High-NA Achromatic Metalenses by Inverse Design
Optics
2020-05-11 v1
Abstract
We use inverse design to discover metalens structures that exhibit broadband, achromatic focusing across low, moderate, and high numerical apertures. We show that standard unit-cell approaches cannot achieve high-efficiency high-NA focusing, even at a single frequency, due to the incompleteness of the unit-cell basis, and we provide computational upper bounds on their maximum efficiencies. At low NA, our devices exhibit the highest theoretical efficiencies to date. At high NA -- of 0.9 with translation-invariant films and of 0.99 with "freeform" structures -- our designs are the first to exhibit achromatic high-NA focusing.
Keywords
Cite
@article{arxiv.1905.09213,
title = {High-NA Achromatic Metalenses by Inverse Design},
author = {Haejun Chung and Owen D. Miller},
journal= {arXiv preprint arXiv:1905.09213},
year = {2020}
}