4 years ago

Enhanced Light Emission from Plasmonic Nanostructures by Molecules

Enhanced Light Emission from Plasmonic Nanostructures by Molecules
Guowei Lu, Aiqin Hu, Yuqing Cheng, Guantao Li, Jingyi Zhao, Te Wen, Qihuang Gong, Jianning Xu
Light emission from plasmonic nanostructures can be enhanced by accompanying molecular Raman scattering during surface-enhanced Raman scattering (SERS). The interaction between the nanostructure and the molecule was modeled based on the concept of quantized optical cavity. We found that the plasmonic nanostructures can elastically scatter the energy coupling from the molecules, resulting in significantly enhanced molecule Raman scattering. Meanwhile, part of the coupling energy was inelastically radiated through plasmon emission, resulting in a slight enhancement in background emission. By comparing a single nanoparticle experiment and theoretical calculations, we reveal that the light emission enhancement from the nanostructures is ascribed mainly to the increase in local field felt by the nanostructures. Because the “hot spot” resulting from the nanostructures can strongly polarize the molecules, the induced field of the polarized molecules influences the local field in turn. These findings contribute to the deeper understanding of surface-enhanced Raman scattering and suggest that plasmonic nanostructures and molecules are considered as a hybrid entity to analyze and optimize surface-enhanced spectroscopy.

Publisher URL: http://dx.doi.org/10.1021/acs.jpcc.7b08179

DOI: 10.1021/acs.jpcc.7b08179

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