基于混合表面等离子体波导的纳米激光器

Nanolaser Based on Hybrid Plasmonic Wavguide

提出了一种基于混合表面等离子体波导(HPW)的纳米激光器,并对其进行了理论研究和仿真分析。此结构通过金属-介质界面的表面等离子体模式与高增益介质半导体纳米线波导模式耦合,使中间的空气间隙场强得到显著增大,并保持低损耗传输,实现对输出光场的深亚波长约束。通过对几何参数进行优化,得到具有较小阈值和较高品质因数的纳米激光器。与边缘耦合混合表面等离子体纳米激光器比较可知,当二者的几何参数相同时,基于HPW的纳米激光器具有更小的阈值。

In this paper, a nanolaser based on hybrid plasmonic waveguide is proposed, and its theoretical research and simulation analysis are carried out. In this structure, the plasma mode of metal-dielectric interface is coupled with high gain medium semiconductor nanowire waveguide mode, which greatly increases the intermediate air gap field strength and meanwhile maintains low loss transmission. And deep subwavelength constraint to output light field is realized. By optimizing the geometric parameters of the structure, a nanolaser with smaller threshold and higher quality factors is achieved. Compared with the nanolaser of edge coupled hybrid plasmonic waveguide, the proposed nanolaser with lower threshold can be obtained when the geometric parameters of the two lasers are the same.