Reconfigurable all-dielectric metalens with diffraction-limited performance
| Autor: | Vladimir Liberman, Peter Su, Myungkoo Kang, Christopher Roberts, Mikhail Y. Shalaginov, Clara Rivero-Baleine, Carlos Ríos, Juejun Hu, Qingyang Du, Sensong An, Tian Gu, Yifei Zhang, Hualiang Zhang, Kathleen Richardson, Anuradha M. Agarwal, Fan Yang, Jeffrey B. Chou, Clayton Fowler |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Diffraction
Computer science Science Phase (waves) FOS: Physical sciences General Physics and Astronomy Applied Physics (physics.app-ph) 02 engineering and technology 01 natural sciences Electro-optics Article General Biochemistry Genetics and Molecular Biology 010309 optics 0103 physical sciences Electronic engineering Multidisciplinary business.industry Metamaterial Physics - Applied Physics General Chemistry 021001 nanoscience & nanotechnology Optical phenomena Metamaterials Contrast ratio Photonics 0210 nano-technology business Electron-beam lithography Optics (physics.optics) Sub-wavelength optics Physics - Optics |
| Zdroj: | Nature Communications, Vol 12, Iss 1, Pp 1-8 (2021) Nature Communications |
| ISSN: | 2041-1723 |
| Popis: | 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. Here, the authors report an active all-dielectric metasurface platform based on phase change materials, combining phase tuning in the full 2π range, and demonstrate aberration-free and multi-depth imaging with a non-mechanical tunable metalens. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|