用于介质加载表面等离子体激元耦合和弯曲波导的高级分析的动量空间光谱学
Momentum-space spectroscopy for advanced analysis of dielectric-loaded surface plasmon polariton coupled and bent waveguides
摘要：
我们进行先进的辐射泄漏显微镜路由介质加载等离子体波导结构。通过直接平面成像和动量空间光谱，我们分析了耦合波导之间的能量传递作为间隙距离的函数，并揭示了弯曲几何形状的动量分布。具体来说，我们观察到一个明确的简并升降机的有效指数强相互作用的波导与耦合模理论。我们使用动量空间表示来讨论曲率对介质加载波导的影响。实验图像被成功地再现的数值和分析模型的模式在弯曲的等离子体波导中传播。
英文摘要：
We perform advanced radiation leakage microscopy of routing dielectric-loaded plasmonic waveguiding structures. By direct plane imaging and momentum-space spectroscopy, we analyze the energy transfer between coupled waveguides as a function of gap distance and reveal the momentum distribution of curved geometries. Specifically, we observed a clear degeneracy lift of the effective indices for strongly interacting waveguides in agreement with coupled-mode theory. We use momentum-space representations to discuss the effect of curvature on dielectric-loaded waveguides. The experimental images are successfully reproduced by a numerical and an analytical model of the mode propagating in a curved plasmonic waveguide.
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