Dresden 2020 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 83: Poster Session - Plasmonics and Nanooptics: Light-Matter Interaction, Spectroscopy

O 83.5: Poster

Mittwoch, 18. März 2020, 18:15–20:00, P2/EG

Step towards Two Dimensional Electronic Spectroscopy (2DES) of a single molecule using fluorescence based detection scheme — •Sanchayeeta Jana, Christoph Schnupfhagn, and Markus Lippitz — Experimental Physics III, University of Bayreuth, Bayreuth, Germany

2DES is an ultrafast spectroscopic technique which can give us the information about the couplings between the molecular energy levels due to the added dimensionality. This technique uses two replicas of an ultrashort laser pulse with controllable delay between them to excite the sample and a third pulse probes the excited sample after some time. But performing this kind of experiments on a single molecule is extremely difficult since the absorption cross section of a single molecule is much smaller than the probe volume resulting very low signal to background noise ratio. To overcome this, fluorescence based detection scheme can be used where fluorescence from the excited state is measured using an additional 4th pulse.

In this work, we describe the experimental challenges for such an experiment on a single molecule and propose the convenient procedure to overcome those.