Tunable parity-time symmetry vortex laser from a phase change material-based microcavity.

ABSTRACT: Traditional light sources cannot emit an electromagnetic (EM) field with an orbital angular momentum (OAM), limiting their applications in modern optics. The recent development of the OAM laser, mainly based on micro- and nanostructures, can satisfy the increasing requirements for on-chip photonics and information capacities. Nevertheless, the photonic structures have fixed parameters that prevent these OAM lasers from being dynamically tuned. Here, we propose tunable vortex lasing from a microring cavity integrated by a phase change material, Ge₂Sb₂Te₅ (GST225). By modulating the complex refractive index to create an exceptional point (EP) to break the degeneracy of whispering gallery modes with opposite orientations, the microlaser working at the EP can i

SUBMITTER: Su Y 

PROVIDER: S-EPMC10638240 | biostudies-literature | 2023

REPOSITORIES: biostudies-literature