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Plasmonic control of extraordinary optical transmission in the infrared regime

机译：等离子在红外条件下控制非凡的光传输

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We demonstrate that the spectral location of extraordinary optical transmission (EOT) resonances in metallic arrays of rectangular holes can be plasmonically tuned in the near and mid-infrared ranges. The experiments have been performed on patterned gold films. We focus on a subset of localized resonances occurring close to the cut-off wavelength of the holes, lambda(c). Metals are usually regarded as perfect electric conductors in the infrared regime, with an EOT cut-off resonance found around lambda(c) = 2 L for rectangular holes (L being the long edge). For real metals, the penetration of the electromagnetic fields is simply seen as effectively enlarging L. However, by changing the hole short edge, we have found that lambda(c) varies due to the excitation of gap surface plasmon polaritons. Finite-element calculations confirm that in these high aspect ratio rectangles with short edges two important aspects have to be taken into account in order to explain the experiments: the finite conductivity of the metal and the excitation of gap-surface plasmons inside the nanoholes.
机译：我们证明，可以在近红外和中红外范围内通过等离子体方式调谐矩形孔的金属阵列中非常规光学传输（EOT）共振的光谱位置。实验是在图案化的金膜上进行的。我们专注于局部共振的一个子集，该子集发生在接近孔的截止波长λ（c）的位置。金属通常被认为是红外领域中的理想电导体，对于矩形孔（L为长边），在lambda（c）= 2 L附近发现了EOT截止共振。对于真实金属，电磁场的渗透被视为有效地放大了L。但是，通过更改孔的短边，我们发现lambda（c）由于间隙表面等离激元极化子的激发而发生变化。有限元计算证实，在这些具有短边的高长宽比矩形中，为了解释实验必须考虑两个重要方面：金属的有限电导率和纳米孔内部间隙表面等离子体激元的激发。

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