A dual-band mid-infrared polarization-insensitive perfect absorber

IF 2.9 3区化学 Q3 CHEMISTRY, PHYSICAL

Physical Chemistry Chemical Physics Pub Date : 2025-04-30 DOI:10.1039/d5cp01142f

Sijing Huang, Mousu Wan, Mingli Sun, Lin Lu, Xiaogang Wang, Bijun Xu

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Abstract

We propose a dual-band mid-infrared polarization-insensitive perfect absorber utilizing a cross-shaped indium antimonide (InSb) metasurface. The absorber comprises a multilayer structure with an InSb cross-shaped thin film, dielectric layers (Si₃N₄ and Al₂O₃), and a titanium reflective substrate. Through finite-difference time-domain (FDTD) simulations, the optimized design achieves near-perfect absorption efficiencies of 99.3% and 99.8% at wavelengths of 4.91 μm and 5.94 μm, respectively, under normal incidence. Impedance matching theory and multipole decomposition reveal that the dual-band absorption is primarily contributed by electric dipole (ED) and magnetic dipole (MD) resonances. Crucially, the four-fold symmetry of the cross-shaped InSb layer ensures polarization insensitivity, with absorption spectra overlapping perfectly for transverse electric (TE) and transverse magnetic (TM) modes. Due to its simple design and ease of fabrication, the absorber can be widely applied in various fields, including infrared imaging, optical communication, gas detection, and thermal radiation control, offering new possibilities for the advancement of related technologies.

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双波段中红外偏振不敏感的完美吸收器

我们提出了一种利用十字形锑化铟（InSb）超表面的双波段中红外偏振不敏感完美吸收器。该吸收器包括具有InSb十字形薄膜的多层结构、介电层（Si3N4和Al2O3）和钛反射衬底。通过时域有限差分（FDTD）仿真，优化设计在4.91 μm波长和5.94 μm波长处的吸收效率分别达到99.3%和99.8%，接近完美。阻抗匹配理论和多极分解表明，双波段吸收主要由电偶极子（ED）和磁偶极子（MD）共振贡献。至关重要的是，十字形InSb层的四重对称性确保了极化不敏感，横向电（TE）和横向磁（TM）模式的吸收光谱完美重叠。由于其设计简单，易于制造，可广泛应用于红外成像，光通信，气体检测和热辐射控制等各个领域，为相关技术的进步提供了新的可能性。

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来源期刊

Physical Chemistry Chemical Physics 化学-物理：原子、分子和化学物理

CiteScore

5.50

自引率

9.10%

发文量

2675

审稿时长

2.0 months

期刊介绍： Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.