3D Printed Multilayer Structures for High Numerical Aperture Achromatic Metalenses
Abstract
Flat optics consisting of nanostructures of high-refractive-index materials produce lenses with thin form factors that tend to operate only at specific wavelengths. Recent attempts to achieve achromatic lenses uncover a trade-off between the numerical aperture (NA) and bandwidth, which limits performance. Here we propose a new approach to design high NA, broadband and polarization-insensitive multilayer achromatic metalenses (MAM). We combine topology optimization and full wave simulations to inversely design MAMs and fabricate the structures in low-refractive-index materials by two-photon polymerization lithography. MAMs measuring 20 micrometer in diameter operating in the visible range of 400-800 nm with 0.5 NA and 0.7 NA were achieved with efficiencies of up to 42%. We demonstrate broadband imaging performance of the fabricated MAM under white light, and RGB narrowband illuminations. These results highlight the potential of the 3D printed multilayer structures for realizing broadband and multi-functional meta-devices with inverse design.
Cite
@article{arxiv.2308.14051,
title = {3D Printed Multilayer Structures for High Numerical Aperture Achromatic Metalenses},
author = {Cheng-Feng Pan and Hao Wang and Hongtao Wang and Parvathi Nair S and Qifeng Ruan and Simon Wredh and Yujie Ke and John You En Chan and Wang Zhang and Cheng-Wei Qiu and Joel K. W. Yang},
journal= {arXiv preprint arXiv:2308.14051},
year = {2023}
}
Comments
37 pages, 15 figures