Figure (IMAGE)

Science China Press

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(a) Schematic of scanning Raman picoscopy (SRP). When a laser beam is focused into the nanocavity between the atomistically sharp tip and substrate, a very strong and highly localized plasmonic field will be generated, dramatically enhancing the Raman scattering signals from the local chemical groups in a single molecule right underneath the tip. (b) Merged SRP image by overlaying four typical Raman imaging patterns shown on the right insets for four different vibrational modes. (c) Artistic view of the Mg-porphine molecule showing how four kinds of chemical groups (colored "Legos") are assembled into a complete molecular structure.

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