Theory of surface plasmon generation at nanoslit apertures
Theory of surface plasmon generation at nanoslit apertures
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DOI：
10.1103/physrevlett.95.263902
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发表时间：
2005-12-31
影响因子：
8.6
通讯作者：
Rodier, JC
中科院分区：
文献类型：
--
作者：
Lalanne, P;Hugonin, JP;Rodier, JC
在这封信中，我们研究了金属屏中单个亚波长狭缝的光散射。与以前的理论工作相比，我们提供了一个微观的散射过程的描述，强调在狭缝孔径的表面等离子体激元的产生。分析是支持一个严格的形式主义的基础上的正常模式分解技术和半解析模型，提供了准确的公式的等离子体激元生成强度。的生成被证明是相当有效的金属与低导电性，如黄金在可见光范围内。通过与最近的实验数据[H. F. Schouten等人，物理修订信函94，053901（2005）]。
In this Letter, we study the scattering of light by a single subwavelength slit in a metal screen. In contrast with previous theoretical works, we provide a microscopic description of the scattering process by emphasizing the generation of surface plasmons at the slit apertures. The analysis is supported by a rigorous formalism based on a normal-mode-decomposition technique and by a semianalytical model that provides accurate formulas for the plasmonic generation strengths. The generation is shown to be fairly efficient for metals with a low conductivity, such as gold in the visible regime. Verification of the theory is also shown by comparison with recent experimental data [H.F. Schouten et al., Phys. Rev. Lett. 94, 053901 (2005)].