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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Split resonance modes of a AuBRC plasmonic nanosystem caused by the coupling effect
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Split resonance modes of a AuBRC plasmonic nanosystem caused by the coupling effect

机译：耦合效应引起的Aubrc等离子体纳米系统的分离谐振模式

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摘要

A plasmonic nanosystem can give rise to particular optical responses due to a coupling effect. In this work, we investigate the optical properties and field distributions of a novel 'matrioska' nanocavity structure composed of a Au nanorod (AuNR) within a nanobox (AuNB) via finite-difference time-domain (FDTD) simulation. This nanocavity can be fabricated by a two-step wet-chemical method. The multiple SPR modes of optical spectrum for nanocavity are caused by the strong interaction between the AuNR-core and AuNB-shell when the incident light is perpendicular or parallel to the long axis of the Au box/rod nanocavity (AuBRC). The SPR modes are known as the dipole-dipole bonding resonance mode in the lower-energy region and the antibonding resonance mode in the higher-energy region. It is proposed that AuBRC can escape the orientation confinement of AuNR because the multiple modes occur and provide a potential application for the enhancement of the photoluminescence signal. Additionally, the SPR modes red-shift with increasing the offset of the AuNR-core, whereas the SPR mode dramatically blue-shifts when the conductive coupling is formed. The intense 'hot-spot' could be induced within a small interaction region in the conductive coupled system. The SPR line-shape of high quality would also be promoted. The SPR is highly sensitive to the medium, which is promising in the sensing and detecting devices.
机译：由于耦合效应，等离子体纳米系统可以产生特定的光学响应。在这项工作中，我们通过有限差差时域（FDTD）模拟，研究了由纳米框（AUNB）内的Au nanorod（aunr）组成的新型'matrioska'纳米峰结构的光学性质和场分布。该纳米凹陷可通过两步湿化学方法制造。当入射光垂直或平行于Au箱/杆纳米岩（Aubrc）的长轴时，纳米凹陷的光谱的多个光谱的多个SPR模式是由AUNR芯和AUNB-壳之间的强相互作用引起的。 SPR模式称为偶极子 - 偶极键合谐振模式和在更高能量区域中的抗抗凝件谐振模式。提出，AUBRC可以逃避AUNR的取向限制，因为多种模式发生并提供了用于增强光致发光信号的潜在应用。另外，SPR模式随着AUNR芯的偏移而导致的，而SPR模式在形成导电耦合时显着的蓝色移位。强烈的“热点”可以在导电耦合系统中的小相互作用区域内感应。还会促进高品质的SPR线形状。 SPR对介质非常敏感，在传感和检测装置中具有很有希望的介质。

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