Individual Split Au Square Nanorings for Surface-Enhanced Raman and Hyper-Raman Scattering |
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Authors: | Zhang RuXin Du ChaoLing Sun Lu Rong WangXu Li Xiang Lei MingXin Shi DaNing |
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Affiliation: | 1.College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing, 211100, China ;2.Key Laboratory of Aerospace Information Materials and Physics, Ministry of Industry and Information Technology, Nanjing, 210016, China ; |
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Abstract: | In this paper, individual split Au square nanorings were numerically proposed as novel substrates for surface-enhanced Raman and hyper-Raman scattering (SERS and SEHRS) simultaneously. The peak wavelengths of their localized surface plasmon resonance (LSPR) fall in the near-infrared and visible light regions, respectively, which are able to be finely tuned to match well with the wavelengths of the incident laser and hyper-Raman scattered light beams. Their SEHRS and SERS performances along with electromagnetic (EM) field distributions are numerically investigated by finite element method. With the enhancement of near electric-fields generated by LSPRs, the maximum SEHRS and SERS enhancement factors are demonstrated to reach 1.22?×?1012 and 108, respectively. Meanwhile, the corresponding SERS-based refractive index (RI) sensitivity factor reaches as high as 258 nm/RIU and 893 nm/RIU, at visible and near-infrared wavelengths, respectively. The proposed structure holds great promise both for developing SEHRS- and SERS-based RI sensing substrates, which shows strong potential applications in nanosensing and enhanced Raman scattering. |
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