Phase‐Change Perovskite Microlaser with Tunable Polarization Vortex

作者：Jingyi Tian, Giorgio Adamo, Hailong Liu, Mengfei Wu, Maciej Klein, Jie Deng, Norman Soo Seng Ang, Ramón Paniagua‐Domínguez, Hong Liu, Arseniy I. Kuznetsov, Cesare Soci · 发表于：Advanced Materials · 年份：2022 · DOI：10.1002/adma.202207430 · 被引用次数：77 · 研究领域：Metamaterials and Metasurfaces Applications、Photonic and Optical Devices、Orbital Angular Momentum in Optics

Metasurfaces supporting optical bound states in the continuum (BICs) are emerging as simple and compact optical cavities to realize polarization-vortex lasers. The winding of the polarization around the singularity defines topological charges which are generally set by the cavity design and cannot be altered without changing geometrical parameters. Here, a subwavelength-thin phase-change halide perovskite BIC metasurface functioning as a tunable polarization vortex microlaser is demonstrated. Upon the perovskite structural phase transitions, both its refractive index and gain vary substantially, inducing reversible and bistable switching between distinct polarization vortexes underpinned by opposite topological charges. Dynamic tuning and switching of the resulting vector beams may find use in microscopy imaging, particle trapping and manipulation, and optical data storage.