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设计了一种带圆角的金属脊和低折射率空气间隙的新型混合表面等离子体波导结构。基于有限元法建立数学模型,在工作波长为489nm的可见光波段研究了该波导的电场分布、归一化模式面积、传输距离、品质因子和珀塞尔因子随金属脊曲率半径的变化情况。结果表明,调整结构参数可使波导实现超深亚波长的光场限制,同时获得较大的SPPs辐射增强倍数。在最优几何参数(纳米线半径为95nm,金属脊曲率半径为20nm)下,波导有效模式面积为0.0037λ2,品质因子为268,珀塞尔因子为65,增益阈值为0.2768μm-1,其表征激光增强值为69800。该激光器谐振腔具有超强的局域能力和激光增强能力,可以实现超深亚波长的低阈值激射。
A new hybrid surface plasmon waveguide structure with rounded metal ridge and low refractive index air gap was designed. Based on the finite element method, the mathematical model was established and the electric field distribution, normalized mode area, transmission distance, quality factor and Purcell factor with curvature radius of metal ridges were studied in the visible wavelength band of 489nm. The results show that adjusting the structural parameters can make the waveguide realize the super-deep subwavelength light field limitation, and at the same time, gain the larger SPPs radiation enhancement multiple. The effective mode area of the waveguide is 0.0037λ2, the quality factor is 268, the Purcell factor is 65 and the gain threshold is 0.2768μm-1 under the optimal geometrical parameters (the radius of nanowires is 95nm and the radius of curvature of metal ridge is 20nm) The laser enhancement value was 69,800. The laser resonator has superior local capability and laser enhancement capability, enabling ultra-deep sub-wavelength low threshold lasing.