Study of resonant modes of a periodic metallic array near a dielectric interface: evanescent-to-propagating coupling via surface plasmon excitation
Study of resonant modes of a periodic metallic array near a dielectric interface: evanescent-to-propagating coupling via surface plasmon excitation
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研究电介质界面附近周期性金属阵列的谐振模式：通过表面等离子体激发的瞬逝-传播耦合
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发表时间：
2006
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通讯作者：
Marcelo Lester
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作者：
D. Skigin;Marcelo Lester
研究了介电界面附近金属圆柱体二维周期阵列的结构模式，适用于大和小波长周期比。我们表明存在两种明显不同的共振：阵列和界面之间间隙的波导模式和本征模式激发（等离子体激元）。虽然两种偏振都存在波导模式，但表面等离子体激元 (SPP) 仅在 p 偏振时出现，并且在特定条件下，这种机制可以在入射倏逝波和结构支持的本征模之间产生有效耦合（约 60%），从而产生增强的传输传播阶次。通过改变相关参数来详细分析结构的响应，特别关注 SPP 和瑞利异常之间的相互作用及其对光栅响应的影响。
The structural modes of a 2D periodic array of metallic cylinders near a dielectric interface are studied, for large and small wavelength-to-period ratios. We show that there are two clearly distinguished kinds of resonances: waveguide modes of the gap between the array and the interface, and eigenmode excitations (plasmons). While waveguide modes are present for both polarizations, surface plasmon polaritons (SPPs) only occur for p polarization, and, under particular conditions, this mechanism can produce an efficient coupling (about 60%) between the incident evanescent wave and the eigenmodes supported by the structure, which produces an enhanced transmitted propagating order. The response of the structure is analysed in detail by varying its relevant parameters, paying particular attention to the interplay between SPPs and Rayleigh anomalies, and its effect on the grating response.