Varifocal Metalens Using Tunable and Ultralow-loss Dielectrics.

ABSTRACT: The field of flat optics that uses nanostructured, so-called metasurfaces, has seen remarkable progress over the last decade. Chalcogenide phase-change materials (PCMs) offer a promising platform for realizing reconfigurable metasurfaces, as their optical properties can be reversibly tuned. Yet, demonstrations of phase-change metalenses to date have employed material compositions such as Ge₂ Sb₂ Te₅ , which show high absorption in the visible to near-IR wavelengths particularly in their crystalline state, limiting the applicability. Here, by using a low-loss PCM Sb₂ Se₃ , for the first time, active polarization-insensitive phase-change metalenses at near-IR wavelengths with comparable efficiencies in both material states are shown. An

SUBMITTER: Wang M 

PROVIDER: S-EPMC9951390 | biostudies-literature | 2023 Feb

REPOSITORIES: biostudies-literature