棒状纳米天线等离子体共振的类Fano干涉
Fano-like interference of plasmon resonances at a single rod-shaped nanoantenna
摘要：
单金属纳米棒作为半波天线在光学范围内表现出不对称的，多共振散射光谱，强烈依赖于它们的长度和介电性质。在这里，我们表明，这样的光谱特征可以很容易地理解在相邻的等离子体共振之间的Fano干扰。不同的几何形状的分析和数值结果的基础上，我们证明，法诺共振可能会出现这样的单粒子纳米天线的相互作用的共振重叠在空间和频率域。
英文摘要：
Single metallic nanorods acting as half-wave antennas in the optical range exhibit an asymmetric, multi-resonant scattering spectrum that strongly depends on both their length and dielectric properties. Here we show that such spectral features can be easily understood in terms of Fano-like interference between adjacent plasmon resonances. On the basis of analytical and numerical results for different geometries, we demonstrate that Fano resonances may appear for such single-particle nanoantennas provided that interacting resonances overlap in both spatial and frequency domains.
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