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Extraordinary single cycle terahertz transmission through ensembles of sub-wavelength size metal particles

机译:通过亚波长尺寸的金属粒子团的非凡单周期太赫兹传输

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摘要

We investigate on-axis terahertz transmission through random collections of sub-wavelength sized metallic particles. Despite both the inherent opacity of the metallic particles at terahertz frequencies and the absence of straight-line photon trajectories through the samples, we observe significant, polarized terahertz transmission through dense metallic particle collections, which are five orders of magnitude thicker than the radiation skin depth. The effects of sample length, particle size, particle shape, and conductivity on the enhanced transmission are explored experimentally and numerically. Our findings show that the polarized terahertz transmission is mediated by coherent near-field coupling of surface electromagnetic waves across the ensemble.
机译:我们通过随机收集亚波长大小的金属颗粒来研究太赫兹传输。尽管金属颗粒在太赫兹频率下固有的不透明性,并且在样品中都没有直线光子轨迹,但我们观察到通过密集的金属颗粒集合的显着极化太赫兹传输,其厚度比辐射趋肤深度厚五个数量级。 。实验和数值研究了样品长度,粒度,颗粒形状和电导率对增强透射率的影响。我们的研究结果表明,极化太赫兹传输是由整个电磁束表面电磁波的相干近场耦合介导的。

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