Design and optimization method of chiral metasurfaces with structural discretization and genetic algorithms

Yue Wang; Chinhua Wang

doi:10.1117/12.3039206

13 September 2024 Design and optimization method of chiral metasurfaces with structural discretization and genetic algorithms

Yue Wang, Chinhua Wang

Author Affiliations +

Proceedings Volume 13254, Fourth International Conference on Optics and Image Processing (ICOIP 2024); 132540L (2024) https://doi.org/10.1117/12.3039206
Event: Fourth International Conference on Optics and Image Processing (ICOIP 2024), 2024, Chongqing, China

Abstract

Metasurfaces including chiral metasurfaces have attracted extensive attention due to their ability to flexibly manipulate various parameters of light fields, such as amplitude, phase and polarization, based on the subwavelength-scale structures. However, conventional design and optimization of a 2D metasurface usually rely on experience-driven and time-consuming trial-and-error procedure for searching effective structures and the followed case-by-case optimization, in which the structures are usually limited to simple and regular geometries. Here, we propose a design and optimization method of chiral metasurfaces with the combination of structural discretization and genetic algorithms. Based on the proposed method, design and optimization of a broadband chiral metasurface working in the visible wavelength region was conducted with an arbitrarily given C-2 symmetric structure without complicated structural searching and time-consuming optimization process. Simulation results show that an average circular dichroism of 0.73 (peaking at 0.88) and an average circular polarization extinction ratio (CPER) of 11.5 dB (up to 27.4 dB) can be obtained in the wavelength range spans from 605 nm to 720 nm. This proposed method provides a new approach for the design and optimization of chiral metasurfaces or other metasurfaces.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Yue Wang and Chinhua Wang "Design and optimization method of chiral metasurfaces with structural discretization and genetic algorithms", Proc. SPIE 13254, Fourth International Conference on Optics and Image Processing (ICOIP 2024), 132540L (13 September 2024); https://doi.org/10.1117/12.3039206

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