Design and simulation of achromatic metalens based on topology optimization

Zhao Jin; Chengmiao Wang; Yongbo Deng; Huilin Jiang

doi:10.1117/12.3017393

15 December 2023 Design and simulation of achromatic metalens based on topology optimization

Zhao Jin, Chengmiao Wang, Yongbo Deng, Huilin Jiang

Proceedings Volume 12971, Third International Conference on Optics and Communication Technology (ICOCT 2023); 1297106 (2023) https://doi.org/10.1117/12.3017393
Event: Third International Conference on Optics and Communication Technology (ICOCT 2023), 2023, Changchun, China

Abstract

In this paper, we propose a novel reverse design method using topology optimization for the overall structure of a rotationally symmetric concentric nanoring metalens with a continuously variable height. The optimize objective is to maximize the focal field intensity of a predetermined numerical aperture lens. Compared to nano-pillar array structures and single thickness structures, this approach offers advantages in terms of high design flexibility in phase distribution and superior imaging performance. Leveraging the rotational symmetry inherent in concentric nanorings, a combined methodology of near-field electromagnetic simulations and far-field calculations is employed to verify the two-dimensional optical field characteristics. This method significantly improves computational efficiency compared to full-wave simulations in three-dimensional optical fields, as it reduces simulation time and has lower CPU requirements without compromising accuracy. The simulation results demonstrate that the designed continuous variable height concentric nanoring metalens achieves imaging close to the diffraction limit within the visible light range (400-700 nm).

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

Citation Download Citation

Zhao Jin, Chengmiao Wang, Yongbo Deng, and Huilin Jiang "Design and simulation of achromatic metalens based on topology optimization", Proc. SPIE 12971, Third International Conference on Optics and Communication Technology (ICOCT 2023), 1297106 (15 December 2023); https://doi.org/10.1117/12.3017393

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KEYWORDS

Design and modelling

Near field optics

Free space

Incident light

Tunable filters

Electric fields

Nanostructures

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