Spatial dissipative solitons in graphene-based active random metamaterials
Abstract
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.
Cite
@article{arxiv.2201.04504,
title = {Spatial dissipative solitons in graphene-based active random metamaterials},
author = {Ashis Paul and Andrea Marini and Samudra Roy},
journal= {arXiv preprint arXiv:2201.04504},
year = {2022}
}