Abstract

A broadband metamaterial absorber with a single layer of tantalum nitride (${\mathrm{Ta}}_2{\mathrm{N}}_3$) frequency selective surface layer, printed on a foam substrate, is presented. The proposed design has been numerically examined at the terahertz region. The results have shown that a wideband absorption with absorptivity greater than 90% was achieved in the frequency range 1.17–2.99 THz, and the relative absorption bandwidth was up to 112.97%, which is significantly better than previously reported results. Moreover, the absorber was independent of wave polarization, and a high absorption for a wide range of oblique incidence was achieved. The surface current distribution, the electric field distributions, and the power loss analyses were used to explain the physical mechanism of a wideband absorption. However, the tantalum nitride layer has an important role in the energy absorption. According to the obtained results, the proposed absorber, which is compact and simple to design, has a potential application in evolving broadband terahertz absorbers and sensors.

© 2017 Optical Society of America

Investigation of a broadband refractory metal metamaterial absorber at terahertz frequencies

Dan Hu, Hongyan Wang, Zhenjie Tang, and Xiwei Zhang
Appl. Opt. 55(19) 5257-5262 (2016)

Wide-angle broadband terahertz metamaterial absorber with a multilayered heterostructure

Junxing Fan, Dong Xiao, Qiong Wang, Qiang Liu, and Zhengbiao Ouyang
Appl. Opt. 56(15) 4388-4391 (2017)

Broadband terahertz metamaterial absorber: design and fabrication

Yanqing Qiu, Jinfeng Wang, Meiyu Xiao, and Tingting Lang
Appl. Opt. 60(32) 10055-10061 (2021)

Tunable broadband all-silicon terahertz absorber based on a simple metamaterial structure

Tingting Lang, Tingting Shen, Gangqi Wang, and Changyu Shen
Appl. Opt. 59(21) 6265-6270 (2020)

Polarization-insensitive broadband terahertz metamaterial absorber based on hybrid structures

Yuying Lu, Jining Li, Shaohua Zhang, Jinhai Sun, and Jian Quan Yao
Appl. Opt. 57(21) 6269-6275 (2018)