Abstract

Raman spectroscopy is a well-established non-invasive and label-free optical technique for molecule-specific analysis in various application fields. However, disturbing contributions like laser-induced fluorescence or ambient lights can easily mask the weak Raman signals. Shifted excitation Raman difference spectroscopy (SERDS) using two laser excitation wavelengths within a narrow spectral range can effectively address this issue. Here, the Raman signals follow the change in the excitation wavelength while the background signals remain unchanged.

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