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9 September 2022 An ultra-broadband nearly-perfect absorber in multilayered nanocircular disk and nanoelliptic disk structure
Ling Guo, MinFang Shi, Yajie Liu, Mengran Guo, Jun Ma
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Proceedings Volume 12328, Second International Conference on Optics and Image Processing (ICOIP 2022); 123280H (2022) https://doi.org/10.1117/12.2644302
Event: Second International Conference on Optics and Image Processing (ICOIP 2022), 2022, Taian, China
Abstract
In this paper, a kind of absorber based on local surface plasmon resonances is designed by using the finite difference time domain (FDTD) method. The absorber can realize the nearly perfect absorption from visible light to the near-infrared wavelength. The absorber consists of the bottom metal tungsten (W) as substrate, the middle dielectric layer aluminum oxide (Al2O3), and the multilayered nanocircular disk and nanoelliptic disk. The four layered nanodisk structure materials are Ti- Al2O3 -Ti- Al2O3, and these nanodisks are periodically and symmetrically arranged. Numerical analysis shows that the average absorption rate of the absorber can reach 97.2% in the working band of 426~1947nm, and the absorption bandwidth is 1521nm. By analyzing the electromagnetic field distribution of the resonant wavelength, it can be seen that characteristics of the ultra-broadband and high absorption in the absorber are attributed to the local surface plasmon resonance (LSPR). This kind of absorber with ultra-broad band and high absorption absorber is expected to play an important role in photoelectric devices, solar energy collection and other fields.
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Ling Guo, MinFang Shi, Yajie Liu, Mengran Guo, and Jun Ma "An ultra-broadband nearly-perfect absorber in multilayered nanocircular disk and nanoelliptic disk structure", Proc. SPIE 12328, Second International Conference on Optics and Image Processing (ICOIP 2022), 123280H (9 September 2022); https://doi.org/10.1117/12.2644302
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KEYWORDS
Absorption
Aluminum
Magnetism
Multilayers
Tungsten
Finite-difference time-domain method
Surface plasmons
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