SKM 2023 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 76: Plasmonics and Nanooptics III: Light-Matter Interaction and Spectroscopy II

O 76.6: Vortrag

Donnerstag, 30. März 2023, 11:45–12:00, WIL A317

A Setup for Fluorescence-Detected Two-Dimensional Electronic Spectroscopy of Single Molecules — •Sanchayeeta Jana, Simon Durst, Lucas Ludwig, and Markus Lippitz — Chair for Experimental Physics III, University of Bayreuth, Bayreuth, Germany

Fluorescence-Detected Two-Dimensional Electronic Spectroscopy is a recent ultrafast technique that yields information about the coupling between the states of a system. At the same time, fluorescence-detected single molecule spectroscopy is a well-established technique since more than 30 years. By combining these two techniques one should be able to measure 2d spectra of single molecules to get new insight in molecular dynamics on ultrashort time scales.

Here we present our work towards this goal. We use four phase-modulated ultrafast pulses to excite the molecule with the help of a high NA objective. The fluorescence is registered by single-photon detectors and demodulated at several mixing frequencies to get the rephasing and non-rephasing signals. The novelty of our technique is that we can measure Fluorescence Correlation Spectroscopy (FCS) and Time-Correlated Single Photon Counting (TCSPC) simultaneously to monitor the number of molecules in our excitation focus and the fluorescence lifetime.

In this work we illustrate our experimental technique and discuss 2d spectra measured on a molecular sample at low concentration.