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 YangDepartment 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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