Lead Halide Perovskite based Dynamic Metasurfaces

TL;DR

This paper demonstrates MAPbX3 perovskite metasurfaces capable of full 2π phase control with high efficiency, enabling dynamic tuning of optical functions like holography and anomalous reflection through reversible bandgap adjustment.

Contribution

It introduces a novel perovskite metasurface design with complete phase control and dynamic tunability via post-synthetic anion exchange, expanding functionalities of dielectric meta-devices.

Findings

Achieved full 0 to 2π phase control in reflection mode.

Demonstrated high reflection efficiency and polarization conversion.

Enabled reversible tuning of optical properties through bandgap adjustment.

Abstract

Lead halide perovskites (MAPbX3) are known to have high refractive index and controllable bandgap, making them attractive for all-dielectric and tunable metasurfaces. Till now, perovskite metasurfaces have only been used in structural colors. More interesting meta-devices with 2{\pi} phase control are still absent. Here we experimentally demonstrate the MAPbX3 perovskite based metasurfaces with a complete control of phase shift in a reflection mode. By utilizing MAPbBr3 cut-wires as meta-atoms on a ground metal film, we find that the MAPbBr3 perovskite metasurface can produce full phase control from 0 to 2{\pi} and high reflection efficiency simultaneously. Consequently, high-efficiency polarization conversion, anomalous reflection and meta-hologram have been successfully produced. Most interestingly, the bandgap of MAPbX3 perovskite can be post-synthetically and reversibly tuned via anion exchange, providing a new approach to dynamically control of the all-dielectric meta-devices with novel function such as anomalous reflection and hologram et al.