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SUMMARY:A statistical physics approach to light emission by nonequilibirum
  systems: the generalized Kirchhoff law
DTSTART:20240712T110000
DTSTAMP:20260416T071230Z
UID:43f09619fafe4c3d01ca97db52963dea819d59c1d830ffbcba6a8655
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Jean-Jacques Greffet (Institut d’Optique Paris-Saclay)
 \n\n\n\n\n\n\n\nIn this talk\, we discuss several light emission processes
  which are still not fully understood. While metals do not fluoresce due t
 o the lack of a band gap\, metallic nanoparticles pumped by a laser may em
 it visible light. Several mechanisms have been suggested to explain this e
 ffect often called metal photoluminescences [1].  Inelastic tunneling of 
 electrons between two metals across a barrier may emit light. While this p
 henomenon has been reported in 1976\, several observations have remained u
 nexplained [2]. Finally\, the observation of photon condensation in pumped
  semiconductor cavities has remained elusive. In this talk\, we introduce 
 a statistical model of light emission which enables to discuss these issue
 s [3]. The starting point is the derivation of a fluctuating relation conn
 ecting the nonequilibrium electronic distribution with the current density
  correlation function. We then show how this approach leads to a generaliz
 ed form of the Kirchhoff law [4].   \n\n \n\n1. Loirette-Pelous A. & Gr
 effet J.-J.\, Theory of Photoluminescences by Metallic Structures\, to be 
 submitted\n\n2. Muniain U. et al.\, Unified treatment of Light Emission by
  Inelastic Tunneling: Interaction of Electrons and Photons beyond the Gap\
 , Phys. Rev. X 14\, 021017 (2024)\n\n3. Loirette-Pelous A. & Greffet J.-J.
 \, Photon Bose-Einstein Condensation and Lasing in Semiconductor Cavities\
 , Laser & Photonics Reviews\, 2300366 (2023)\n\n4. Greffet J.-J et al.\, L
 ight Emission by Nonequilibrium Bodies: Local Kirchhoff Law\, Phys. Rev. X
  8\, 021008 (2018)\n\n\n\n\n\n
LOCATION:CE 1 103 https://plan.epfl.ch/?room==CE%201%20103
STATUS:CONFIRMED
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