https://doi.org/10.1051/epjam/2024001
Research Article
Design method for large-scale wide field-of-view monochromatic metalenses
Sony Semiconductor Solutions Corporation, Research Division 3, 4-14-1 Asahi-cho Atsugi-shi, 243-0014, Kanagawa, Japan
* e-mail: Hiroyuki.Tahara@sony.com
Received:
30
September
2023
Accepted:
27
December
2023
Published online: 11 April 2024
We propose a novel design method for wide field-of-view monochromatic metalenses. The proposed technique partitions the outer region of a metalens into supercells, which are generated by dividing the outer region into intervals along the radial direction, where the target phase changes by 2π, and along the angular direction with a constant angular periodicity. Therefore, the shape of each supercell can be approximated as a rectangle with its size comparable to a wavelength. The arrangement of pillars within this supercell is determined by metagrating optimization via the adjoint method. The optimization process considers both inter-pillar couplings and the range of incidence angles. This makes the design of large-scale wide field-of-view high-efficiency metalenses more tractable than the conventional unit-cell-based method, which is prone to efficiency decrease especially near the lens periphery. Furthermore, it has a potential advantage in terms of computational cost over other recently proposed optimization-based methods.
Key words: Metasurface / metalens / metagrating
© H. Tahara and T. Yasui, Published by EDP Sciences, 2024
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
