標題: The complex refractive indices of the liquid crystal mixture E7 in the terahertz frequency range
作者: Yang, Chan-Shan
Lin, Chia-Jen
Pan, Ru-Pin
Que, Christopher T.
Yamamoto, Kohji
Tani, Masahiko
Pan, Ci-Ling
電子物理學系
Department of Electrophysics
公開日期: 1-Sep-2010
摘要: We have used terahertz time-domain spectroscopy to investigate the complex optical constants and birefringence of a widely used liquid crystal mixture E7 in both nematic and isotropic phases (26 degrees C-70 degrees C). The extinction coefficient of E7 at room temperature is less than 0.035 and without sharp absorption features in the frequency range of 0.2-2.0 THz. The extraordinary (n(e)) and ordinary (n(o)) indices of refraction at 26 C are 1.690-1.704 and 1.557-1.581, respectively, giving rise to a birefringence of 0.130-0.148 in this frequency range. The temperature-dependent (26 degrees C-70 degrees C) order parameter extracted from the birefringence data agrees with that in the visible region quite well. Further, the temperature gradients of the terahertz optical constants of E7 are also determined. The optical constants of E7 in the terahertz or sub-millimeter wave range are found to deviate significantly from values predicated by the usual extended Cauchy equations used in the visible and near-infrared. (C) 2010 Optical Society of America
URI: http://dx.doi.org/10.1364/JOSAB.27.001866
http://hdl.handle.net/11536/32250
ISSN: 0740-3224
DOI: 10.1364/JOSAB.27.001866
期刊: JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
Volume: 27
Issue: 9
起始頁: 1866
結束頁: 1873
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