Related Experiment Video
Updated: Oct 25, 2026
Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
Published on: January 28, 2019
Vortex Beam Lasing with Controllable Orbital Angular Momentum and Directivity from Laser-Fabricated Gear-Shaped
Alexey Zhizhchenko1, Artem Cherepakhin1, Eugeny Mitsai1
1Institute of Automation and Control Processes, Far Eastern Branch, Russian Academy of Science , 5 Radio Str., Vladivostok690041, Russia.
Abstract:
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 laser patterning. A rotating multi-beam printing procedure, assisted by a spatial light modulator, achieves sub-10 nm precision in defining the azimuthal grating geometry. The resulting gear-shaped microdisks exhibit low-threshold (50-70 μJ/cm2) vertical lasing, emitting vortex beam superpositions with geometry-controlled directionality and predefined yet opposite topological charge ±l at precisely specified wavelengths. Modeling and back-focal-plane imaging confirm the designed emission characteristics. Leveraging this unique high-precision printing strategy, we introduce a symmetry-breaking cavity with non-uniform azimuthal grating, enabling angular splitting of OAM beams carrying opposite l. This work establishes laser nanopatterning as flexible, direct route to structured-light perovskite microlasers and lays the groundwork for on-chip OAM sources with reconfigurable helicity.
