CUED Publications database

High-birefringence nematic liquid crystal for broadband THz applications

Li, X and Tan, N and Pivnenko, M and Sibik, J and Zeitler, JA and Chu, D (2016) High-birefringence nematic liquid crystal for broadband THz applications. Liquid Crystals, 43. pp. 955-962. ISSN 0267-8292

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© 2016 The Author(s). Published by Taylor & Francis. Liquid crystals (LCs) have been studied extensively in the visible range for their dielectric tunability, and the characterisation in the terahertz (THz) range has gained increasing interest due to the need for active THz modulation and switching devices. In this paper, we use THz time-domain spectroscopy to measure the frequency-dependent birefringence and the absorption coefficient of a number of commercial and non-commercial nematic LCs, including E7, BL037, MDA-98-1602, LCMS-107, GT3-23001 and 1825, over a range of bias voltages at room temperature. Furthermore, several basic components of LC mixture are analysed to establish their contributions to birefringence and theoretical model is used to fit the absorption spectra. The large tunability and low loss measured for a range of samples show that the LCs are useful tunable dielectrics for compact, efficient and broadband THz devices. (formula Presented)

Item Type: Article
Divisions: Div B > Photonics
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:00
Last Modified: 25 Feb 2021 06:31
DOI: 10.1080/02678292.2016.1153732