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Proceedings Paper

Near-field Raman spectroscopy using a tetrahedral SNOM tip
Author(s): Stefan Klein; Joachim Reichert; Harald Fuchs; Ulrich Fischer
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Paper Abstract

An example of near-field Raman spectroscopy based on the tip-enhancement at an apertureless tetrahedral scanning near-field optical tip (t-tip) is presented. Tip-enhanced Raman spectroscopy (TERS) is based on the excitation of localized surface plasmons (LSP) in the cavity of tip and surface. The LSP provide a highly confined and large field enhancement at the tip apex which allows molecular spectroscopy at the nanoscale. The t-tip consists, in contrast to other TERS configurations which use opaque tips, of a gold coated glass tip which is irradiated from the inside. We demonstrate TERS spectra of the dye malachite green isothiocyanate and show an increased bleaching of the dye in presence of the tip. Data analysis show that the actual experimental conditions support moderate enhancement of the Raman signal.

Paper Details

Date Published: 20 April 2006
PDF: 7 pages
Proc. SPIE 6195, Nanophotonics, 61951F (20 April 2006); doi: 10.1117/12.662561
Show Author Affiliations
Stefan Klein, Westfälische Wilhelms Univ. Münster (Germany)
Joachim Reichert, Westfälische Wilhelms Univ. Münster (Germany)
Harald Fuchs, Westfälische Wilhelms Univ. Münster (Germany)
Ulrich Fischer, Westfälische Wilhelms Univ. Münster (Germany)

Published in SPIE Proceedings Vol. 6195:
David L. Andrews; Jean-Michel Nunzi; Andreas Ostendorf, Editor(s)

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