Electrically triggered dual-band tunable terahertz metamaterial band-pass filter based on Si3N4-VO2-Si3N4 sandwich

doi:10.1088/1674-1056/28/5/054203

Abstract We experimentally demonstrate an electrically triggered terahertz (THz) dual-band tunable band-pass filter based on Si₃N₄-VO₂-Si₃N₄ sandwich-structured hybrid metamaterials. The insulator-metal phase transition of VO₂ film is induced by the Joule thermal effect of the top metal layer. The finite-integration-time-domain (FITD) method and finite element method (FEM) are used for numerical simulations. The sample is fabricated using a surface micromachining process, and characterized by a THz time-domain-spectrometer (TDS). When the bias current is 0.225 A, the intensity modulation depths at two central frequencies of 0.56 THz and 0.91 THz are about 81.7% and 81.3%, respectively. This novel design can achieve dynamically electric-thermo-optic modulation in the THz region, and has potential applications in the fields of THz communications, imaging, sensing, and astronomy exploration.

Keywords: tunable band-pass filter hybrid metamaterials terahertz vanadium dioxide (VO₂)

Received: 21 December 2018
Revised: 17 January 2019
Accepted manuscript online:

PACS:	42.79.Ci	(Filters, zone plates, and polarizers)
	81.05.Xj	(Metamaterials for chiral, bianisotropic and other complex media)
	84.30.Vn	(Filters)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11574059, 61565004, and 11774288), the National Technology Major Special Project, China (Grant No. 2017ZX02101007-003), the Natural Science Foundation of Guangxi, China (Grant Nos. 2015GXNSFDA139039 and 2017GXNSFBA198116), the Foundation from Guangxi Key Laboratory of Automatic Detection Technology and Instrument, China (Grant No. YQ16101), and the Innovation Project of Guangxi Graduate Education, China (Grant Nos. 2018YJCX70, 2018YJCX67, and 2018YJCX74).

Corresponding Authors: Fangrong Hu
E-mail: hufangrong@sina.com

Cite this article:

Shuai Zhao(赵帅), Fangrong Hu(胡放荣), Xinlong Xu(徐新龙), Mingzhu Jiang(江明珠), Wentao Zhang(张文涛), Shan Yin(银珊), Wenying Jiang(姜文英) Electrically triggered dual-band tunable terahertz metamaterial band-pass filter based on Si₃N₄-VO₂-Si₃N₄ sandwich 2019 Chin. Phys. B 28 054203

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Electrically triggered dual-band tunable terahertz metamaterial band-pass filter based on Si3N4-VO2-Si3N4 sandwich

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Electrically triggered dual-band tunable terahertz metamaterial band-pass filter based on Si₃N₄-VO₂-Si₃N₄ sandwich