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Volume 12
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10.3390/mi12050548
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Article

Dynamically Switchable Polarization-Independent Triple-Band Perfect Metamaterial Absorber Using a Phase-Change Material in the Mid-Infrared (MIR) Region

by
Dongdong Xu
1,
Fenping Cui
1 and
Gaige Zheng
1,2,*
1
Jiangsu Key Laboratory for Optoelectronic Detection of Atmosphere and Ocean, School of Physics and Optoelectronic Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China
2
Jiangsu Collaborative Innovation Center on Atmospheric Environment and Equipment Technology (CICAEET), Nanjing University of Information Science & Technology, Nanjing 210044, China
*
Author to whom correspondence should be addressed.
Micromachines 2021, 12(5), 548; https://doi.org/10.3390/mi12050548
Submission received: 22 April 2021 / Revised: 9 May 2021 / Accepted: 10 May 2021 / Published: 11 May 2021
(This article belongs to the Special Issue Miniature Optoelectronic Resonators and Oscillators)
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Abstract

A tunable metamaterial absorber (MMA) by reversible phase transitions in a mid-infrared regime is theoretically investigated. The absorber is composed of a molybdenum (Mo)-germanium-antimony-tellurium (Ge2Sb2Te5, GST)-Mo nanodisk structure superimposed on the GST-Al2O3 (aluminum oxide)-Mo film. Studies have shown that the combination of the inlaid metal-medium dielectric waveguide mode and the resonant cavity mode and the excitation of the propagating surface plasmon mode are the main reasons for the formation of the triple-band high absorption. Additionally, through the reversible phase change, the transition from high absorption to high reflection in the mid-infrared region is realized. The symmetry of the absorber eliminates the polarization dependence, and the near unity absorption efficiency can be maintained by incidence angles up to 60°. The presented method will enhance the functionality of the absorber and has the potential for the applications that require active control over light absorption.
Keywords: germanium-antimony-tellurium; triple-band absorber; mid-infrared regime; near unity absorption germanium-antimony-tellurium; triple-band absorber; mid-infrared regime; near unity absorption

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MDPI and ACS Style

Xu, D.; Cui, F.; Zheng, G. Dynamically Switchable Polarization-Independent Triple-Band Perfect Metamaterial Absorber Using a Phase-Change Material in the Mid-Infrared (MIR) Region. Micromachines 2021, 12, 548. https://doi.org/10.3390/mi12050548

AMA Style

Xu D, Cui F, Zheng G. Dynamically Switchable Polarization-Independent Triple-Band Perfect Metamaterial Absorber Using a Phase-Change Material in the Mid-Infrared (MIR) Region. Micromachines. 2021; 12(5):548. https://doi.org/10.3390/mi12050548

Chicago/Turabian Style

Xu, Dongdong, Fenping Cui, and Gaige Zheng. 2021. "Dynamically Switchable Polarization-Independent Triple-Band Perfect Metamaterial Absorber Using a Phase-Change Material in the Mid-Infrared (MIR) Region" Micromachines 12, no. 5: 548. https://doi.org/10.3390/mi12050548

APA Style

Xu, D., Cui, F., & Zheng, G. (2021). Dynamically Switchable Polarization-Independent Triple-Band Perfect Metamaterial Absorber Using a Phase-Change Material in the Mid-Infrared (MIR) Region. Micromachines, 12(5), 548. https://doi.org/10.3390/mi12050548

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