標題: Optical constants of two typical liquid crystals 5CB and PCH5 in the THz frequency range
作者: Pan, RP
Tsai, TR
Chen, CY
Pan, CL
電子物理學系
光電工程學系
Department of Electrophysics
Department of Photonics
關鍵字: 5CB;absorption;birefringence;liquid crystal;optical constants;PCH5;refractive index;THz;time-domain spectroscopy
公開日期: 2003
摘要: The complex refractive indices of two benchmark nematic liquid crystal, 4'-n-pentyl-4-cyanobiphenyl (5CB) and 4-(trans-4'pentylcyclohexyl)-benzonitrile (PCH5) have been determined in the frequency range from 0.2 to 0.8 THz. The technique of coherent THz time-domain spectroscopy (THz-TDS) was used. We show that the birefringence of 5CB is in the range of 0.15 to 0.21, while that of PCH is from 0.01 to 0.08. Both liquid crystals exhibit relatively small absorption in this frequency range. The large birefringence of 5CB indicates possible applications of liquid-crystal-based devices for modulation and polarization control of electromagnetic radiation in the THz frequency range.
URI: http://hdl.handle.net/11536/28217
http://dx.doi.org/10.1023/A:1024485918938
ISSN: 0092-0606
DOI: 10.1023/A:1024485918938
期刊: JOURNAL OF BIOLOGICAL PHYSICS
Volume: 29
Issue: 2-3
起始頁: 335
結束頁: 338
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