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Institut des Sciences Moléculaires d'Orsay

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Accueil > Production Scientifique > HDR soutenues > Soutenance d’HDR d’Eric Le Moal (21 juin 2021)

Soutenance d’HDR d’Eric Le Moal (21 juin 2021)

par Martrenchard-Barra Séverine - 11 juin 2021

Nano-Optics in a Scanning Tunneling Microscope : Applications to Plasmonics and Excitonics

The scanning tunneling microscope (STM) is not only a surface science tool capable of producing atomically resolved images of crystal surfaces ; it is also an extraordinary tool for nano-optics. Indeed, the inelastic tunneling current between the STM tip and the sample surface leads to an extremely local excitation of the existing optical modes. Thus, the tip-sample junction may behave as a nanosource of photons, surface plasmon polaritons, or excitons, depending on the nature of the sample. In this dissertation, I introduce some of the unique studies, in particular in plasmonics and excitonics, that this tool may be applied to when STM and optical microscopy are combined in the same instrument. Examples from my research involve the investigation of the eigenmodes of individual plasmonic nanoparticles, the response of plasmonic micro-optical components, the energy-momentum dispersion of polaritons in metasurfaces, and the excitonic properties of two-dimensional semiconductors. Future research directions include a recent collaborative work on single-molecule luminescence spectroscopy in a low-temperature STM under ultrahigh vacuum.

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