半连续银纳米壳在逾渗阈值附近的相干光散射
Coherent Light Scattering from Semicontinuous Silver Nanoshells Near the Percolation Threshold
摘要：
我们报道了在硅胶球上生长的连续银纳米壳的可见消光光谱的测量。我们发现，薄，分形壳低于逾渗阈值表现出几何可调等离子体共振。一种改进的标度理论方法被用来模拟这样的壳的介电响应，然后利用它来获得的消光截面中的延迟米氏散射形式主义。我们表明，这种球形谐振器支持独特的等离子体动力学：在可见光有一个新的制度的相干驱动集群本地化等离子体，而在红外线交叉均匀响应预测离域壳等离子体。
英文摘要：
We report on measurements of visible extinction spectra of semicontinuous silver nanoshells grown on colloidal silica spheres. We find that thin, fractal shells below the percolation threshold exhibit geometrically tunable plasmon resonances. A modified scaling theory approach is used to model the dielectric response of such shells, which is then utilized to obtain the extinction cross section in a retarded Mie scattering formalism. We show that such spherical resonators support unique plasmon dynamics: in the visible there is a new regime of coherently driven cluster-localized plasmons, while crossover to homogeneous response in the infrared predicts a delocalized shell plasmon.
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