Reconfigurable all-dielectric metalens with diffraction-limited performance

Mikhail Y. Shalaginov, Sensong An, Yifei Zhang, Fan Yang, Peter Su, Vladimir Liberman, Jeffrey B. Chou, Christopher M. Roberts, Myungkoo Kang, Carlos Rios, Qingyang Du, Clayton Fowler, Anuradha Agarwal, Kathleen A. Richardson, Clara Rivero-Baleine, Hualiang Zhang (), Juejun Hu () and Tian Gu ()
Additional contact information
Mikhail Y. Shalaginov: Massachusetts Institute of Technology
Sensong An: University of Massachusetts Lowell
Yifei Zhang: Massachusetts Institute of Technology
Fan Yang: Massachusetts Institute of Technology
Peter Su: Massachusetts Institute of Technology
Vladimir Liberman: Lincoln Laboratory, Massachusetts Institute of Technology
Jeffrey B. Chou: Lincoln Laboratory, Massachusetts Institute of Technology
Christopher M. Roberts: Lincoln Laboratory, Massachusetts Institute of Technology
Myungkoo Kang: University of Central Florida
Carlos Rios: Massachusetts Institute of Technology
Qingyang Du: Massachusetts Institute of Technology
Clayton Fowler: University of Massachusetts Lowell
Anuradha Agarwal: Massachusetts Institute of Technology
Kathleen A. Richardson: University of Central Florida
Clara Rivero-Baleine: Missiles and Fire Control, Lockheed Martin Corporation
Hualiang Zhang: University of Massachusetts Lowell
Juejun Hu: Massachusetts Institute of Technology
Tian Gu: Massachusetts Institute of Technology

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: 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.

Date: 2021
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DOI: 10.1038/s41467-021-21440-9

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