Abstract
We theoretically investigate a metasurface perfect absorber based on indium-tin-oxide as active material. Our design scheme relies on conventional metal–oxide–semiconductor model and the Drude model. Inducing a voltage into the device causes a blue-shift of 50 nm in the reflectance spectrum in the infrared region. The total thickness of the device is only 3.5% of the working wavelength λ = 2.56 μm, and the rate of reflectance change reaches 5.16 at λ = 2.56 μm. Because the material that we use has advantages of easy fabrication and fast response, our design approach can be used for numerous applications on active plasmonic sensors and filters.
Highlights
We theoretically investigate a metasurface perfect absorber based on indium-tin-oxide as active material
Compared to conventional absorption devices based on multi-layered thin films, the Metasurface perfect absorbers (MPAs) is very thin, usually less than one wavelength
*Correspondence: jsrho@postech.ac.kr †Gwanho Yoon and Sunae So contributed to the work 1 Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea Full list of author information is available at the end of the article method exploits the effect of carrier concentration on the optical properties of materials; this approach controls the optical functionality of the device by applying a voltage
Summary
We theoretically investigate a metasurface perfect absorber based on indium-tin-oxide as active material. Compared to conventional absorption devices based on multi-layered thin films, the MPA is very thin, usually less than one wavelength. *Correspondence: jsrho@postech.ac.kr †Gwanho Yoon and Sunae So contributed to the work 1 Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea Full list of author information is available at the end of the article method exploits the effect of carrier concentration on the optical properties of materials; this approach controls the optical functionality of the device by applying a voltage.
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