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Plasmonic control of extraordinary optical transmission in the infrared regime

机译：红外制度中非光学传输等离子体控制

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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：我们表明，矩形孔的金属阵列中的非凡光学传输（EOT）谐振的光谱位置可以在近红外线范围内相位转调谐。实验已经在图案化的金膜上进行。我们专注于靠近孔的截止波长的局部共振的子集，Lambda（C）。金属通常被认为是红外方案中的完美电导体，在λ（c）= 2 l周围发现矩形孔的EOT切断共振（L是长边）。对于真正的金属，电磁场的渗透是简单地被视为有效的扩大L.然而，通过改变孔短边，我们发现λ（c）由于间隙表面等离子体极性恒星的激发而变化。有限元计算证实，在这些高纵横比中，短边的矩形必须考虑两个重要方面，以便解释实验：金属的有限电导率和纳米孔内的间隙表面等离子体的激发。

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