Abstract
AbstractLaser light, illuminating surface‐enhanced Raman scattering‐active nanostructured CeO2/Al/Al2O3 thin‐film samples with reporter molecules/Au nanoparticle conjugates on the CeO2 surface, may cause irreversible modifications of the conjugates and of the surface structure field‐enhancing properties. As a result, the observed Raman signal decreases or vanishes. The limits of the laser light intensity suitable for nondestructive spectroscopic studies have been assessed using continuous and quasi‐continuous wave (mode‐locked ps‐pulse) laser radiation at different wavelengths. This radiation was used as a pump for linear and nonlinear Raman microspectroscopy of reporter molecules adsorbed on the surface of such a plasmonic metamaterial. Reducing laser power below certain levels allowed reproducible mapping of surface‐enhanced Raman scattering and surface‐enhanced coherent anti‐Stokes Raman scattering signal strengths at the reporter molecule Raman shifts.
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