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Experimental setup of tip-enhanced Raman spectroscopy. DM: dichoic mirror; BS: beamsplitter; BF: bandpass filter; M: reflect mirror; PC: polarization converter.
(Color online) Three-dimensional FEM simulation of electric field distribution in the vicinity of the tip over the dye-sensitized nanoparticle. (a) Crosssection through the detail of a finite element mesh. (b) Scanning electron micrography of the silver-coated AFM tip. (c) Near-field distribution of the electric field in the vicinity of the silver-coated AFM tip apex. (d) Near-field distribution of the electric field of a nanoparticle on a glass surface without an AFM tip. Vectors of and represent the laser-beam propagation vector and the electric field vector, respectively. In our calculations, the distance between the metallic tip and sample was and the spherical apex of the AFM tip was in diameter.
Absorption spectra in an aqueous solution at H 3: (a) alone; (b) N3 alone; and (c) complex.
Tip-enhanced Raman spectroscopy and AFM characterization of the N3-sensitized nanoparticles: (a) Raman spectrum without a tip; (b) Raman spectrum with a silver-coated AFM tip; (c) near-field Raman spectrum; and (d) an AFM image. The marked part in the AFM image corresponds to the nanoscale site where the near-field Raman spectrum was collected.
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