Gold Nanoparticles as Probes for Nano-Raman Spectroscopy: Preliminary Experimental Results and Modeling

Figure 4

A schematic of the tip-enhanced Raman setup with an image of the tip-surface area (inset). The sharp gold tip is scanned through a strongly focused laser beam. The optical signal is detected by combining a spectrometer and a CCD detector. The axis of the illuminating/collecting optics is positioned at 55° with respect to the tip axis.