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

Research output: Contribution to journalArticlepeer-review

84 Citations (Scopus)


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 languageEnglish
Pages (from-to)21395-21402
Number of pages8
JournalOptics Express
Issue number18
Publication statusPublished - 2013 Sept 9

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


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