2022/01/12 by Ashis Kumar Paul, Ashis Paul, Andrea Carlo Marini +5
Physics and Astronomy · #Advanced Fiber Laser Technologies #FOS: Physical sciences #Nonlinear Photonic Systems #Optics (physics.optics) #Orbital Angular Momentum in Optics #physics.optics
paper · pdf · doi:10.48550/arxiv.2201.04504
arxiv created 2022/01/12 · openalex publication_date 2022/01/12 · arxiv updated 2022/01/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We investigate dissipative nonlinear dynamics in graphene-based active metamaterials composed of randomly dispersed graphene nano-flakes embedded within an externally pumped gain medium. We observe that graphene saturable nonlinearity produces a sub-critical bifurcation of nonlinear modes, enabling self-organization of the emitted radiation into several dissipative soliton structures with distinct topological charges. We systematically investigate the existence domains of such nonlinear waves and their spatio-temporal dynamics, finding that soliton vortices are unstable, thus enabling self-organization into single dissipative structures with vanishing topological charge, independently of the shape of the graphene nano-flakes. Our results shed light on self-organization of coherent radiation structures in disordered systems and are relevant for future cavity-free lasers and amplifier designs.