Graded index surface-plasmon-polariton devices for subwavelength light management
Graded index surface-plasmon-polariton devices for subwavelength light management
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DOI：
10.1103/physrevb.82.153411
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发表时间：
2010-10-21
影响因子：
3.7
通讯作者：
Longhi, S.
中科院分区：
文献类型：
--
作者：
Della Valle, G.;Longhi, S.
我们提出并数值演示了一种抛物线梯度折射率(GRIN)波导用于表面等离子体激元(SPP)，它允许约束在金属-介质界面上的SPP波的亚波长自成像和聚焦。将GRIN结构应用于超小型表面等离子体多模干涉器件的设计。特别是通过全波数值模拟验证了一种用于介质加载SPP光波导的4×4交叉连接器件和一种高效的波导发射器。
We propose and numerically demonstrate a parabolic graded index (GRIN) waveguide for surface-plasmon polaritons (SPPs) allowing subwavelength self-imaging and focusing of SPP waves bound at a metal-dielectric interface. The GRIN structure is applied to design ultracompact multimode-interference devices for SPPs. In particular, a 4 x 4 cross-connect device and an efficient waveguide launcher for dielectric-loaded SPP waveguides are demonstrated by full-wave numerical simulations.