Genetic algorithm assisted meta-atom design for high-performance metasurface optics

• Published in: Opto-Electronic Science Vol. 3; no. 9; p. 240016
• Main Authors: Yu, Zhenjie, Li, Moxin, Xing, Zhenyu, Gao, Hao, Liu, Zeyang, Pu, Shiliang, Mao, Hui, Cai, Hong, Ma, Qiang, Ren, Wenqi, Zhu, Jiang, Zhang, Cheng
• Format: Journal Article
• Language: English
• Published: School of Optical and Electronic Information&Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology,Wuhan 430074,China%Hikvision Research Institute,Hangzhou 310051,China 01.09.2024; Editorial Office of Opto-Electronic Journals, Institute of Optics and Electronics, CAS, China
• Subjects: bessel beam; genetic algorithm; metahologram; metalens; metasurface; genetic algorithm; metalens; Bessel beam; metasurface; metahologram
• ISSN: 2097-0382
• DOI: 10.29026/oes.2024.240016

Metasurfaces,composed of planar arrays of intricately designed meta-atom structures,possess remarkable capabilities in controlling electromagnetic waves in various ways.A critical aspect of metasurface design involves selecting suitable meta-atoms to achieve target functionalities such as phase retardation,amplitude modulation,and polarization conver-sion.Conventional design processes often involve extensive parameter sweeping,a laborious and computationally inten-sive task heavily reliant on designer expertise and judgement.Here,we present an efficient genetic algorithm assisted meta-atom optimization method for high-performance metasurface optics,which is compatible to both single-and multi-objective device design tasks.We first employ the method for a single-objective design task and implement a high-effi-ciency Pancharatnam-Berry phase based metalens with an average focusing efficiency exceeding 80%in the visible spectrum.We then employ the method for a dual-objective metasurface design task and construct an efficient spin-multi-plexed structural beam generator.The device is capable of generating zeroth-order and first-order Bessel beams respec-tively under right-handed and left-handed circular polarized illumination,with associated generation efficiencies surpass-ing 88%.Finally,we implement a wavelength and spin co-multiplexed four-channel metahologram capable of projecting two spin-multiplexed holographic images under each operational wavelength,with efficiencies over 50%.Our work offers a streamlined and easy-to-implement approach to meta-atom design and optimization,empowering designers to create diverse high-performance and multifunctional metasurface optics.