Polarization-independent terahertz wave modulator based on graphene-silicon hybrid structure

doi:10.1088/1674-1056/25/2/027301

Abstract In this study, we propose and demonstrate a broadband polarization-independent terahertz modulator based on graphene/silicon hybrid structure through a combination of continuous wave optical illumination and electrical gating. Under a pump power of 400 mW and the voltages ranging from -1.8 V to 1.4 V, modulation depths in a range of -23%-62% are achieved in a frequency range from 0.25 THz to 0.65 THz. The modulator is also found to have a transition from unidirectional modulation to bidirectional modulation with the increase of pump power. Combining the Raman spectra and Schottky current-voltage characteristics of the device, it is found that the large amplitude modulation is ascribed to the electric-field controlled carrier concentration in silicon with assistance of the graphene electrode and Schottky junction.

Keywords: terahertz modulator graphene

Received: 21 August 2015
Revised: 15 October 2015
Accepted manuscript online:

PACS:	73.20.Mf	(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))
	42.25.Bs	(Wave propagation, transmission and absorption)
	78.66.-w	(Optical properties of specific thin films)

Fund: Project supported by the National Natural Science Foundation of China, (Grant No. 61565004), the Natural Science Foundation of Guangxi Zhuang Autonomous Region, China (Grant Nos. 2013GXNSFDA019002 and 2014GXNSFGA118003), the Guangxi Scientific Research and Technology Development Program, China (Grant No. 1598017-1), the Guilin Scientific Research and Technology Development Program, China (Grant Nos. 20140127-1 and 20150133-3), and the Special Funds for Distinguished Experts of Guangxi Zhuang Autonomous Region, China.

Corresponding Authors: Wen-Tao Zhang
E-mail: gliezwt@163.com

Cite this article:

Liang-Liang Du(杜亮亮), Quan Li(李泉), Shao-Xian Li(李绍限), Fang-Rong Hu(胡放荣), Xian-Ming Xiong(熊显名), Yan-Feng Li(栗岩锋), Wen-Tao Zhang(张文涛), Jia-Guang Han(韩家广) Polarization-independent terahertz wave modulator based on graphene-silicon hybrid structure 2016 Chin. Phys. B 25 027301

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Polarization-independent terahertz wave modulator based on graphene-silicon hybrid structure

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