Undirectional launcher of surface plasmon polaritons based on subwavelength slits with side-illumination and backside-illumination

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• 作者：Xiuye Liang ; Jicheng Wang ; ^{jcwang@jiangnan.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Baojie Tang ; Xiushan Xia ; Ci Song ; Shinian Qu ; Zhe-Da Hu ; Cheng Liu
• 关键词：Surface plasmon polaritons ; MIM ; Undirectional launcher ; FEM
• 刊名：Optik - International Journal for Light and Electron Optics
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：127
• 期：3
• 页码：1139-1143
• 全文大小：1049 K

文摘

We propose a metal-insulator-metal (MIM) model of undirectional launcher of surface plasmon polaritons (SPPs) based on subwavelength slits with side-illumination and backside-illumination in theory. The electromagnetic field intensities along one direction can be enhanced or suppressed by surface plasmon interference. The periodical change of the splitting ratio is analyzed. The high-efficiency undirectional propagation of SPPs is achieved by utilizing the adjusted double two slits structure with side-illumination. The best splitting ratio is about 30. The finite element method (FEM) illustrates our theoretical design.