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Title: Darkfield microspectroscopy of nanostructures on silver tip-enhanced Raman scattering probes

We report an evaluation method employing darkfield microspectroscopy for silver probes used in tip-enhanced Raman scattering (TERS). By adjusting the darkfield illumination, the diffracted light from the probe outlines disappears and the diffracted light from the surface nanostructures and tips of the probes appears as colorful spots. Scanning electron microscopy reveals that the spectral variations in these spots reflect the shapes of the surface nanostructures. The tip curvatures correlate to the spectral maxima of their spots. Temporal color changes in the spots indicate the deterioration due to the oxidation of the silver surfaces. These results show that the proposed method is useful for in situ evaluation of plasmonic properties of TERS probes.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ; ;  [5]
  1. Nano-Bioanalysis Team, Health Technology Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Takamatsu, Kagawa 761-0395 (Japan)
  2. Research Fellow of the Japan Society for the Promotion of Science, Chiyoda, Tokyo 102-8472 (Japan)
  3. (Japan)
  4. UNISOKU Co. Ltd., 2-4-3 Kasugano, Hirakata, Osaka 573-0131 (Japan)
  5. Department of Chemistry, School of Science and Technology, Kwansei Gakuin University, Sanda, Hyogo 669-1337 (Japan)
Publication Date:
OSTI Identifier:
22489278
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 108; Journal Issue: 2; Other Information: (c) 2016 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ILLUMINANCE; NANOSTRUCTURES; OXIDATION; RAMAN EFFECT; SCANNING ELECTRON MICROSCOPY; SHAPE; SILVER; SURFACES; VARIATIONS