In this work, we performed an extensive theoretical and experimental study to unveil the underlying mechanisms related to the intensified transmittance in epsilon-near-zero (ENZ)-integrated plasmonic nano-apertures. The occurrence of phase singularities at the incident side of plasmonic nano-apertures results in the reduction in transmittance. We show that transmittance enhancement in ENZ-integrated nano-slits is attributed to the annihilation of the phase singularities by the ENZ layer and subsequently the modification in plasmonic fields of metallic apertures. The singularity annihilation via ENZ metamaterials eliminates the abrupt changes in the phase of the Poynting vector underneath the slit, which results in a stronger cavity resonance inside the aperture. Due to this fact, a nano-aperture on top of an ENZ metamaterial is the only effective configuration to enhance the transmittance in ENZ-integrated nano-apertures. Hence, our study reveals the physics of the transmittance enhancement through ENZ-integrated plasmonic nano-apertures.

中文翻译：

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通过ε-近零超材料在等离激元纳米孔中的相奇异an灭

在这项工作中，我们进行了广泛的理论和实验研究，以揭示与ε近零（ENZ）集成的等离激元纳米孔径中透射率增强相关的潜在机制。在等离子体纳米孔的入射侧出现相异点导致透射率降低。我们表明，ENZ集成纳米缝隙中的透射率提高归因于ENZ层的相奇异性的and灭，以及随后在金属孔径的等离激元场中的修改。通过ENZ超材料进行的奇异ni灭消除了狭缝下方Poynting矢量相位的突变，从而在孔径内部产生了更强的空腔共振。由于这个事实，ENZ超材料顶部的纳米孔径是增强ENZ集成纳米孔径透射率的唯一有效配置。因此，我们的研究揭示了通过ENZ集成的等离子纳米孔增强透射率的物理原理。