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Sub-molecular fluorescence microscopy with STM - Guillaume Schull - Jeudi 11 mars 2021 à 11h00

En visioconférence

Guillaume Schull - Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS)

Abstract

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 [1] 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 [2] to track the motion of hydrogen atoms within free-based phthalocyanine molecules [3], and to address energy transfers between complex chromophore architectures [4]. Together with other recent reports [5,6], these results constitute an important step towards photonic measurements with atoms-scale resolution.

[1] B. Doppagne et al., Phys. Rev. Lett. 118, 127401 (2017) [2] B. Doppagne et al. Science, 361, 251 (2018) [3] B. Doppagne et al. Nature Nanotechnol.15, 207(2020). [4] S. Cao et al. In press (arXiv:2101.01105) [5] Y. Zhang et al. Nature 531, 623 (2016) [6] H. Imada et al., Nature 538, 364 (2016) Zewail, A. H., Science, 2010, 328, 187-193