Open AccessA polarization-independent and ultra-broadband terahertz metamaterial absorber studied based on circular-truncated cone structure
Author(s) -
Mo Man-Man,
Qiye Wen,
Zhi Chen,
Yang Qing-hui,
Li Sheng,
Yulan Jing,
Huaiwu Zhang
Publication year - 2013
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.62.237801
Subject(s) - terahertz radiation , metamaterial absorber , metamaterial , optics , broadband , materials science , finite difference time domain method , molar absorptivity , polarization (electrochemistry) , circular polarization , microwave , optoelectronics , physics , tunable metamaterials , microstrip , chemistry , quantum mechanics
In this paper, we present an ultra-broadband polarization-independent terahertz (THz) metamaterial absorber (MA) made of circular truncated cone metamaterial. Absorptivity higher than 92.3% at normal incidence is obtained in a wide range of frequencies from 2 to 10 THz. We employ an isotropic metamaterial cell which consists of alternating layers of Au metal and SiO2 dielectric spacer. The absorption spectra of the THz MA are calculated using the finite-difference time domain (FDTD) method within the CST Microwave Studio 2009 in the frequency range of 0–10 THz. Our broadband absorber can be regarded as a group of micro-absorbers perpendicularly stacked and their absorption peaks coupling to each other to form an ultra broadband absorption. This THz MA has the advantages of broadband, polarization-independent and fabrication facility, and thus can be widely applied in THz wave harvesting, detection, spectrum imaging and stealthy technology.