Tunable ultra-wideband terahertz filter based on three-dimensional arrays of H-shaped plasmonic crystals

doi:10.1088/1674-1056/23/1/018102

Abstract A face-to-face system of double-layer three-dimensional arrays of H-shaped plasmonic crystals is proposed, and its transmission and filtering properties are investigated in the terahertz regime. Simulation results show that our design has excellent filtering properties. It has an ultra-wide bandgap and passband with steep band-edges, and the transmittance of the passband and the forbidden band are very close to 1 and 0, respectively. As the distance between the two face-to-face plates increases, the resonance frequency exhibits a gradual blueshift from 0.88 THz to 1.30 THz. Therefore, we can dynamically control the bandwidths of bandgap and passband by adding a piezoelectric ceramic plate between the two crystal plates. Furthermore, the dispersion relations of modes and electric field distributions are presented to analyze the generation mechanisms of bandgaps and to explain the location of bandgaps and the frequency shift phenomenon. Due to the fact that our design can provide many resonant modes, the bandwidth of the bandgaps can be greatly broadened. This paper can serve as a valuable reference for the design of terahertz functional devices and three-dimensional terahertz metamaterials.

Keywords: terahertz wideband filter plasmonic crystal metamaterials

Received: 25 April 2013
Revised: 08 August 2013
Accepted manuscript online:

PACS:	81.05.Xj	(Metamaterials for chiral, bianisotropic and other complex media)
	42.25.Bs	(Wave propagation, transmission and absorption)
	78.20.-e	(Optical properties of bulk materials and thin films)
	46.40.Ef

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61271066, 61101058, and 61107086) and the Science and Technology Committee of Tianjin Province, China (Grant No. 11JCYBJC01100).

Corresponding Authors: Xu Shi-Lin
E-mail: xushilin80@163.com

Cite this article:

Yuan Cai (袁偲), Xu Shi-Lin (徐世林), Yao Jian-Quan (姚建铨), Zhao Xiao-Lei (赵晓蕾), Cao Xiao-Long (曹小龙), Wu Liang (吴亮) Tunable ultra-wideband terahertz filter based on three-dimensional arrays of H-shaped plasmonic crystals 2014 Chin. Phys. B 23 018102

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Tunable ultra-wideband terahertz filter based on three-dimensional arrays of H-shaped plasmonic crystals

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