Ultra-wide angle metalens design with ray-based and wave-based tools

Li-Ce Hu; Yijun Ding

doi:10.1117/12.2686361

28 November 2023 Ultra-wide angle metalens design with ray-based and wave-based tools

Li-Ce Hu, Yijun Ding

Proceedings Volume 12765, Optical Design and Testing XIII; 127650D (2023) https://doi.org/10.1117/12.2686361
Event: SPIE/COS Photonics Asia, 2023, Beijing, China

Abstract

Designing a metalens of millimeter scale or larger is challenging. We demonstrate how to combine a ray-based automatic design tool with a wave-based inverse design tool to design a mm-size ultra-wide angle metalens imaging system. The ray-based approach parametrizes the distribution of meta-atom design parameters over the surface with a polynomial, and treat the metalens similarly to a grating. The ray-based design tool considers both the transmission and the phase of the meta-atoms as functions of the incident angle. The ray-based approach is fast and robust. It can complete the optimization of a mm-size metalens in a few minutes. This design can then serve as a starting point for a wave-based inverse design tool. The wave-based inverse design tool is applied to further optimize the metalens with arbitrary distribution of meta-atom design parameters. The additional design freedom offered by the arbitrary distribution further increases the light collection efficiency and image resolution. Finally, the design performance is validated with a finite difference time domain (FDTD) algorithm. All analysis results agree well, show that the final ultra-wide angle metalens design is close to diffraction limited. These results demonstrate the effectiveness of our proposed workflow by taking advantage of both the ray-based and the wave-based design tools.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Li-Ce Hu and Yijun Ding "Ultra-wide angle metalens design with ray-based and wave-based tools", Proc. SPIE 12765, Optical Design and Testing XIII, 127650D (28 November 2023); https://doi.org/10.1117/12.2686361

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KEYWORDS

Design and modelling

Finite-difference time-domain method

Code v

Modulation transfer functions

Geometrical optics

Optical transmission

Metalenses

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