Time-resolved force microscopy using the delay-time modulation method

Abstract

We developed a time-resolved force microscopy technique by integrating atomic force microscopy using a tuning-fork-type cantilever with the delay time modulation method for optical pump-probe light. We successfully measured the dynamics of surface recombination and diffusion of photoexcited carriers in bulk WSe _2 , which is challenging owing to the effect of the tunneling current in time-resolved scanning tunneling microscopy. The obtained results were comprehensively explained with the model based on the dipole-dipole interaction induced by photo illumination.

Keywords

• time-resolved AFM
• SPM
• ultrashort pulse laser
• ultrafast dynamics
• nanoscale science