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本文提出了一种新颖的基于半导体纳米线/空气间隙/金属薄膜复合结构的表面等离子体纳米激光器,并给出了理论研究和仿真分析.这种结构通过金属界面的表面等离子体模式与高增益介质纳米线波导模式耦合,从而使场增强效应得到显著提高.同时通过数值仿真研究,得到该混合波导结构的模式特性和增益阈值随空气槽宽度、纳米线半径的变化规律,表明它可以实现对输出光场的深亚波长约束,同时保持低损耗传输和高场强限制能力.通过最优化选择,最终得到纳米等离子体激光器的最优结构尺寸.
In this paper, a novel surface plasmon nanodeactor based on semiconductor nanowire / air gap / metal thin film composite structure is proposed, and theoretical research and simulation analysis are given.This structure is achieved by the surface plasmon mode of metal interface and high gain And the coupling effect of dielectric nanowire waveguide mode, so that the field enhancement effect is significantly improved.At the same time, the numerical simulation results show that the mode characteristics and gain threshold of the hybrid waveguide structure change with the width of the air channel and the nanowire radius, Output the deep subwavelength constraint of the optical field while maintaining the ability of low loss transmission and high field strength restriction.Finally, the optimal structure size of the nano-plasmonic laser is obtained through the optimization and selection.