| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Angular insensitive nonreciprocal ultrawide band absorption in plasma-embedded photonic crystals designed with improved particle swarm optimization algorithm |
| Yi-Han Wang(王奕涵)1 and Hai-Feng Zhang(章海锋)2,† |
1 Bell Honors School of Nanjing University of Posts and Telecommunication, Nanjing 210023, China;
2 College of Electronic and Optical Engineering&College of Flexible Electronics, Nanjing University of Posts and Telecommunications, Nanjing 210023, China |
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Abstract Using an improved particle swarm optimization algorithm (IPSO) to drive a transfer matrix method, a nonreciprocal absorber with an ultrawide absorption bandwidth and angular insensitivity is realized in plasma-embedded photonic crystals arranged in a structure composed of periodic and quasi-periodic sequences on a normalized scale. The effective dielectric function, which determines the absorption of the plasma, is subject to the basic parameters of the plasma, causing the absorption of the proposed absorber to be easily modulated by these parameters. Compared with other quasi-periodic sequences, the Octonacci sequence is superior both in relative bandwidth and absolute bandwidth. Under further optimization using IPSO with 14 parameters set to be optimized, the absorption characteristics of the proposed structure with different numbers of layers of the smallest structure unit N are shown and discussed. IPSO is also used to address angular insensitive nonreciprocal ultrawide bandwidth absorption, and the optimized result shows excellent unidirectional absorbability and angular insensitivity of the proposed structure. The impacts of the sequence number of quasi-periodic sequence M and collision frequency of plasma1 ν1 to absorption in the angle domain and frequency domain are investigated. Additionally, the impedance match theory and the interference field theory are introduced to express the findings of the algorithm.
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Received: 21 April 2022
Revised: 30 June 2022
Accepted manuscript online: 12 August 2022
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PACS:
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42.70.Qs
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(Photonic bandgap materials)
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45.10.Db
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(Variational and optimization methods)
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94.30.ct
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(Plasma sheet)
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Corresponding Authors:
Hai-Feng Zhang
E-mail: hanlor@163.com,hanlor@njupt.edu.cn
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Cite this article:
Yi-Han Wang(王奕涵) and Hai-Feng Zhang(章海锋) Angular insensitive nonreciprocal ultrawide band absorption in plasma-embedded photonic crystals designed with improved particle swarm optimization algorithm 2023 Chin. Phys. B 32 044207
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