This work theoretically proposes a novel surface plasmon polaritons nanolaser enhanced by 2D black phosphorus (BP) nanosheets, which can greatly enhance the local electric field and reduce the normalized mode area. The plasmonic nanolaser is created by integrating few-layered BP nanosheets into a hybrid waveguide structure consisting of a cadmium sulfide (CdS) semiconductor nanowire, a low-index dielectric MgF₂ buffer film, and a silver substrate. Both the electric field distribution and mode parameters originating from the proposed hybrid structure are systematically studied. The simulation results show that, under the optimal conditions with r = 95 nm, h_gap = 2 nm, and d = 1 nm, three key mode parameters (effective mode area, gain threshold, and propagation distance) can be determined to be 0.008 λ², 0.5997 µm⁻¹, and 3309 nm, respectively. Moreover, the figure of merit of the proposed nanolaser is enhanced by almost 2.3 times compared with the model without BP nanosheets. It can be expected that the proposed plasmonic nanolaser shows great potential in exploring ultrahigh density photonic integrated circuit.

中文翻译：

---

黑磷纳米片增强的低阈值和长距离传播等离子体纳米激光器

这项工作从理论上提出了一种由二维黑磷（BP）纳米片增强的新型表面等离子体极化激元纳米激光器，可以大大增强局部电场并减少归一化模式面积。等离子体纳米激光器是通过将几层 BP 纳米片集成到由硫化镉 (CdS) 半导体纳米线、低指数介电 MgF ₂缓冲膜和银衬底组成的混合波导结构中创建的。系统地研究了源自所提出的混合结构的电场分布和模式参数。仿真结果表明，在r = 95 nm、h _gap = 2 nm、d= 1 nm，可以确定三个关键模式参数（有效模式面积、增益阈值和传播距离）分别为 0.008 λ ²、0.5997 µm ^-1和 3309 nm。此外，与没有 BP 纳米片的模型相比，所提出的纳米激光器的品质因数提高了近 2.3 倍。可以预期，所提出的等离子体纳米激光器在探索超高密度光子集成电路方面显示出巨大的潜力。