Saturday, 14 September 2013

Graphene/liquid crystal based terahertz phase shifters

TPS Spectra 300Yang 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)

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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