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DTSTART;TZID=Europe/Paris:20240516T140000
DTEND;TZID=Europe/Paris:20240516T153000
DTSTAMP:20260417T110939
CREATED:20240512T114028Z
LAST-MODIFIED:20240513T080440Z
UID:10266-1715868000-1715873400@fermi.univ-tlse3.fr
SUMMARY:Confined hyperbolic phonon-polaritons in Van der Waals crystals  . - ( Sébastien Francoeur / LPCNO / Seminar). - 16/05/2024\, 14H
DESCRIPTION:Sébastien Francoeur\,  Université Polytechnique de Montréal\, Canada \nSéminaire LPCNO\, seminar room\, INSA\, Build. 27\, Room 2.20 (2nd floor left) \nSummary \nStrong coupling between an electromagnetic wave and a solid-state polar excitation yields hybrid quasiparticles known as polaritons. Owing to their mixed light-matter characteristics\, polaritons express distinctive properties and enable a unique level of control over light\, matter\, and their interactions. Phonon-polaritons results from the coupling of polar transverse optical phonons with light. In strongly anisotropic nanostructures\, they exhibit a hyperbolic dispersion relation from which high-momentum states become accessible\, providing the means to achieve extreme energy confinement and a large density of states enhancements\, thereby providing new functionalities for IR sensing\, low-loss photonic circuits\, and new regimes of light-matter interactions. \nIn this presentation\, I will delve into the science of hyperbolic photon-polaritons\, illustrating their significance and exploring some of their most promising applications. I will also describe why almost all advances in this field have been driven by a single measurement technique for the last two decades: scattering-type near-field microscopy. Then\, I will then undertake two discussions that may play a role in accelerating key developments in this field: \n\nI will experimentally demonstrate how Raman spectroscopy\, a simple\, convenient\, and widely used technique can be used to investigate phonon-polariton dispersion relations\, strong confinement\, and coupling to other solid-state excitations such as excitons.\nI will introduce a promising polaritonic material\, GaSe\, characterized by low-propagation losses and confinement factors matching or surpassing those reported for other Van der Waals crystals.\n\n 
URL:https://fermi.univ-tlse3.fr/event/confined-hyperbolic-phonon-polaritons-in-van-der-waals-crystals-sebastien-francoeur-lpcno-seminar-16-05-2024-14h/
LOCATION:Salle 220\, LPCNO\, INSA – LPCNO : 135 avenue de Rangueil\, toulouse\, 31077\, France
CATEGORIES:Events,LPCNO,Seminars
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