Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Statut Confirmé
Domaines cond-mat
Date Lundi 27 Janvier 2020
Heure 13:30
Institut LPENS
Salle Conf IV
Nom de l'orateur De Wilde
Prenom de l'orateur Yannick
Addresse email de l'orateur
Institution de l'orateur Institut LANGEVIN, ESPCI Paris - PSL University - CNRS
Titre Plasmonic studies in the infrared at sub-wavelength scales
Résumé This presentation will give a review of the studies performed on plasmonic systems in the infrared at the Langevin Institute. We will show the adaptation of scattering-type near-field scanning optical microscopy to the detection of the field produced on active plasmonic devices, and then using the sole thermal radiation of a sample in a mode called thermal radiation scanning tunneling microscopy. Detecting the thermal radiation in the near field has allowed one to probe the electromagnetic local density of states and to reveal extraordinary coherence effects associated with surface polaritons, giving rise to non-Planckian thermal radiation spectra. The TRSTM method has been applied to investigate plasmonic materials and also more recently to study individual metal-insulator-metal plasmonic antennas. In the latter case, infrared spatial modulation spectroscopy has allowed one to measure the thermal radiation spectra of the subwavelength sized resonators, while suppressing the background radiation which is generally so overwhelming that it prevents one to measure the thermal radiation spectrum from small objects with a Fourier transform infrared spectrometer.
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