Design of an ultra-broadband absorber based on plasma metamaterial and lumped resistors

• Published in: Optical materials express Vol. 8; no. 8; p. 2103
• Main Authors: Zhang, Haifeng, Yang, Jing, Zhang, Hao, Liu, Jiaxuan
• Format: Journal Article
• Language: English
• Published: Washington Optical Society of America 01-08-2018
• Subjects: Absorbers; Absorption spectra; Broadband; Metamaterials; Plasma resonance; Reflectance; Resistors; Wave reflection
• ISSN: 2159-3930; 2159-3930
• DOI: 10.1364/OME.8.002103

An electromagnetic absorber is realized based on the plasma metamaterial and lumped resistors. For a TE wave, the tunable absorption spectra can be obtained, and the properties of absorption can be improved by exciting the different plasma resonance structures. The proposed absorber can work in S, L and C bands, which is covered at 1.6115-4.0798 GHz (absorption rate is larger than 0.9), and its relative bandwidth is 86.7%. However, for a TM wave, the reflection coefficient is near to 1. The proposed electromagnetic absorber not only can realize the ultra-broadband absorption for the TE wave, but also can act as a reflector for the TM wave. A polarization splitter can be realized by such an absorber.