Concentrating light at the deep subwavelength scale by utilizing plasmonic effects has been reported in various optoelectronic devices with intriguing phenomena and functionality. Plasmonic waveguides with a planar structure exhibit a two-dimensional degree of freedom for the surface plasmon; the degree of freedom can be further reduced by utilizing metallic nanostructures or nanoparticles for surface plasmon resonance. Reduction leads to different lightwave confinement capabilities, which can be utilized to construct plasmonic nanolaser cavities. However, most theoretical and experimental research efforts have focused on planar surface plasmon polariton (SPP) nanolasers. In this study, we combined nanometallic structures intersecting with ZnO nanowires and realized the first laser emission based on pseudowedge SPP waveguides. Relative to current plasmonic nanolasers, the pseudowedge plasmonic lasers reported in our study exhibit extremely small mode volumes, high group indices, high spontaneous emission factors, and high Purell factors beneficial for the strong interaction between light and matter. Furthermore, we demonstrated that compact plasmonic laser arrays can be constructed, which could benefit integrated plasmonic circuits.

中文翻译：

---

超紧凑伪等离子激光器和激光阵列

已经报道了在各种具有有趣现象和功能的光电装置中利用等离子体激元效应将光聚集在深亚波长范围内的情况。具有平面结构的等离激元波导表现出表面等离激元的二维自由度；通过利用金属纳米结构或纳米粒子进行表面等离子体共振，可以进一步降低自由度。还原导致不同的光波限制能力，可用于构建等离激元纳米激光腔。但是，大多数理论和实验研究工作都集中在平面等离子激元（SPP）纳米激光上。在这项研究中，我们结合了与ZnO纳米线相交的纳米金属结构，并实现了基于伪楔形SPP波导的首次激光发射。相对于当前的等离激元纳米激光，在我们的研究中报道的伪楔形等离激元激光器显示出极小的模式体积，高的组指数，高的自发发射因子和高的Purell因子，有利于光与物质之间的强相互作用。此外，我们证明了可以构造紧凑的等离激元激光器阵列，这可能有益于集成的等离激元电路。