Back to Search
Start Over
High-NA Achromatic Metalenses by Inverse Design
- Source :
- Opt. Express 28, 6945-6965 (2020)
- Publication Year :
- 2019
-
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.
- Subjects :
- Physics - Optics
Subjects
Details
- Database :
- arXiv
- Journal :
- Opt. Express 28, 6945-6965 (2020)
- Publication Type :
- Report
- Accession number :
- edsarx.1905.09213
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1364/OE.385440