Optical Spectroscopy of Conductive Junctions in Plasmonic Cavities
Optical Spectroscopy of Conductive Junctions in Plasmonic Cavities
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DOI：
10.1021/nl1017173
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发表时间：
2010-08-01
期刊：
影响因子：
10.8
通讯作者：
Aizpurua, J.
中科院分区：
文献类型：
--
作者：
Perez-Gonzalez, O.;Zabala, N.;Aizpurua, J.
由导电结桥接的纳米颗粒二聚体的光学性质强烈地依赖于结的导电性。随着电导率的增加，成键二聚体等离子激元蓝移和展宽。对于较大的电导，光谱中还出现了低能电荷转移等离子体激元，其线宽随电导的增大而减小。提出了一个用于理解光谱特征的简单物理模型。我们发现结电导对光谱有很强的影响，这表明等离子体腔可能作为分子电导的探针，在通过电学测量无法到达的更高频率上。
The optical properties of a nanoparticle dimer bridged by a conductive junction depend strongly on the junction conductivity. As the conductivity increases, the bonding dimer plasmon blueshifts and broadens. For large conductance, a low energy charge transfer plasmon also appears in the spectra with a line width that decreases with increasing conductance. A simple physical model for the understanding of the spectral feature is presented. Our finding of a strong influence of junction conductivity on the optical spectrum suggests that plasmonic cavities might serve as probes of molecular conductance at elevated frequencies not accessible through electrical measurements.