Optical properties of coupled metal-semiconductor and metal-molecule nanocrystal complexes: Role of multipole effects
Optical properties of coupled metal-semiconductor and metal-molecule nanocrystal complexes: Role of multipole effects
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DOI：
10.1103/physrevb.77.165301
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发表时间：
2008-04-01
影响因子：
3.7
通讯作者：
Govorov, Alexander O.
中科院分区：
文献类型：
--
作者：
Yan, Jie-Yun;Zhang, Wei;Govorov, Alexander O.
我们从理论上研究了光偶极子（半导体量子点或分子）与金属纳米粒子之间的相互作用效应。计算的混合结构的吸收光谱表明强烈的干扰来自激子-等离子体激元耦合的影响。特别地，吸收光谱获得特征不对称线形和强反共振。我们在这里提出了一个精确的解决方案，超越了偶极子近似的问题，并发现多极处理的相互作用是至关重要的强相互作用激子等离子体纳米系统的理解。有趣的是，激子共振的可见性变得大大增强小粒子间的距离，由于干涉现象，多极效应，和电磁增强。我们发现相消干涉特别强。使用我们的精确理论，我们表明，即使在室温下，在激发系统中的干涉效应可以在实验中观察到。
We theoretically investigate the effects of interaction between an optical dipole (semiconductor quantum dot or molecule) and metal nanoparticles. The calculated absorption spectra of hybrid structures demonstrate strong effects of interference coming from the exciton-plasmon coupling. In particular, the absorption spectra acquire characteristic asymmetric line shapes and strong antiresonances. We present here an exact solution of the problem beyond the dipole approximation and find that the multipole treatment of the interaction is crucial for the understanding of strongly interacting exciton-plasmon nanosystems. Interestingly, the visibility of the exciton resonance becomes greatly enhanced for small interparticle distances due to the interference phenomenon, multipole effects, and electromagnetic enhancement. We find that the destructive interference is particularly strong. Using our exact theory, we show that the interference effects can be experimentally observed in the exciting systems even at room temperature.