Wednesday, December 14, 2016

Abstract-The birefringence of two liquid crystals in terahertz band

Huijuan SunLingqin KongYuejin Zhao
Beijing Institute of Technology (China)
Qingli ZhouChenyu LiCunlin Zhang
Capital Normal Univ. (China)
Proc. SPIE 10030, Infrared, Millimeter-Wave, and Terahertz Technologies IV, 100302D (December 8, 2016); doi:10.1117/12.2246343

Compared with the wide application of liquid crystals (LCs) in the visible frequency band, their properties in the terahertz band have not been investigated extensively yet. In this paper, we have investigated the optical anisotropy of LCs TEB30A and 9023 at room temperature using terahertz time-domain spectroscopy (THz-TDS). The extraordinary and ordinary refraction indices of LC TEB30A are ne≈1.84 and no≈1.65, or a birefringence of 0.19 from 0.5 to 2.2 THz. The extraordinary and ordinary refraction indices of LC 9023 are ne≈1.83 and no≈1.62, or a birefringence of 0.21 from 0.5 to 2.2 THz. LC 9023 exhibits a little larger terahertz birefringence than that of LC TEB30A.
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