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Design of Metasurface-Based Multi-layer THz Filters Utilizing Optimization Algorithm with Distinct Fitness Function Definitions

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Abstract

In this paper, an evolutionary optimization procedure is presented to generate band-pass metasurface-based filters in terahertz regime. As a measure of novelty, pass-band, transition, and out-band characteristics are investigated separately, all of which result in different metasurfaces for filtering applications. The presented approach is defined based on random hill climbing algorithm, regarding the established link between Matlab and HFSS software. A metasurface-based filter with specific properties is considered as the main problem to be solved by the optimization method. Moreover, the fuzzy theory, mean square method, and weighting coefficient procedure are considered to define an efficient fitness function evaluation approach. Also, a step-by-step procedure is used to generate desired structures with a great note of efficiency. The final generated structure has magnificent characteristics including sharp transitions together with transmittance around 0.68 and less than 0.04 at pass-band and out-band regions, respectively. Also, the generated metasurface benefits from wide bandwidth (65%) and great compactness compared to other previous works.

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Authors and Affiliations

  1. Department of Electrical Engineering, Shiraz University of Technology, Shiraz, Iran

    Hamed Mohammadi Nemat-Abad, Ehsan Zareian-Jahromi & Raheleh Basiri

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  1. Hamed Mohammadi Nemat-Abad
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  2. Ehsan Zareian-Jahromi
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  3. Raheleh Basiri
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All authors have participated in preparing the manuscript.

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Correspondence to Ehsan Zareian-Jahromi.

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Nemat-Abad, H.M., Zareian-Jahromi, E. & Basiri, R. Design of Metasurface-Based Multi-layer THz Filters Utilizing Optimization Algorithm with Distinct Fitness Function Definitions. Plasmonics 16, 1865–1876 (2021). https://doi.org/10.1007/s11468-021-01450-5

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