Tip Enhanced Raman Spectroscopy of Rhodamine 6G on nanostructured gold substrate

Manola Moretti, Gobind Das, Bruno Torre, Marco Allione, Enzo M. Di Fabrizio

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

A new concept based setup for Tip Enhanced Raman Scattering measurement assisted by gold nanostructure is presented, that can provide a platform for gap-mode enhancement of the signal at the single molecule level conjugated with controlled spatial localization of the molecule under investigation and a method to determine the diffraction limit properties of the tip. In essence, this effect is obtained illuminating a gold coated AFM tip which is raster scanned over a nanostructured gold substrate, after chemisorption of a Raman active molecule. We expect that the near-field Raman enhancement would be given by the gap-mode effect of the two facing nano-features. Thanks to the nanostructured substrate, we verify that the resolution of the Raman mapping signal is well below the diffraction limit given by the combination of the optics geometry and the laser wavelength. We show that the gap-mode TERS can generate an estimated field- enhancement (g) of ~20 in localized areas of the sample and we demonstrate the ability to spatially define the molecule position (by Raman mapping) at the tens of nanometers scale. © 2015 Elsevier Ltd.
Original languageEnglish (US)
Pages (from-to)52-56
Number of pages5
JournalOptics and Lasers in Engineering
Volume76
DOIs
StatePublished - May 23 2015

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering
  • Mechanical Engineering

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