High-NA achromatic metalenses by inverse design
- Authors
- Chung, Haejun; Miller Owen D.
- Issue Date
- Mar-2020
- Publisher
- OPTICAL SOC AMER
- Citation
- OPTICS EXPRESS, v.28, no.5, pp.6945 - 6965
- Indexed
- SCIE
SCOPUS
- Journal Title
- OPTICS EXPRESS
- Volume
- 28
- Number
- 5
- Start Page
- 6945
- End Page
- 6965
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/190709
- DOI
- 10.1364/OE.385440
- ISSN
- 1094-4087
- 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.
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