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Accueil > Séminaires > Année 2020 > Séminaire de Tomas Neuman (10 nov 2020)

Séminaire de Tomas Neuman (10 nov 2020)

Institut de physique et de chimie des Matériaux de Strasbourg (IPCMS)

par Martrenchard-Barra Séverine - 19 octobre (modifié le 5 novembre)

Le séminaire sera diffusé en visioconférence. Les personnes extérieures au laboratoire qui souhaitent y assister sont invitées à envoyer un mail à l’adresse

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From plasmon-mediated molecular spectroscopy to molecular quantum technologies

Vibrational, electronic, and spin excitations in molecules can identify molecules in spectroscopy, but also play a role in molecular chemical reactivity, or find technological applications e.g. in superresolution microscopy or infrared-to-optical transduction [1]. Recently, excitations in single molecules and molecular networks have been proposed to serve as physical platforms for qubits or for nanoscale sources of non-classical photon states [2]. To fully take advantage of the molecular platforms it is therefore necessary to elucidate how molecular excitations can be detected, engineered, and controlled, especially on the single- or a few-molecular scale. I will discuss how nanoscale metallic structures supporting collective electronic excitations - plasmons - can be used to enhance the interaction between photons and molecular excitations and thus detect and control them. I will show that plasmon-enhanced infrared and optical vibrational spectroscopies or electroluminescence enhanced by effective plasmonic cavities formed in tunneling metallic gaps can be used to detect and manipulate molecular states, or break well-established spectroscopic selection rules [3]. Full understanding of the plasmon-mediated light-matter interactions also enables novel spectroscopic methods exploiting the correlated information about transport and optical properties of molecules. A particular example of the electroluminescence spectroscopy in scanning tunneling microscope used to elucidate the tautomerization dynamics in free-base phthalocyanine molecules will be discussed [4]. Finally, I will elaborate on the potential of molecules for quantum technologies and the role of plasmon-mediated molecular spectroscopy in this field.

[1] P. Roelli, D. Martin-Cano, T.J. Kippenberg, C. Galland, Physical Review X 10(3), 031057 (2020).
[2] M.R. Wasielewski, M.D.E. Forbes, N.L. Frank, et al., Nature Reviews Chemistry 4(9), 490-504 (2020).
[3] T. Neuman, R. Esteban, D. Casanova, F.J. García-Vidal, J. Aizpurua, Nano letters 18(4), 2358-2364 (2018).
[4] B. Doppagne, T. Neuman, R. Soria-Martinez, et al., Nature Nanotechnology 15(3), 207-211 (2020).