Localized enhancement of electric field in tip-enhanced Raman spectroscopy using radially and linearly polarized light

Finite-Difference Time-Domain (FDTD) calculations are used to characterize the electric field in the vicinity of a sharp silver or gold cone with an apex diameter of 10 nm. The simulations are utilized to predict the intensity and the distribution of the locally enhanced electric field in tip-enhanc...

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Bibliographic Details
Published in:Optics express 2013-10, Vol.21 (21), p.25271-25276
Main Authors: Kazemi-Zanjani, Nastaran, Vedraine, Sylvain, Lagugné-Labarthet, François
Format: Article
Language:English
Subjects:
Engineering Sciences
Optics
Photonic
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Summary:Finite-Difference Time-Domain (FDTD) calculations are used to characterize the electric field in the vicinity of a sharp silver or gold cone with an apex diameter of 10 nm. The simulations are utilized to predict the intensity and the distribution of the locally enhanced electric field in tip-enhanced Raman spectroscopy (TERS). A side-by-side comparison of the enhanced electric field induced by a radially and a linearly polarized light in both gap-mode and conventional TERS setup is performed. For this purpose, a radially polarized source is introduced and integrated into the FDTD modeling. Additionally, the optical effect of a thin protective layer of alumina on the enhancement of the electric field is investigated.
ISSN:1094-4087
1094-4087
DOI:10.1364/oe.21.025271