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Guillaume Schull “From single-molecule fluorescence to photosynthesis with an STM”
March 28 @ 4:30 pm
Université de Strasbourg, CNRS, IPCMS, UMR 7504, Strasbourg, France
The electric current traversing the junction of a scanning tunneling microscope (STM) may lead to a local emission of light that can be used to generate sub-molecularly resolved fluorescence maps of individual molecules. Combined with spectral selection and time-correlated measurements, this hyper-resolved fluorescence microscopy approach allowed us to scrutinize the vibronic structure of individual molecules  in a very similar way than in the recent TERS reports, without requiring an optical excitation. We used this approach to characterize the photonics properties of charged species , to track the motion of hydrogen atoms within free-based phthalocyanine molecules , and more recently to follow resonance energy transfers between individual pigments, exploring processes occurring in photosynthetic complexes with sub-molecular spatial resolution .
These results constitute an important step towards photonic measurements with atoms-scale resolution .
Exploring energy transfers occurring in leafs with a scanning tunneling microscope.
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