Transmission through seemingly opaque surfaces, so-called extraordinary transmission, provides an exciting platform for strong light–matter interaction, spectroscopy, optical trapping, and color filtering. Much of the effort has been devoted to understanding and exploiting TM extraordinary transmission, while TE anomalous extraordinary transmission has been largely omitted in the literature. This is regrettable from a practical point of view since the stronger dependence of the TE anomalous extraordinary transmission on the array’s substrate provides additional design parameters for exploitation. To provide high-performance and cost-effective applications based on TE anomalous extraordinary transmission, a complete physical insight about the underlying mechanisms of the phenomenon must be first laid down. To this end, resorting to a combined methodology including quasi-optical terahertz (THz) time-domain measurements, full-wave simulations, and method of moments analysis, subwavelength slit arrays under s-polarized illumination are studied here, filling the void in the current literature. We believe this work unequivocally reveals the leaky-wave role of the grounded-dielectric slab mode mediating in TE anomalous extraordinary transmission and provides the necessary framework to design practical high-performance THz components and systems.

中文翻译：

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揭示 TE 非凡太赫兹传输背后的潜在机制

通过看似不透明的表面传输，即所谓的非凡传输，为强光-物质相互作用、光谱学、光学捕获和滤色提供了一个令人兴奋的平台。大部分努力都致力于理解和利用 TM 异常传输，而 TE 异常异常传输在文献中基本上被省略了。从实际的角度来看，这是令人遗憾的，因为 TE 异常异常透射对阵列基板的更强依赖性为开发提供了额外的设计参数。为了提供基于 TE 异常异常传输的高性能和经济高效的应用程序，必须首先对这种现象的潜在机制有一个完整的物理洞察力。为此，借助包括准光学太赫兹 (THz) 时域测量、全波模拟和矩分析方法在内的组合方法，这里研究了 s 偏振照明下的亚波长狭缝阵列，填补了当前文献中的空白。我们相信这项工作明确揭示了接地介电板条模式在 TE 异常异常传输中介导的漏波作用，并为设计实用的高性能太赫兹组件和系统提供了必要的框架。