The Birefringence and Extinction Coefficient of Ferroelectric Liquid Crystals in the Terahertz Range

IF 2.1 4区物理与天体物理 Q2 OPTICS

Photonics Pub Date : 2023-12-13 DOI:10.3390/photonics10121368

Ying Ma, Yuhang Shan, Yongning Cheng, Ruisheng Yang, H. Kwok, Jianlin Zhao

引用次数: 0

Abstract

In this paper, the refractive index and extinction coefficient of ferroelectric liquid crystals have been examined by the terahertz time-domain spectroscopy system. Two modes of ferroelectric liquid crystal materials, deformed helix ferroelectric liquid crystal (DHFLC), and electric suppressed helix ferroelectric liquid crystal (ESHFLC) are tested as experimental samples. Nematic liquid crystal (NLC) was also investigated for comparison. The birefringence of DHFLC 587 slowly increases with the growth of frequency, and it averages at 0.115. Its extinction coefficients gradually incline to their stable states at 0.06 for o-wave and 0.04 for e-wave. The birefringence of ESHFLC FD4004N remains between around 0.165 and 0.175, and both of its e-wave and o-wave extinction coefficients are under 0.1, ranging from 0.05 to 0.09. These results of FLC will facilitate the examination and improve the response performance of THz devices using fast liquid crystal materials.

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太赫兹范围内铁电液晶的双折射和消光系数

本文利用太赫兹时域光谱系统研究了铁电液晶的折射率和消光系数。以变形螺旋铁电液晶（DHFLC）和电抑制螺旋铁电液晶（ESHFLC）两种模式的铁电液晶材料为实验样品进行了测试。此外，还对向列液晶（NLC）进行了对比研究。DHFLC 587 的双折射随频率的增长而缓慢增加，平均值为 0.115。其消光系数逐渐趋于稳定状态，o 波为 0.06，e 波为 0.04。ESHFLC FD4004N 的双折射保持在 0.165 至 0.175 之间，其 e 波和 o 波消光系数均低于 0.1，在 0.05 至 0.09 之间。FLC的这些结果将有助于检验和改进使用快速液晶材料的太赫兹器件的响应性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Photonics Physics and Astronomy-Instrumentation

CiteScore

2.60

自引率

20.80%

发文量

817

审稿时长

8 weeks

期刊介绍： Photonics (ISSN 2304-6732) aims at a fast turn around time for peer-reviewing manuscripts and producing accepted articles. The online-only and open access nature of the journal will allow for a speedy and wide circulation of your research as well as review articles. We aim at establishing Photonics as a leading venue for publishing high impact fundamental research but also applications of optics and photonics. The journal particularly welcomes both theoretical (simulation) and experimental research. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Electronic files and software regarding the full details of the calculation and experimental procedure, if unable to be published in a normal way, can be deposited as supplementary material.