Reconfigurable all-dielectric metalens with diffraction-limited performance.

Reconfigurable all-dielectric metalens with diffraction-limited performance.
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DOI:
10.1038/s41467-021-21440-9
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发表时间:
2021-02-22
影响因子:
16.6
通讯作者:
Gu T
Gu T
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Shalaginov MY;An S;Zhang Y;Yang F;Su P;Liberman V;Chou JB;Roberts CM;Kang M;Rios C;Du Q;Fowler C;Agarwal A;Richardson KA;Rivero-Baleine C;Zhang H;Hu J;Gu T

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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.
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