Linear and Nonlinear Electro-optic Response of MHPOCBC

Authors

  • Andika Fajar Research Center for Nanotechnology System, National Research and Innovation Agency, KST. B.J. Habibie, Jalan Raya Puspiptek 60, South Tangerang 15314, Indonesia
  • Hiroshi Orihara Research Institute for Electronic Science, Hokkaido University, N20W10 Kita-Ward Sapporo 001-0020, Japan

DOI:

https://doi.org/10.5614/j.math.fund.sci.2024.55.3.2

Keywords:

chiral smectic, electro-optic, liquid crystal, relaxation mode, MHPOCBC

Abstract

This study investigated the linear and second-order electro-optic responses in chiral smectic liquid crystal 4-(1-methylheptyloxycarbonyl) phenyl 4-octylcarbonyloxybiphenyl-4-carboxylate (MHPOCBC). The result revealed a single Debye-type relaxation in the linear electro-optic frequency dispersion, with a relaxation frequency extending up to one hundred kHz. Conversely, the second-order electro-optic response exhibited intricate temperature-dependence, accurately depicted by a phenomenological Landau theory around the SmA?SmCa* phase transition point. Notably, in the SmCa* phase, critical slowing down of the amplitude mode occurred near the transition to the SmA phase, while at lower temperatures of the SmCa* phase, a distinct low-frequency relaxation mode emerged. Furthermore, the relaxation frequency of the antiferroelectric Goldstone mode in the SmCA* phase remained constant across the entire temperature range. These findings should significantly contribute to the understanding of dynamic behaviors in chiral smectic liquid crystals, shedding light on their complex phase transitions and electro-optic properties.

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2024-05-28

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