Coherent anti-stokes Raman scattering spectroscopy (CARS) and imaging of DNA on graphene layers and glass covers

Abstract

Abstract We report a comparative study of the Raman and Coherent anti-Stokes Raman scattering (CARS) patterns of DNA molecules deposited on graphene or glass substrates. In the DNA CARS spectra, the positions of vibrational resonances are red-shifted by 10-20 cm-1 and have new features in high-frequency region in comparison with spontaneous Raman data. We demonstrate that CARS imaging can be employed for the visualization and characterization of DNA molecules deposited on graphene.