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Free keywords:
Goldstone bosons; organic compounds; adsorbed layers; Raman spectra; platinum; iridium; nanotechnology
Abstract:
Tip-enhanced Raman spectroscopy (TERS) is based on the optical excitation of localized surface plasmons in the tip-substrate cavity, which provides a large but local field enhancement near the tip apex. We report on TERS with smooth single crystalline surfaces as substrates. The adsorbates were CN– ions at Au(111) and malachite green isothiocyanate (MGITC) molecules at Au(111) and Pt(110) using either Au or Ir tips. The data analysis yields Raman enhancements of about 4x105 for CN– and up to 106 for MGITC at Au(111) with a Au tip, probing an area of less than 100 nm radius.
