Perfect metamaterial absorber based on the circular or elliptical cavity with one side open in the terahertz region

Xiaojie Lu, Zhongyin Xiao and Mingming Chen

Journal of Electromagnetic Waves and Applications, 2020, vol. 34, issue 10, 1460-1470

Abstract: In this work, we present the analysis and design of a perfect metamaterial absorber (MA) based on the circular cavity with one side open in the terahertz region. This structure consists of a metal plate where one circular cavity with one side open is vertically placed on. Based on the circular-cavity-theory, a formula can be used to calculate the resonant frequency. In terms of normal incidence, the simulated results show that the MA has one resonance point on 6.674 THz, which is consistent with the calculated results. What’s more, we present the distribution of E-field, surface current distribution and power loss density distribution in the cavity, and use the standing wave theory and electric dipole to prove the physical mechanism of the perfect absorption. Finally, an MA based on elliptical cavity with one side open is also studied. These results verify the application of resonant cavities in the field of MA.

Date: 2020
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DOI: 10.1080/09205071.2019.1676831

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