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A terahertz modulator based on double-layer graphene

BINGGANG XIAO1,* , RUNLIANG SUN1, ZHIYI XIE1, XIUMIN WANG1

Affiliation

  1. College of Information Engineering, China Jiliang University, 258 Xueyuan street, Hangzhou 310018, China

Abstract

Terahertz electromagnetic spectrum has long been recognized as an important region for scientific research. A new efficient broadband modulator for terahertz waves at room temperature can be realized using double layer graphene. The modulator is mainly composed by graphene-Al2O3-graphene three layers structure, with the carrier density of graphene modified by bias voltage, the absorption can be modulated quickly. The plane wave scattering and absorption by electric biased graphene are studied by the equivalent circuit method. This simplified equivalent circuit has good transportability, which is easy to calculate. The graphene based THz modulator has advantages like low cost, excellent tunability and easy to control, thus promising for THz system applications..

Keywords

Graphene, Terahertz modulator, Equivalent circuit.

Citation

BINGGANG XIAO, RUNLIANG SUN, ZHIYI XIE, XIUMIN WANG, A terahertz modulator based on double-layer graphene, Optoelectronics and Advanced Materials - Rapid Communications, 9, 5-6, May-June 2015, pp.692-695 (2015).

Submitted at: July 14, 2014

Accepted at: May 7, 2015