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Related Experiment Video

Updated: Aug 23, 2025

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Phase-Change Perovskite Microlaser with Tunable Polarization Vortex.

Jingyi Tian1,2, Giorgio Adamo1,2, Hailong Liu3

  • 1Centre for Disruptive Photonic Technologies, TPI, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore.

Advanced Materials (Deerfield Beach, Fla.)
|November 2, 2022
PubMed
Summary

This study demonstrates a novel perovskite metasurface that acts as a tunable polarization vortex microlaser. It achieves reversible switching of topological charges by leveraging phase-change properties, enabling dynamic control of vector beams.

Keywords:
all-dielectric metasurfacesoptical bistabilityphase-change perovskitespolarization vorticestunable microlaserstunable topological charges

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Nanotechnology

Background:

  • Metasurfaces with optical bound states in the continuum (BICs) are promising for compact polarization-vortex lasers.
  • Topological charges of polarization vortices are typically fixed by metasurface geometry.
  • Controlling these topological charges dynamically is a significant challenge.

Purpose of the Study:

  • To demonstrate a tunable polarization vortex microlaser using a phase-change halide perovskite BIC metasurface.
  • To achieve reversible and bistable switching of polarization vortex topological charges.
  • To explore applications in dynamic beam manipulation.

Main Methods:

  • Fabrication of a subwavelength-thin halide perovskite metasurface supporting BICs.
  • Inducing structural phase transitions in the perovskite material.
  • Characterizing changes in refractive index and gain during phase transitions.
  • Observing and controlling polarization vortex switching.

Main Results:

  • The perovskite BIC metasurface exhibited tunable laser emission.
  • Structural phase transitions led to substantial variations in refractive index and gain.
  • Reversible and bistable switching between polarization vortices with opposite topological charges was achieved.
  • Dynamic tuning and switching of vector beams were demonstrated.

Conclusions:

  • Phase-change halide perovskite metasurfaces offer a novel platform for tunable polarization vortex microlasers.
  • The demonstrated dynamic control of topological charges is a significant advancement.
  • Potential applications include advanced microscopy, particle manipulation, and optical data storage.