Performance analysis of nitride alternative plasmonic materials for localized surface plasmon applications
Performance analysis of nitride alternative plasmonic materials for localized surface plasmon applications
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DOI：
10.1007/s00340-012-4955-3
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发表时间：
2012-05-01
影响因子：
2.1
通讯作者：
Kildishev, A. V.
中科院分区：
文献类型：
--
作者：
Guler, U.;Naik, G. V.;Kildishev, A. V.
我们考虑的方法来定义不同的等离子体材料的性能指标，用于局部表面等离子体应用。光学效率被证明是更好的性能指标相比，在准静态制度的近似。近场强度效率是散射效率的一种推广形式，是局域场增强应用中一种更为灵活和有用的度量。我们还研究了具有不同半径的球形纳米颗粒从颗粒表面到远场区域的场增强的演变。氮化钛和氮化锆，这是最近提出的替代等离子体材料在可见光和近红外范围内，比较金的性能。与准静态方法的结果相反，这两种氮化物材料都是通常等离子体材料的非常好的替代品。
We consider methods to define the performance metrics for different plasmonic materials to be used in localized surface plasmon applications. Optical efficiencies are shown to be better indicators of performance as compared to approximations in the quasistatic regime. The near-field intensity efficiency, which is a generalized form of the well-known scattering efficiency, is a more flexible and useful metric for local-field enhancement applications. We also examine the evolution of the field enhancement from a particle surface to the far-field regime for spherical nanoparticles with varying radii. Titanium nitride and zirconium nitride, which were recently suggested as alternative plasmonic materials in the visible and near-infrared ranges, are compared to the performance of gold. In contrast to the results from quasistatic methods, both nitride materials are very good alternatives to the usual plasmonic materials.