具有非局域材料特性的纳米等离子体激元的模态分析
Modal analysis for nanoplasmonics with nonlocal material properties
摘要：
具有几纳米特征尺寸的等离子体器件表现出可以由非局部流体动力学Drude模型描述的效应。我们演示了如何利用轮廓积分的方法来计算这样的系统的本征频率和共振状态。我们提出了一种方法来推导相关的物理观测量的模态展开。我们使用的方法进行模态分析的金属纳米线。计算了大频率范围内的所有复本征频率和相应的共振态。我们确定这些共振态是相关的消光截面的纳米线。
英文摘要：
Plasmonic devices with feature sizes of a few nanometers exhibit effects which can be described by the nonlocal hydrodynamic Drude model. We demonstrate how to exploit contour integral methods for computing eigenfrequencies and resonant states of such systems. We propose an approach for deriving the modal expansion of relevant physical observables. We use the methods to perform a modal analysis for a metal nanowire. All complex eigenfrequencies in a large frequency range and the corresponding resonant states are computed. We identify those resonant states which are relevant for the extinction cross section of the nanowire.
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