Opt Lett. 2014 Feb 15;39(4):973-6. doi: 10.1364/OL.39.000973.
In this Letter, a novel waveguide based on hybrid surface plasmon polaritons (HSPPs) is proposed and numerically analyzed. This waveguide consists of two dielectric nanowires placed on both sides of a nanowedge-patterned metal film, which can confine light in the ultra-deep-subwavelength region (ranging from λ²/4000 to λ²/400) with a long propagation length (ranging from 1200 to 3500 μm). Compared to a previous HSPPs waveguide without the nanowedges, with the same propagation length, our proposed structure has much higher mode confinement with 1 order of magnitude smaller normalized mode area. An investigation of the effect of structural perturbations indicates that our proposed waveguide also has good tolerance of fabrication errors. The proposed waveguide could be an interesting alternative structure to realize nanolasers and optical trapping.
在这封信件中，提出并数值分析了一种基于混合表面等离子体激元（HSPP）的新型波导。该波导由放置在纳米楔形图案金属膜两侧的两个介质纳米线组成，可将光限制在超深亚波长区域（范围从 λ²/4000 到 λ²/400），传播长度长（范围从 1200 到 3500 μm）。与没有纳米楔形的先前 HSPP 波导相比，在相同的传播长度下，我们提出的结构具有更高的模式限制，归一化模式面积小一个数量级。对结构扰动影响的研究表明，我们提出的波导对制造误差也具有良好的容忍度。所提出的波导可能是实现纳米激光器和光捕获的有趣替代结构。
