Ultrafast spectroscopy of aerosol particles and microcavities
type: Dataset
description: We have developed a real-time optical technique that discriminates bioaerosols among urban background aerosols, especially soot emitted by diesel engines. This technique is based on the multipulse ultrashort excitation of instrinsic fluorophors of bioaerosols and identifies their molecular dynamics. Specific fingerprints of bacteria and hydrocarbons could be exhibited. This study is a first step towards the all-optical identification of biological material. Pump-probe spectroscopy has also been employed to probe the propagation dynamics of a femtosecond pulse in a 2D spiral-shaped microcavity. An imaging technique using pulse correlation has been developed to visualize with femtosecond time resolution the propagation of a wavepacket in the microcavity. FDTD simulations have enabled to interpret our observations and to exhibit an original output coupling process, that implies the reflexion of the evanecent wave on the discontinuity of the spiral.
landing page: https://theses.hal.science/tel-00082047
keyword: bio-aerosols
keyword: bioaerosols
keyword: femtosecond-laser-pulses
keyword: filamentation
keyword: impulsions-laser-femtoseconde
keyword: infoeu-reposemanticsdoctoralthesis
keyword: micro-droplet
keyword: micro-goutte
keyword: microcavites
keyword: microcavities
keyword: modes-de-galerie
keyword: physphysphys-atom-phphysics-physicsphysics-physicsatomic-physics-physicsatom-ph
keyword: physphysphysics-physicsphysics-physics
keyword: plasma
keyword: theses
keyword: whispering-gallery-modes
issued: 2026-05-11T05:24:32.562958
modified: 2026-05-11T05:24:32.562965
language: fr
contact point: Organization
  fn: CCSD

test_moissonnage_selune
type: Agent

Ultrafast spectroscopy of aerosol particles and microcavities
type: Distribution
format: HTML
access URL: https://theses.hal.science/tel-00082047
issued: 2026-05-11T05:24:32.596269
modified: 2026-05-11T05:24:32.536522