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THz anomalous transmission in plasmonic lattices; incidence angledependence

机译：在等离子体格子中的异常传输;发病率敏感

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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. 0 is fit with a theoretical formula that takes into account the effective dielectric function of the plasmonic lattice vs. 0, 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：通过在金属薄膜（等离子体晶格中的亚壳长度阵列（等离子体晶格）中的异常传输现象被认为是由薄膜表面上的表面等离子体极化子（SPP）介导的。使用太赫兹时域光谱，我们通过等离子体晶格系统地研究了异常透射光谱作为撞击梁的入射角的θ。当θ偏离常规入射时，观察到将各种传输共振分成两个共振分支，这取决于光束的偏振方向和θ的偏振方向。我们表明，传输共振分离与不同SPP分支的色散关系无关，而是与金属表面上的SPP波的干涉特性相关联。分体式谐振频率与0的依赖性适用于理论公式，其考虑了等离子体晶格与0的有效介电功能，这强调了扇形型抗共振在传输光谱中的重要作用。最后，我们介绍了一种简单的方法，用于制作具有高Q因子的高效凹口滤波器，利用旋转下的传输谐振分裂。

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