Nonlocal effect on the refractive index sensing and optical force in plasmonic dimer antennas
Nonlocal effect on the refractive index sensing and optical force in plasmonic dimer antennas
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对等离激元二聚体天线折射率传感和光力的非局域效应
DOI：
10.1117/12.2323365
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发表时间：
2018-10
期刊：
影响因子：
--
通讯作者：
Li Zhipeng
中科院分区：
文献类型：
--
作者：
Wang Hancong;Huang Shihao;Xie Wenming;Lin Jinyang;Yang Longkun;Li Zhipeng
Localized surface plasmon based on coupled metallic nanoaggregates has been extensively studied in enhancing light scattering and optical force, which depends on the geometry/symmetry of plasmonic oligomers and the refractive index of surrounding medium. As the interparticle gap distance between nanoparticles becomes smaller than several nanometers, quantum effects can change the plasmon coupling in classical predictions. However, most of the research on plasmonic scattering and optical force has been done based on local calculations even for the gap below similar to 3 nm, in which the nonlocal screening plays a vital role. Here, we theoretically investigate the nonlocal effect on the evolution of plasmon resonance modes in strongly coupled nanoparticle dimer antennas with the gap down to 1 nm. Then, the refractive index sensing and optical force in this nonlocal system is evaluated and compared with the results in classical calculations. We find that in the nonlocal regime, both refractive index sensibility factor and optical force are actually smaller than their classical counterparts mainly due to the saturation of both plasmon-shifts and near-field enhancement. These results would be beneficial for the understanding of interaction between light and nonlocal plasmonic nanostructures and the development of plasmonic devices such as nanoantennas, nanosensors, and photonic manipulation.
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影响因子：
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DOI：
10.3390/s140507959
发表时间：
2014-05-05
期刊：
Sensors (Basel, Switzerland)
影响因子：
--
作者：
Tong L;Wei H;Zhang S;Xu H
通讯作者：
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