標題: Liquid-Crystal Terahertz Quarter-Wave Plate Using Chemical-Vapor-Deposited Graphene Electrodes
作者: Yang, Chan-Shan
Kuo, Chun
Tang, Chiu-Chun
Chen, J. C.
Pan, Ru-Pin
Pan, Ci-Ling
電子物理學系
Department of Electrophysics
關鍵字: Far infrared or terahertz;phase shift;liquid crystals;nanomaterials;liquid-crystal devices;birefringence;spectroscopy
公開日期: 1-Dec-2015
摘要: Quarter-wave operation or a phase shift of more than pi/2, which is approximately ten times greater than that reported in previous works using liquid crystals (LCs) and graphene electrodes, was demonstrated. The device is transparent to the terahertz (THz) wave, and the driving voltage required was as low as approximately 2.2 V (rms), which is also unprecedented. Experimental results supported a theoretical formalism adapted for LC cells with THz wavelength-scale thickness. The scattering rate, DC mobility, and carrier mean free path of bilayer graphene were also determined using THz spectroscopic techniques; the parameters were inferior to those of monolayer graphene. This observation can be attributed to the higher density of charged impurities in the bilayer graphene. The device performances of LC phase shifters using monolayer and bilayer graphene as electrodes were essentially identical.
URI: http://dx.doi.org/10.1109/JPHOT.2015.2504960
http://hdl.handle.net/11536/129554
ISSN: 1943-0655
DOI: 10.1109/JPHOT.2015.2504960
期刊: IEEE PHOTONICS JOURNAL
Volume: 7
Issue: 6
起始頁: 0
結束頁: 0
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