论文标题
基于石墨烯的活性随机超材料中的空间耗散孤子
Spatial dissipative solitons in graphene-based active random metamaterials
论文作者
论文摘要
我们研究了基于石墨烯的活性超材料中的耗散性非线性动力学，该动力由嵌入外部泵送增益培养基中的随机分散石墨烯纳米叶片组成。我们观察到，石墨烯可饱和的非线性产生非线性模式的亚临界分叉，从而使发射辐射的自组织成具有不同拓扑电荷的几种耗散孤子结构。我们系统地研究了这种非线性波及其时空动力学的存在域，发现孤子涡流是不稳定的，从而使自我组织能够自组织具有消失的拓扑电荷，独立于石墨烯纳米 - 薄层的形状。我们的结果阐明了无序系统中相干辐射结构的自组织，并且与未来的无腔激光器和放大器设计有关。
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.
