Efficient unidirectional SPP launcher: coupling the SPP to a smooth surface for propagation
Efficient unidirectional SPP launcher: coupling the SPP to a smooth surface for propagation
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DOI：
10.1364/ol.447489
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发表时间：
2022-02-01
期刊：
影响因子：
3.6
通讯作者：
Qin, Yuwen
中科院分区：
文献类型：
--
作者：
Liu, Wenjie;Wang, Guoxuan;Qin, Yuwen
提出了一种耦合效率高、传输长度长的单向表面等离子体激元发射器。该结构由石英衬底上由Si02层隔开的金属斜栅和金属膜组成。通过插入SiO2层，金属光栅与金属薄膜之间的强相互作用可以显著提高入射光到表面等离子体激元的转换。同时，由于金属薄膜与衬底之间界面光滑的特点，传播过程中产生的表面等离子体的耗散将显著降低。数值模拟表明，该结构具有11个光栅周期，具有较高的对比度和发射效率。与粗糙的金属-石英界面相比，光滑的金属-石英界面光转换效率可提高22.6%以上，传输距离延长约15810。(C)2022光学出版集团
We propose a unidirectional surface plasmon polariton (SPP) launcher with high coupling efficiency and long propagation length. The structure consists of a metallic slanted grating and a metal film that are separated by a Si0 2 layer on a quartz substrate. By inserting the Si0 2 layer, strong interaction between the metal grating and metal film can significantly increase the conversion of incident light into SPPs. Meanwhile, due to the characteristics of the smooth interface between metal film and substrate, the dissipation of SPP originating from the propagation process will be remarkably reduced. Numerical simulations show that this structure with 11 grating periods will obtain high contrast and efficiency of launching. Compared with the rough metal-quartz interface, the smooth one can improve the efficiency of light conversion to SPPs by more than 22.6% and extend the propagating distance by approximately 15810. (C) 2022 Optica Publishing Group