Reconfigurable all-dielectric metalens for diffraction-limited imaging

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; Tian Gu

doi:10.1117/12.2565267

20 August 2020 Reconfigurable all-dielectric metalens for diffraction-limited imaging

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, Tian Gu

Author Affiliations +

Proceedings Volume 11461, Active Photonic Platforms XII; 114610M (2020) https://doi.org/10.1117/12.2565267
Event: SPIE Nanoscience + Engineering, 2020, Online Only

Abstract

Optical metasurfaces, planar sub-wavelength nano-antenna arrays with the singular ability to sculpt wave front in almost arbitrary manners, are poised to become a powerful tool enabling compact and high-performance optics with novel functionalities. A particularly intriguing research direction within this field is active metasurfaces, whose optical response can be dynamically tuned post-fabrication, thus allowing a plurality of applications unattainable with traditional bulk optics. 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 covering 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. We implement the approach to realize a high-performance varifocal metalens. The metalens is constructed using Ge₂Sb₂Se₄Te₁ (GSST), an O-PCM with a large refractive index contrast and unique broadband low-loss characteristics in both amorphous and crystalline states. The reconfigurable metalens features focusing efficiencies above 20% at both states for linearly polarized light and a record large switching contrast ratio (CR) close to 30 dB. We further validate aberration-free and multi-depth imaging using the metalens, which represents the first experimental demonstration of a non-mechanical active metalens with diffraction-limited performance.

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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 "Reconfigurable all-dielectric metalens for diffraction-limited imaging", Proc. SPIE 11461, Active Photonic Platforms XII, 114610M (20 August 2020); https://doi.org/10.1117/12.2565267

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