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. 2016 Feb 8;3(3):471–477. doi: 10.1021/acsphotonics.5b00707

Figure 1.

Figure 1

(a) Broadband-tunable SERS spectroscopy coupled with dark-field microscopy for single-nanoparticle studies, based on an AOPDF spectral filter. (b) Scattering spectra from a single 60nm gold nanoparticle on a gold mirror. A TPT self-assembled molecular monolayer is used as a spacer. Inset: Dark-field image of a sample highlighting a nanoparticle under study (red circle); scale bar is 1 μm. (c) Surface-enhanced Raman spectra measured on (red) and off (black) a single nanoparticle. Laser excitation wavelength is 630 nm. Inset: Gold nanoparticles on a gold substrate, separated by a 1.4 nm TPT molecular spacer.