Raschke's group develops ultrafast and infrared/THz near-field nano-optical imaging (scattering-SNOM) and tip-enhanced spectroscopy to probe structure, chemistry, and dynamics of quantum and molecular materials with nanometer spatial and femtosecond temporal resolution. For context, this complements the established paradigm of NV-diamond ensemble magnetometry (Hahn-echo/DEER, nanoscale NMR, T1 relaxometry) operating near pT/√Hz sensitivity.