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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 18 — Sep. 9, 2013
  • pp: 21395–21402

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  »View Author Affiliations

Optics Express, Vol. 21, Issue 18, pp. 21395-21402 (2013)

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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.

© 2013 OSA

OCIS Codes
(050.5080) Diffraction and gratings : Phase shift
(160.3710) Materials : Liquid crystals
(240.6680) Optics at surfaces : Surface plasmons
(040.2235) Detectors : Far infrared or terahertz

ToC Category:
Optical Devices

Original Manuscript: July 1, 2013
Revised Manuscript: August 26, 2013
Manuscript Accepted: August 26, 2013
Published: September 4, 2013

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, "Graphene/liquid crystal based terahertz phase shifters," Opt. Express 21, 21395-21402 (2013)

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