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THz anomalous transmission in plasmonic lattices; incidence angle dependence

机译：等离子体晶格中的太赫兹异常传输；入射角依赖性

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摘要

The phenomenon of anomalous transmission through subwavelength aperture arrays in metallic films (plasmonic lattices) is thought to be mediated by surface plasmon polaritons (SPP) on the film surfaces. Using terahertz time-domain spectroscopy we systematically studied the anomalous transmission spectrum through plasmonic lattices as a function of the incidence angle, θ of the impinging beam. We observed splitting of the various transmission resonances into two resonance branches when θ deviates from normal incidence that depends on the polarization direction of the beam respect to the plane of incidence and θ. We show that the transmission resonance splitting is not related to dispersion relation of different SPP branches, but rather is associated to the interference properties of the SPP waves on the metal surface. The dependence of the split resonant frequencies vs. θ is fit with a theoretical formula that takes into account the effective dielectric function of the plasmonic lattice vs. θ, which emphasizes the important role of the Fano-type anti-resonances in the transmission spectrum. Finally, we introduced a simple way for making an efficient notch filter with high Q factor exploiting the splitting of transmission resonance under rotation.
机译：通过金属膜（等离子晶格）中的亚波长孔径阵列的异常传输现象被认为是由膜表面的表面等离激元极化子（SPP）介导的。使用太赫兹时域光谱，我们系统地研究了通过等离激元晶格的反常透射光谱与入射光束入射角θ的关系。我们观察到，当θ偏离法线入射角时，各种传输共振会分成两个共振分支，而法线入射取决于光束相对于入射平面和θ的偏振方向。我们表明，传输共振分裂与不同SPP分支的色散关系无关，而与SPP波在金属表面上的干涉特性有关。分开的谐振频率与θ的依赖关系符合理论公式，该公式考虑了等离激元晶格与θ的有效介电函数，从而强调了Fano型反谐振在透射光谱中的重要作用。最后，我们介绍了一种利用旋转条件下传输共振的分裂来制作具有高Q因子的有效陷波滤波器的简单方法。

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