SPRs are also used in imaging techniques to improve the resolution and contrast. One such technique is surface-enhanced Raman scattering (SERS), where the Raman signal of molecules near a metal nanoparticle is greatly amplified due to the enhanced electromagnetic field. This allows for the detection of single molecules and provides detailed chemical information. SPRs can also be used in other imaging methods such as dark-field microscopy and near-field scanning optical microscopy (NSOM), where they help in visualizing nanoscale features with high spatial resolution.
