Nonlocal effect on the refractive index sensing and optical force in plasmonic dimer antennas

Hancong Wang; Shihao Huang; Wenming Xie; Jinyang Lin; Longkun Yang; Zhipeng Li

doi:10.1117/12.2323365

25 October 2018 Nonlocal effect on the refractive index sensing and optical force in plasmonic dimer antennas

Hancong Wang, Shihao Huang, Wenming Xie, Jinyang Lin, Longkun Yang, Zhipeng Li

Proceedings Volume 10824, Plasmonics III; 1082404 (2018) https://doi.org/10.1117/12.2323365
Event: SPIE/COS Photonics Asia, 2018, Beijing, China

Abstract

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 ~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.

Citation Download Citation

Hancong Wang, Shihao Huang, Wenming Xie, Jinyang Lin, Longkun Yang, and Zhipeng Li "Nonlocal effect on the refractive index sensing and optical force in plasmonic dimer antennas", Proc. SPIE 10824, Plasmonics III, 1082404 (25 October 2018); https://doi.org/10.1117/12.2323365

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