College of Science, Tianjin University of Technology, Tianjin 300384, China.
Opt Lett. 2012 Dec 1;37(23):4898-900. doi: 10.1364/OL.37.004898.
A semianalytical Fabry-Perot model is presented to investigate the electromagnetic enhancement by double grooves in gold substrate. The influence of hybrid wave (HW) propagating along the metal surface on field enhancement is explored systematically with a HW model. Simulation results imply that the hybrid generated by one groove can affect the mode fields in the other groove after propagating along the metallic surface. Giant electromagnetic field intensity at resonance condition is found for the groove distance of 0.6λ with the contribution of surface waves, which is nearly independent of the incidence wavelength and groove width.
提出了一种半解析法法布里-珀罗模型来研究金基底中双凹槽的电磁增强。利用混合波（HW）模型系统地研究了沿金属表面传播的 HW 对场增强的影响。模拟结果表明，一个凹槽产生的混合波在沿金属表面传播后会影响另一个凹槽中的模式场。在表面波的贡献下，在槽距为 0.6λ 的情况下，在共振条件下可以获得巨大的电磁场强度，其与入射波长和槽宽无关。
