Ultrafast pump-probe force microscopy with nanoscale resolution

Jahng, J., Brocious, J., Fishman, D., Yampolsky, S., Nowak, D., Huang, F., Apkarian, V., Wickramasinghe, H., Potma, E.
Appl. Phys. Lett.


We perform time-resolved pump-probe microscopy measurements by recording the local force between a sharp tip and the photo-excited sample as a readout mechanism for the material’s nonlinear polarization. We show that the photo-induced force is sensitive to the same excited state dynamics as measured in an optical pump-probe experiment. Ultrafast pump-probe force microscopy constitutes a non-optical detection technique with nanoscale resolution that pushes pump-probe sensitivities close to the realm of single molecule studies.

DOI: 10.1063/1.4913853