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Surface-enhanced Raman scattering from rhodamine 6G on gold-coated self-organized silicon nanopyramidal array

Published online by Cambridge University Press:  06 December 2013

Rui Li
Affiliation:
Institute of Near-Field Optics & Nano Technology, School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, People's Republic of China
Hong Li
Affiliation:
Institute of Near-Field Optics & Nano Technology, School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, People's Republic of China
Shi Pan*
Affiliation:
Institute of Near-Field Optics & Nano Technology, School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, People's Republic of China
Kun Liu
Affiliation:
Institute of Near-Field Optics & Nano Technology, School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, People's Republic of China
Shanshan Hu
Affiliation:
Institute of Near-Field Optics & Nano Technology, School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, People's Republic of China
Lujun Pan*
Affiliation:
Institute of Near-Field Optics & Nano Technology, School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, People's Republic of China
Yingnan Guo
Affiliation:
Institute of Near-Field Optics & Nano Technology, School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, People's Republic of China
Shifa Wu
Affiliation:
Institute of Near-Field Optics & Nano Technology, School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, People's Republic of China
Xufeng Li
Affiliation:
School of Applied Science, Taiyuan University of Science and Technology, Shanxi 030024, China
Jun Liu
Affiliation:
Microelectronics and Solid State Electronics, School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, People's Republic of China
*
a)Address all correspondence to this author. e-mail: span@dlut.edu.cn
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Abstract

This work reports the gold-coated self-organized silicon nanopyramidal array prepared by a wet etching and magnetron sputtering process at room temperature. Scanning electron microscopy was used to detect the morphology of gold films. The surface-enhanced Raman scattering (SERS) spectra of the rhodamine 6G (R6G) molecules adsorbed on a nanoscale gold film were recorded. Experimental results show the relationships between gold film thickness and SERS intensity. A full three-dimensional finite difference time domain calculations were carried out, which compare the experimental results and show agreement with ratios of the SERS enhancement for the different thicknesses of gold films. Furthermore, numerical simulations of the array were conducted for both a real gold metal coating and a perfect electrical conductor to determine whether the SERS enhancement was due to diffraction or plasmonic effects. The sample with the fast fabrication process used in this work could provide a new way to obtain a uniform enhancement and low cost SERS substrate.

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Articles
Copyright
Copyright © Materials Research Society 2013 

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References

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Surface-enhanced Raman scattering from rhodamine 6G on gold-coated self-organized silicon nanopyramidal array
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