Mobile Raman Sensors for On-Site Measurements to Address Agri-Photonic and Life Science Applications

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.