纳米等离子体激元二聚体中的辐射频移
Radiative frequency shifts in nanoplasmonic dimers
摘要：
我们研究了电磁环境对相互作用的金属纳米颗粒二聚体中等离子体激元激发共振频率的影响。等离子体激元和真空电磁波动之间的耦合引起共振频率的偏移（类似于原子物理学中的兰姆偏移），这通常在孤立的纳米颗粒中不可测量。与此相反，我们表明，这种转变导致相当大的修正纳米粒子二聚体中的偶极相互作用引起的水平分裂。对于我们在这项工作中考虑的系统参数，纵向和横向杂化模式的水平分裂之间的比率采取一个普遍的形式，只依赖于粒子间的距离，因此是高度不敏感的两个纳米粒子的精确制造细节。我们讨论的可能性，成功地执行建议的测量使用国家的最先进的纳米等离子体结构。
英文摘要：
We study the effect of the electromagnetic environment on the resonance frequency of plasmonic excitations in dimers of interacting metallic nanoparticles. The coupling between plasmons and vacuum electromagnetic fluctuations induces a shift in the resonance frequencies (analogous to the Lamb shift in atomic physics) which is usually not measurable in an isolated nanoparticle. In contrast, we show that this shift leads to sizable corrections to the level splitting induced by dipolar interactions in nanoparticle dimers. For the system parameters which we consider in this work, the ratio between the level splitting for the longitudinal and transverse hybridized modes takes a universal form dependent only on the interparticle distance and thus is highly insensitive to the precise fabrication details of the two nanoparticles. We discuss the possibility to successfully perform the proposed measurement using state-of-the-art nanoplasmonic architectures.
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