利用亚趋附深度Ag膜在双层金属孔径阵列中实现一个显着的透射增强

本文采用理论和实验研究了利用亚趋附深度Ag膜在(Ag@Au)双层金属孔径阵列中实现的一个显着的透射增强现象，这是由于通过倏逝波使银/金界面中的表面等离激元（SPP）耦合作用的结果。结果表明，增强透射率是高度依赖Ag膜的厚度。当Ag膜厚度的增加，透射率峰值先增大，然后减小。此外，其他金属材料的性能也进行了讨论。当Ag膜的厚度为4 nm时，得到一个最高的透射率峰值。时域有限差分法（FDTD）模拟与实验结果吻合良好。这一发现提供了一种有效的方式来控制双层金属孔阵列的增强透射特性，在设计一个高性能的等离子体热发射器方面具有潜在的应用价值。

Significantly enhanced transmission achieved with double-layered metallic aperture arrays with sub-skin-depth Ag film

We present both theoretical and experimental investigation on significantly enhanced transmission through (Ag/Au) double-layered metallic aperture arrays with sub-skin-depth Ag film due to the coupling role of a surface plasmon polariton at the Ag/Au interface by evanescent waves. The results indicate that the enhanced transmittance is highly dependent on the Ag film thickness. When the Ag film thickness increases, the peak transmittance firstly increases and then decreases. Moreover, other metal material properties are also discussed. The highest peak transmittance is obtained when the Ag film thickness is 4 nm. The finite-difference time-domain simulations agree well with the experimental results. This finding provides an effective way to control the enhanced transmission for double-layered metallic aperture arrays, which has potential applications in designing a high-performance plasmonic thermal emitter.