Tuning the resonance frequency of Ag-coated dielectric tips

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Author(s) Cui, Xudong, Zhang, Weihua, Yeo, Boon-Siang, Zenobi, Renato, Hafner, Christian, Erni, Daniel
Publication Type Journal Items, Publication Status: Published
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Title Tuning the resonance frequency of Ag-coated dielectric tips
Author(s) Cui, Xudong
Zhang, Weihua
Yeo, Boon-Siang
Zenobi, Renato
Hafner, Christian
Erni, Daniel
Journal or Series Title Optics express
Volume Number 15
Issue Number 13
Start Page 8309
End Page 8316
ISSN 1094-4087
Publisher Optical Society of America
Publication Place Washington, DC
Publication Date 2007-00-00
Abstract A finite element model was built to investigate how to optimize localized plasmon resonances of an Ag-coated dielectric tip for tip-enhanced Raman spectroscopy (TERS). The relation between the resonance frequency, the electric field enhancement and the optical constant of the dielectric tip was numerically investigated. The results show that increasing the refractive index of the dielectric tip can significantly red shift the localized plasmon modes excited on the Ag-coated dielectric tip, and consequently alter the field enhancement. Moreover, the influence of the width of the resonance on the Raman enhancement was also considered. When taking all the factors into account, we find that an Ag- coated low-refractive index dielectric tip provides the best Raman enhancement in the blue-green spectral range. This is consistent with our prior experimental results.
DOI 10.1364/OE.15.008309
Additional Notes Received 11 May 2007, Revised 4 June 2007, Accepted 6 June 2007, Published online 18 June 2007
Document Type Article
Publication Status Published
Language English
Assigned Organisational Unit(s) 03472
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NEBIS System Number 001934332
Source Database ID PP-34150
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  author = "Cui, Xudong and Zhang, Weihua and Yeo, Boon-Siang and Zenobi, Renato and Hafner, Christian and Erni, Daniel",
  title = "{T}uning the resonance frequency of {A}g-coated dielectric tips",
  journal = "Optics express",
  year = 2007,
  volume = "15",
  number = "13",
  pages = "8309--8316",

E-Citations record created: Thu, 01 Apr 2010, 18:35:04 CET