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; Hyunsoo Yang

doi:10.1364/OE.21.021395

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, Hyunsoo Yang

Department of Electrical and Electronic Engineering

Research output: Contribution to journal › Article › peer-review

84 Citations (Scopus)

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.

Original language	English
Pages (from-to)	21395-21402
Number of pages	8
Journal	Optics Express
Volume	21
Issue number	18
DOIs	https://doi.org/10.1364/OE.21.021395
Publication status	Published - 2013 Sept 9

All Science Journal Classification (ASJC) codes

Atomic and Molecular Physics, and Optics

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10.1364/OE.21.021395

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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.",

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AU - Wu, Yang

AU - Ruan, Xuezhong

AU - Chen, Chih Hsin

AU - Shin, Young Jun

AU - Lee, Youngbin

AU - Niu, Jing

AU - Liu, Jingbo

AU - Chen, Yuanfu

AU - Yang, Kun Lin

AU - Zhang, Xinhai

AU - Ahn, Jong Hyun

AU - Yang, Hyunsoo

PY - 2013/9/9

Y1 - 2013/9/9

N2 - 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.

AB - 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.

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Graphene/liquid crystal based terahertz phase shifters

Abstract

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