High-NA achromatic metalenses by inverse design
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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Feb 24, 2020
- Source ID
- 10.1364/oe.385440
Entities
People
- Haejun Chung
- Owen Miller
Organizations
- Air Force Office of Scientific Research