A Metamaterial-Based Terahertz Low-Pass Filter With Low Insertion Loss and Sharp Rejection

Author

Zhihua Zhu ; Xueqian Zhang ; Jianqiang Gu ; Singh, Rajdeep ; Zhen Tian ; Jiaguang Han ; Weili Zhang

Author_Institution

Center for Terahertz Waves, Tianjin Univ., Tianjin, China

Volume

3

Issue

6

fYear

2013

fDate

Nov. 2013

Firstpage

832

Lastpage

837

Abstract

In this paper, we present an efficient low-pass terahertz (THz) filter design based on MEMS technology. With a cascaded arrangement of two functional meta-layers, we demonstrate a nearly loss-free response at the lower frequency passband and sharp rejection characteristics at the higher frequency stopband, with a steep roll-off of 296 dB/THz. The bandwidth of the low-pass filter is easily tuned by scaling the structural parameters of the metamaterial unit cell. The low-pass filter works efficiently even at oblique angles of incidence, making it attractive for practical applications in THz signal processing.

Keywords

band-pass filters; low-pass filters; micro-optomechanical devices; microwave photonics; optical design techniques; optical losses; optical metamaterials; spatial filters; terahertz metamaterials; MEMS technology; THz signal processing; cascaded arrangement; frequency passband; frequency stopband; functional metalayers; insertion loss; metamaterial unit cell; metamaterial-based terahertz low-pass filter; oblique incidence angles; sharp rejection characteristics; steep roll-off; structural parameters; Analytical models; Cutoff frequency; Metamaterials; Optimized production technology; Passband; Low-pass filters; metamaterials; passband; selectivity; terahertz (THz);

fLanguage

English

Journal_Title

Terahertz Science and Technology, IEEE Transactions on

Publisher

ieee

ISSN

2156-342X

Type

jour

DOI

10.1109/TTHZ.2013.2285342

Filename

6661412