Reconfigurable all-dielectric metalens with diffraction-limited performance
Abstract
Active metasurfaces, whose optical properties can be modulated post-fabrication, have emerged as an intensively explored field in recent years. The efforts to date, however, still face major performance limitations in tuning range, optical quality, and efficiency, especially for non-mechanical actuation mechanisms. In this paper, we introduce an active metasurface platform combining phase tuning in the full 2π range and diffraction-limited performance using an all-dielectric, low-loss architecture based on optical phase change materials (O-PCMs). We present a generic design principle enabling binary switching of metasurfaces between arbitrary phase profiles and propose a new figure-of-merit (FOM) tailored for reconfigurable meta-optics. We implement the approach to realize a high-performance varifocal metalens operating at 5.2 μm wavelength. The reconfigurable metalens features a record large switching contrast ratio of 29.5 dB. We further validate aberration-free and multi-depth imaging using the metalens, which represents a key experimental demonstration of a non-mechanical tunable metalens with diffraction-limited performance.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Feb 22, 2021
- Source ID
- 10.1038/s41467-021-21440-9
Entities
People
- Anu Agarwal
- Carlos Ríos
- Christopher Roberts
- Clara Rivero-baleine
- Clayton Fowler
- Fan Yang
- Hualiang Zhang
- Jeffrey B. Chou
- Juejun Hu
- Kathleen A. Richardson
- Mikhail Y Shalaginov
- Myungkoo Kang
- Peter Su
- Qingyang Du
- Sensong An
- Tian Gu
- Vladimir Liberman
- Yifei Zhang
Organizations
- United States Department of Defense