Speaker
Prof.
Niek F. van Hulst
(ICFO - the Institute of Photonic Sciences)
Description
We present the first ultrafast transient absorption of a single molecule. Specifically, we trace the femtosecond evolution of excited electronic state spectra of single molecules over hundreds of nanometers of bandwidth at room temperature. The non-linear ultrafast response of the single molecule is probed using a broadband laser in an effective 3-pulse scheme with fluorescence detection. A first excitation pulse is followed by a phase-locked de-excitation pulse-pair, providing spectral encoding while preserving 25 fs temporal resolution. This experimental realization of true single molecule transient absorption spectroscopy demonstrates that two-dimensional electronic spectroscopy of single molecules is experimentally in reach.
Primary author
Prof.
Niek F. van Hulst
(ICFO - the Institute of Photonic Sciences)
