中国物理B ›› 2016, Vol. 25 ›› Issue (8): 83301-083301.doi: 10.1088/1674-1056/25/8/083301

• ATOMIC AND MOLECULAR PHYSICS • 上一篇    下一篇

FDTD simulation study of size/gap and substrate-dependent SERS activity study of Au@SiO2 nanoparticles

Jing-Liang Yang(杨晶亮), Ruo-Ping Li(李若平), Jun-He Han(韩俊鹤), Ming-Ju Huang(黄明举)   

  1. Key Laboratory of Informational Opto-Electronical Materials and Apparatus, School of Physics and Electronics, Henan University, Kaifeng 475004, China
  • 收稿日期:2015-11-19 修回日期:2016-04-19 出版日期:2016-08-05 发布日期:2016-08-05
  • 通讯作者: Ming-Ju Huang E-mail:mingjuh@163.com
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 61177004).

FDTD simulation study of size/gap and substrate-dependent SERS activity study of Au@SiO2 nanoparticles

Jing-Liang Yang(杨晶亮), Ruo-Ping Li(李若平), Jun-He Han(韩俊鹤), Ming-Ju Huang(黄明举)   

  1. Key Laboratory of Informational Opto-Electronical Materials and Apparatus, School of Physics and Electronics, Henan University, Kaifeng 475004, China
  • Received:2015-11-19 Revised:2016-04-19 Online:2016-08-05 Published:2016-08-05
  • Contact: Ming-Ju Huang E-mail:mingjuh@163.com
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 61177004).

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摘要： We use Au@SiO2 nanoparticles (NPs) to systematically and comprehensively study the relationship between nanostructure and activity for surface-enhanced Raman scattering. Calculation simulation using the finite different time domain method verifies the experiment results and further reveals that the particle size and the distance between the NPs play vital roles in the surface-enhanced Raman scattering (SERS). Furthermore, in order to better simulate the real experiment, a Au@SiO2 nanosphere dimer is placed on the silicon substrate and Au substrate, separately. The simulation results show that the large EM field coupling is due to the “hot spots” transferred from the NP-NP gaps to NP-surface of metal gaps, meanwhile, more “hot spots” occur. We also find that the signal intensity strongly depends on the position of the probe molecule. This work provides a better understanding of EM field enhancement.

关键词: Au@SiO2 NPs, FDTD, SERS, EM coupling

Abstract: We use Au@SiO2 nanoparticles (NPs) to systematically and comprehensively study the relationship between nanostructure and activity for surface-enhanced Raman scattering. Calculation simulation using the finite different time domain method verifies the experiment results and further reveals that the particle size and the distance between the NPs play vital roles in the surface-enhanced Raman scattering (SERS). Furthermore, in order to better simulate the real experiment, a Au@SiO2 nanosphere dimer is placed on the silicon substrate and Au substrate, separately. The simulation results show that the large EM field coupling is due to the “hot spots” transferred from the NP-NP gaps to NP-surface of metal gaps, meanwhile, more “hot spots” occur. We also find that the signal intensity strongly depends on the position of the probe molecule. This work provides a better understanding of EM field enhancement.

Key words: Au@SiO2 NPs, FDTD, SERS, EM coupling

中图分类号:  (Raman and Rayleigh spectra (including optical scattering) ?)

  • 33.20.Fb
47.54.Bd (Theoretical aspects) 47.54.Jk (Materials science applications) 52.38.-r (Laser-plasma interactions)