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A dual-band mid-infrared polarization-insensitive perfect absorber
Sijing Huang1, Mousu Wan1, Mingli Sun1
1School of Science, Zhejiang University of Science and Technology, Hangzhou, China. xubijun@zust.edu.cn.
Physical Chemistry Chemical Physics : PCCP
|April 30, 2025
Summary
We developed a dual-band mid-infrared perfect absorber using a cross-shaped indium antimonide (InSb) metasurface. This polarization-insensitive device achieves near-perfect absorption, ideal for advanced infrared applications.
Area of Science:
- Metamaterials
- Plasmonics
- Nanophotonics
Background:
- Perfect absorbers are crucial for controlling light-matter interactions.
- Mid-infrared applications require efficient and polarization-insensitive absorption.
Purpose of the Study:
- To design and simulate a dual-band, polarization-insensitive perfect absorber in the mid-infrared spectrum.
- To investigate the absorption mechanisms and potential applications of the proposed device.
Main Methods:
- Utilizing finite-difference time-domain (FDTD) simulations.
- Employing impedance matching theory and multipole decomposition.
- Designing a cross-shaped indium antimonide (InSb) metasurface with dielectric layers and a titanium substrate.
Main Results:
- Achieved near-perfect absorption efficiencies of 99.3% and 99.8% at 4.91 μm and 5.94 μm.
- Demonstrated polarization insensitivity due to the metasurface's four-fold symmetry.
- Identified electric dipole (ED) and magnetic dipole (MD) resonances as primary contributors to dual-band absorption.
Conclusions:
- The proposed InSb metasurface absorber offers a simple yet effective solution for dual-band mid-infrared absorption.
- Its polarization-insensitive nature and high efficiency enable diverse applications in infrared imaging, sensing, and communication.
- This work paves the way for advanced optical devices in the mid-infrared range.
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