Author:
Niu Tianye,Qiu Boqi,Zhang Ya,Hirakawa Kazuhiko
Abstract
Abstract
We have systematically investigated the absorption spectra of ultra-thin metal–insulator–metal (MIM) metamaterial absorbers (MMAs) as a function of the insulator thickness, h. Absorption over 90% is obtained when h is optimized. Furthermore, we have found that, when the insulator thickness is increased, the resonance frequency first increases rapidly and, then, shows a gradual red-shift. As a result, the resonance frequency has a bell-shaped dependence on h. To explain the observed dependence, we provide an intuitive, analytical theory and show that the bell-shaped dispersion curve in the MIM MMA structure originates from the transition from the TM0 plasmonic mode to the vertical Fabry–Perot mode.
Funder
Murata Science Foundation
Ministry of Education, Culture, Sports, Science and Technology
Precise Measurement Technology Promotion Foundation
Mitsubishi Foundation
Japan Society for the Promotion of Science
Collaborative Research Based on Industrial Demand
Subject
General Physics and Astronomy,Physics and Astronomy (miscellaneous),General Engineering
Cited by
7 articles.
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