Abstract

In the past few decades, there has been significant progress made in metasurfaces and integrated and miniaturized optical devices. As one of the most prominent applications of metasurfaces, the metalens is the subject of significant research. In this paper, for achieving better focusing performance of the initial metalens designed by the Pancharatnam–Berry (PB) phase, a concept of micro-dimensional oscillation is proposed to optimize the geometric parameters of nanopillars. A strategy of grouping iteration is proposed to reduce the loss rate and computational effort in a holistic way. Its essence is to divide an extremely large-scale optimization space into many overlapping groups. Meanwhile, an improved genetic-simulated annealing (IGSA) algorithm is presented for the optimal solution of each group. By introducing the adaptive crossover and mutation probabilities in traditional genetic algorithms, the IGSA algorithm has both strong global searching capability and excellent local searching capability. After optimization, the maximum field intensity of the central hot spot can be increased by about 8% compared to the initial metalens. Moreover, the field intensity of the side lobes around the hot spot is almost constant, and the central hot spot increases, which provides a potential for the realization of high imaging contrast.

© 2022 Optica Publishing Group

Inverse design of a near-infrared metalens with an extended depth of focus based on double-process genetic algorithm optimization

Siyang Xiao, Fen Zhao, Dongying Wang, Junjie Weng, Yan Wang, Xin He, Huan Chen, Zhaojian Zhang, Yang Yu, Zhenfu Zhang, Zhenrong Zhang, and Junbo Yang
Opt. Express 31(5) 8668-8681 (2023)

Mid-infrared large-aperture metalens design verification and double-layer micro-optical system optimization

Weilin He, Lei Xin, Zhongming Yang, Wei Li, Zuojia Wang, and Zhaojun Liu
Opt. Mater. Express 14(5) 1321-1335 (2024)

Broadband achromatic polarization-insensitive metalens in the mid-wave infrared range

Yao Xie, Jianqi Zhang, Shiyu Wang, Delian Liu, and Xin Wu
Appl. Opt. 61(14) 4106-4112 (2022)

Imaging performance of a mid-infrared metalens with a machining error

Xinlei Ma, Weilin He, Lei Xin, Zhongming Yang, and Zhaojun Liu
Appl. Opt. 61(1) 60-68 (2022)

Helicity-dependent continuous varifocal metalens based on bilayer dielectric metasurfaces

Yanqun Wang, Li Chen, Shiwei Tang, Peipeng Xu, Fei Ding, Zhuoran Fang, and Arka Majumdar
Opt. Express 29(24) 39461-39472 (2021)