Saturday, 14 September 2013
Graphene/liquid crystal based terahertz phase shifters
Yang Wu, Xuezhong Ruan, Chih-Hsin Chen, Young Jun Shin, Youngbin Lee, Jing Niu, Jingbo Liu, Yuanfu Chen, Kun-Lin Yang, Xinhai Zhang, Jong-Hyun Ahn, and Hyunsoo Yang
Department of Electrical Engineering and Computer Engineering, National University of Singapore, Singapore Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore
School of Electric & Electronic Engineering, Yonsei University, Seoul, 120-749 and SKKU Advanced Institute of Nanotechnology, Sungkyunkwan University, Suwon, 440-746, South Korea
State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China
Institute of Materials Research and Engineering, 3 Research Link, 117602, Singapore
Graphene Research Centre, National University of Singapore, 6 Science Drive 2, Singapore 117546, Singapore
see Optics Express, Vol. 21, Issue 18, pp. 21395-21402 (2013) http://dx.doi.org/10.1364/OE.21.021395
Abstract: Due to its high electrical conductivity and excellent transmittance at terahertz frequencies, graphene is a promising candidate as transparent electrodes for terahertz devices. We demonstrate a liquid crystal based terahertz phase shifter with the graphene films as transparent electrodes. The maximum phase shift is 10.8 degree and the saturation voltage is 5 V with a 50 µm liquid crystal cell. The transmittance at terahertz frequencies and electrical conductivity depending on the number
of graphene layer are also investigated. The proposed phase shifter provides a continuous tunability, fully electrical controllability, and low DC voltage operation.
... film plane. The measurements have been conducted in a commercial THz time domain spectroscopy setup (Teraview TPS spectra 3000) [27, 28], which can generate a well-defined plane wave pulse from 0.06 - 4.0 THz. For ..
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