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.

Abstract

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