Vortex Beam Lasing with Controllable Orbital Angular Momentum and Directivity from Laser-Fabricated Gear-Shaped Perovskite Microdisks.
Orbital angular momentum (OAM) of light provides a fundamental degree of freedom for advanced photonics, yet compact, chip-scale vortex sources remain elusive. Here, we demonstrate OAM emission from optically pumped halide perovskite MAPbBr3 microdisks featuring gear-shaped sidewall modulations realized via femtosecond...