Theoretical Analysis of Optical Absorption Spectra of Parallel Nanowire Dimers and Dolmen Trimers

Theoretical Analysis of Optical Absorption Spectra of Parallel Nanowire Dimers and Dolmen Trimers
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平行纳米线二聚体和支石三聚体光学吸收光谱的理论分析

DOI:
10.1021/acs.jpcc.0c04419
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发表时间:
2020
期刊:
The Journal of Physical Chemistry C
影响因子:
--
通讯作者:
Aikens, Christine M.
Aikens, Christine M.
中科院分区:
--
文献类型:
--
作者:
Pandeya, Pratima;Aikens, Christine M.

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等离子体纳米粒子具有电磁场增强和表面光谱增强的特性。我们使用等离子体杂交方法和群论研究平行二聚体和dolmen三聚体的银(n= 4,6,和10)纳米粒子。等离子体激元模式之间的相互作用进行了研究,减少粒子间的分离距离。使用BP 86/DZ理论水平对结构进行含时密度泛函计算。在二聚体中,颗粒间分离的减小使纵向峰蓝移,但横向峰位置不受显著影响。在三聚体中,还观察到作为纵向峰的肩部的新峰。当二聚体和三聚体的颗粒间距减小到0.6nm时,在纵向和横向峰之间出现一个新的峰。这个新的峰红移,并在进一步减少粒子间的分离强度增加。的跃迁密度和对称性的分析表明,新的峰来自电荷转移激发。
Plasmonic nanoparticles are well-known for their properties of electromagnetic field enhancement and surface spectroscopy enhancement. We used the plasmon hybridization method and group theory to study parallel dimers and dolmen trimers of Agn(n= 4, 6, and 10) nanoparticles. Interactions between the plasmon modes were studied with decreasing interparticle separation distances. Time-dependent density functional calculations are performed on the structures using the BP86/DZ level of theory. In dimers, the decrease of the interparticle separation blue-shifts the longitudinal peak, but the transverse peak position is not affected significantly. In trimers, a new peak is also observed as a shoulder of the longitudinal peak. When the interparticle separation reduces to 0.6 nm in dimers and trimers, a new peak emerges between the longitudinal and transverse peaks. This new peak red-shifts and increases in intensity upon further decreasing the interparticle separation. Analysis of the transition densities and symmetries for the respective peaks shows that the new peak arises from a charge transfer excitation.
银纳米棒二聚体光学吸收光谱的量子力学检验
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