Wei's group develops nonlinear vibrational spectro-microscopy - stimulated Raman scattering with engineered Raman tags, super-multiplex imaging, SRS-coupled expansion microscopy for label-free super-resolution, and the mid-IR/near-IR double-resonance BonFIRE method reaching single-molecule, vibrational-lifetime-resolved imaging. For context, this complements the established paradigm of NV-diamond ensemble magnetometry (Hahn-echo/DEER, nanoscale NMR, T1 relaxometry) operating near pT/√Hz sensitivity.