TY - JOUR
T1 - The optimization method with segmenting iteration strategy for a long-wavelength infrared metalens
AU - Gu, Tianqi
AU - Cai, Hangbin
AU - Xu, Yongjia
AU - Tang, Dawei
AU - Luo, Tianzhi
N1 - Funding Information:
This work was supported by the National Natural Science Foundation of China (Grant No. 51605094 and 11572316 ), Anhui province science and technology major project (Grant No. 201903a07020019 ), and the Natural Science Foundation of Fujian Province (Grant No. 2021J01562 ). The authors would also like to thank Prof. Xiangqian Jiang, Center for Precision Technologies for her support in this work.
Publisher Copyright:
© 2023
PY - 2023/11/1
Y1 - 2023/11/1
N2 - Over the past several years, there has been a substantial surge in the utilization of metasurfaces in micro-electronics and micro-optical devices. As one of their applications, metalenses have aroused significant research interest. In this paper, a new optimization method based on micro co-fluctuation model is proposed to optimize the initial metalens for better focusing performance by adjusting the structural dimensions of nanopillars. A segmenting iteration strategy is used to legitimately reduce the computation space. Meanwhile, an improved Harris Hawks Optimizer (IHHO) is proposed to obtain the optimal solutions, in which a new formula for escape energy is defined to promote the diversity of solution space. The optimization results indicate that the proposed optimization method effectively enhances the focusing capability of the initial metalens with a numerical aperture (NA) of about 0.7 and an operating wavelength of 10.6 μm. The maximum field intensity of the central hot spot and the absolute efficiency have increased by approximately 59.02% and 71.13%, respectively, and the full width at half maximum (FWHM) remains nearly the same value, which provides the potential for achieving high-contrast imaging.
AB - Over the past several years, there has been a substantial surge in the utilization of metasurfaces in micro-electronics and micro-optical devices. As one of their applications, metalenses have aroused significant research interest. In this paper, a new optimization method based on micro co-fluctuation model is proposed to optimize the initial metalens for better focusing performance by adjusting the structural dimensions of nanopillars. A segmenting iteration strategy is used to legitimately reduce the computation space. Meanwhile, an improved Harris Hawks Optimizer (IHHO) is proposed to obtain the optimal solutions, in which a new formula for escape energy is defined to promote the diversity of solution space. The optimization results indicate that the proposed optimization method effectively enhances the focusing capability of the initial metalens with a numerical aperture (NA) of about 0.7 and an operating wavelength of 10.6 μm. The maximum field intensity of the central hot spot and the absolute efficiency have increased by approximately 59.02% and 71.13%, respectively, and the full width at half maximum (FWHM) remains nearly the same value, which provides the potential for achieving high-contrast imaging.
KW - Harris Hawks Optimizer
KW - High-contrast imaging
KW - Metalens
KW - Optimization design
KW - Waveguiding effect
UR - http://www.scopus.com/inward/record.url?scp=85168757364&partnerID=8YFLogxK
U2 - 10.1016/j.optcom.2023.129839
DO - 10.1016/j.optcom.2023.129839
M3 - Article
AN - SCOPUS:85168757364
VL - 546
JO - Optics Communications
JF - Optics Communications
SN - 0030-4018
M1 - 129839
ER -