Mr. Wang Ming-li Profile

Wang Ming-li

at Yanshan Univ

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Proceedings Article | 21 August 2013 Paper

Analysis of the size dependent SERS active of Au@SiO2 core-shell nanoparticles by 3D-FDTD simulation

Ming-Li Wang, Xi-Li Jing, Lin Shen

Proceedings Volume 8908, 890807 (2013) https://doi.org/10.1117/12.2031838

KEYWORDS: Surface enhanced Raman spectroscopy, Nanoparticles, Plasma, Optical simulations, Scattering, Raman spectroscopy, Absorption, Raman scattering, Finite-difference time-domain method, Tissue optics

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Au@SiO₂ is a common type of core-shell nanomaterials. It has plasma resonance properties due to strong optical absorption and optical scattering. The plasma resonance frequency can be adjusted by altering core-shell relative size. These were used widely in the SERS studies. In this paper, the three dimensional finite difference time domain (3D-FDTD) method was employed to simulate the size dependent SERS active of Au@SiO₂ nanoparticles．Under 632.8nm laser excitation, the results showed that the SERS activity had the best effect when the diameter of Au-core was about 140 nm. In the meantime, the different shell thickness and nanoparticles gap was simulated. The results showed that the SERS electric field intensity decreased rapidly with the increase of thickness and gap, until the shell thickness increases to 20 nm or the nanoparticals gap increases to 30 nm. Compared with other experimental results, our theoretical calculation results and experimental matched very well. This indicated that the 3D-FDTD method in this paper was accurate and reliable. Our results show that we can obtain better enhancement effect by selecting the appropriate sizes and gap of Au@SiO₂ core-shell nanoparticles. The simulation results of this paper have a strong guiding significance to experiment, and which can improve the SERS study efficiency and the development process.

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