The Birefringence and Extinction Coefficient of Ferroelectric Liquid Crystals in the Terahertz Range-Reference-Cited by-同舟云学术

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

Published:2023-12-13 Issue:12 Volume:10 Page:1368
ISSN:2304-6732
Container-title:Photonics
language:en
Short-container-title:Photonics

Author:

Ma Ying¹,Shan Yuhang¹,Cheng Yongning¹,Yang Ruisheng²,Kwok Hoi-Sing³,Zhao Jianlin¹^ORCID

Affiliation:

1. Key Laboratory of Light Field Manipulation and Information Acquisition, Ministry of Industry and Information Technology, School of Physics Science and Technology, Northwestern Polytechnical University, Xi’an 710129, China

2. MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, School of Physical Science and Technology, Northwestern Polytechnical University, Xi’an 710129, China

3. State Key Laboratory (SKL) on Advanced Displays and Optoelectronics Technologies, Department of Electronic and Computer Engineering, Hong Kong University of Science and Technology, Kowloon 999077, Hong Kong

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.

Funder

National Science Foundation of China

Publisher

MDPI AG

Subject

Radiology, Nuclear Medicine and imaging,Instrumentation,Atomic and Molecular Physics, and Optics

Link

https://www.mdpi.com/2304-6732/10/12/1368/pdf

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