiko Yamaguchi, Atsushi Shishido

Author Affiliations +

Proceedings Volume 12658, Liquid Crystals XXVII; 1265805 (2023) https://doi.org/10.1117/12.2674372
Event: SPIE Organic Photonics + Electronics, 2023, San Diego, California, United States

Abstract

Nonlinear optical (NLO) materials whose optical properties change in accordance with incident light intensity are attracting much attention in various fields. Liquid crystals (LCs) exhibit the largest nonlinearity among functional materials due to their photoinduced molecular reorientation. In particular, doping dichroic oligothiophene dye into LCs increases the light sensitivity of materials based on the interaction between dyes and an optical-electric field. Furthermore, the absorbance of this LC system drastically increases through the dye molecules' reorientation, promising. for application to the optical limiter; however, practical applications require better light sensitivity. In this study, we investigated the effect of the host LC structure such as fluorinated LCs on optical limiting behavior derived from nonlinear molecular reorientation. Irradiation of dye-doped LCs with a laser beam brought about molecular reorientation, and the transmittance decreased with an incident light intensity. Furthermore, the threshold light intensity for optical limiting behavior depended on the host LCs structure. Trifluorinated LCs effectively increased the light sensitivity of the dye-doped LCs compared to LCs without fluorine substituents. This result contributes to the material design for the low threshold optical devices utilizing the NLO of dye-doped LCs.

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Citation Download Citation

Junki Yokota, Miho Aizawa, Kyohei Hisano, Shoichi Kubo, Rumiko Yamaguchi, and Atsushi Shishido "Effect of host liquid crystal structure on nonlinear molecular reorientation of oligothiophene-doped liquid crystals", Proc. SPIE 12658, Liquid Crystals XXVII, 1265805 (29 September 2023); https://doi.org/10.1117/12.2674372

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