Multiple-band terahertz perfect light absorbers enabled by using multiple metallic bars
- 19 February 2021
- journal article
- research article
- Published by IOP Publishing in Physica Scripta
- Vol. 96 (5), 055502
- https://doi.org/10.1088/1402-4896/abe830
Abstract
Triple-band terahertz metamaterial absorber with near 100% absorption is suggested in this paper. It is designed by two different lengths of Au bars and an Au substrate separated by an ultra-thin thickness of dielectric spacer. Three separated resonance absorption peaks (labeled A, B, and C) with narrow bandwidths and high absorption rates are realized. The first two peaks A and B are ascribed to the fundamental modes of the two Au bars, respectively, whereas the excitation of 3-order response in the longer Au bar results in the peak C. The field distributions of peaks A, B, and C are provided to verify their mechanisms. Independent frequency modulation of the three peaks (with slight change of absorption strength) can also be achieved, which is different from previous works that changes in parameters affect all absorption peaks. Further structure optimization allows for more absorption peaks, such as quad-band or penta-band. These suggested light absorbers could be designed for potential applications in terahertz technology related fields.Keywords
This publication has 50 references indexed in Scilit:
- Graphene based metasurface with near unity broadband absorption in the terahertz gapInternational Journal of RF and Microwave Computer-Aided Engineering, 2020
- Multiple-band terahertz metamaterial filter using coupling effect of U-type resonator and two same sizes of metallic split ringsMaterials Research Express, 2019
- Multiple-band light absorber via combining the fundamental mode and multiple splitting modes of the 3-order response of metamaterial resonatorJournal of Physics D: Applied Physics, 2017
- Super Absorbing Ultraviolet MetasurfaceIEEE Photonics Technology Letters, 2015
- Terahertz Metamaterials for Linear Polarization Conversion and Anomalous RefractionScience, 2013
- Polarization-Independent Plasmon-Induced Transparency in a Fourfold Symmetric Terahertz MetamaterialIEEE Journal of Selected Topics in Quantum Electronics, 2012
- Sharp Fano resonances in THz metamaterialsOptics Express, 2011
- Perfect Metamaterial AbsorberPhysical Review Letters, 2008
- Metamaterial Electromagnetic Cloak at Microwave FrequenciesScience, 2006
- Metamaterials and Negative Refractive IndexScience, 2004