Surface‐Plasmon‐Polariton Diode by Asymmetric Plano‐Concave Nanocavities,Advanced Optical Materials

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Surface‐Plasmon‐Polariton Diode by Asymmetric Plano‐Concave Nanocavities
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2018-02-20 , DOI: 10.1002/adom.201701226
Feifei Liu ₁ , Xinping Zhang ₁

Affiliation

High‐efficiency and direction‐controllable launching of surface plasmon polaritons (SPPs) is highly desired in plasmonic devices and photonic circuits. Here, a heteroplasmonic device is reported consisting of an array of asymmetric nanocavities with each nanocavity constructed by an asymmetric Ag nanoshell (AgNS) and a planar gold film (AuFilm). A photoresist grating is used both as a template for fabricating the AgNS array and as the dielectric filling medium of the nanocavities. Interaction between localized surface plasmon resonance in the asymmetric AgNSs and SPPs in the AuFilm has enhanced the propagating surface modes along the gold film. A phase modulation induced by the asymmetry and interference between the SPP modes have been the main physics supporting the directional propagation of the surface waves or the in‐plane optical diode effect at normal incidence. The SPP diode works in different directions at different wavelengths, which can be controlled by adjusting the asymmetry of the AgNSs.

中文翻译：

非对称平凹纳米腔的表面等离子体激元二极管

表面等离子体激元极化子（SPP）的高效和方向可控的发射在等离子体激元器件和光子电路中是非常需要的。在这里，报道了一种异质子器件，该器件由不对称的纳米腔阵列组成，每个纳米腔由不对称的Ag纳米壳（AgNS）和平面金膜（AuFilm）构成。光致抗蚀剂光栅既用作制造AgNS阵列的模板，又用作纳米腔的电介质填充介质。AuFilm中不对称AgNSs中的局部表面等离振子共振与SPP之间的相互作用增强了沿金膜的传播表面模式。SPP模式之间的不对称和干扰引起的相位调制一直是支持表面波定向传播或法向入射时面内光电二极管效应的主要物理原理。SPP二极管以不同的波长在不同的方向上工作，可以通过调整AgNS的不对称性来控制它。

更新日期：2018-02-20

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