Scheme of Direct Near-Field Parameter Assessment of Plasmon Enhanced Probe Spectroscopy (IMAGE)
Caption
On the left side a schematic view of a tip-enhanced Raman scattering (TERS) experiment is shown. A metallized AFM probe is brought in close proximity to a specimen surface, a laser is focused on the tip-sample interface. Such a setup allows to obtain vibrational spectra (Raman spectra) of an extremely small region, as small as a single molecule or even a single bond. An example of so-called Stokes and Anti-Stokes regions of spectra that are obtained by such an experiment is shown on the upper right column. A thorough assessment of the spectra, as shown by the authors, allows to obtain the structure sensitive Raman spectra and synchronously the specific plasmon resonance properties of the particular tip and the respective temperature. This way tip-induced changes during a measurement are revealed consequently improving the comprehension of the experiment significantly.
Credit
by Marie Richard-Lacroix and Volker Deckert
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