Abstract. For two decades, extraordinary optical transmission has amplified exploration into subwavelength systems. Researchers have previously suggested exploiting the spectrally selective electromagnetic field confinement of subwavelength slits for multispectral detectors. Utilizing the finite-difference frequency-domain method, we examine electromagnetic field confinement in both two-dimensional and three-dimensional scenarios from 2.5 to 6 μm, i.e., midwave infrared. We explore the trade space of deep subwavelength slits and its impact on resonant enhancement of the electromagnetic field. This builds a fundamental understanding of the coupling mechanisms, allowing for prediction of resonant spectral behavior based on slit geometry and material properties.

中文翻译：

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亚波长狭缝几何形状的光谱依赖性

摘要。二十年来，非凡的光传输放大了对亚波长系统的探索。研究人员此前曾建议为多光谱探测器利用亚波长狭缝的光谱选择性电磁场限制。利用有限差分频域方法，我们研究了二维和三维场景中 2.5 到 6 微米（即中波红外）的电磁场限制。我们探索了深亚波长狭缝的交易空间及其对电磁场共振增强的影响。这建立了对耦合机制的基本理解，允许基于狭缝几何形状和材料特性预测共振光谱行为。