Control of absorption properties of ultra-thin metal–insulator–metal metamaterial terahertz absorbers

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

Publisher

IOP Publishing

Subject

General Physics and Astronomy,Physics and Astronomy (miscellaneous),General Engineering

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