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[Fizinfo] Szemináriumok - Seminars: Pápa Zsuzsanna

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  • From: Szeminárium koordinátor <sem-admin AT>
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  • Subject: [Fizinfo] Szemináriumok - Seminars: Pápa Zsuzsanna
  • Date: Thu, 26 Nov 2020 06:26:02 +0100 (CET)
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SZFI SeminarPápa ZsuzsannaWigner FK SZFI, ELI-ALPSUltrafast Probing of
Electron Occupancies of Nanoplasmonic SystemsTuesday, 1 December 2020, 10:00,
video conference, systems are
of great interest due to the nanometric volumes and ultrafast timescales
involved during their excitation and decay. Upon the absorption of a photon,
energy is transferred to the electrons in the metal, thus driving the
electron distribution out of equilibrium. As time evolves on fs scale, a
series of energy redistributions occur where energetic electrons first
scatter among themselves and redistribute their energy until a high
temperature Fermi–Dirac distribution is reached on the scale of hundreds of
femtoseconds. Electron–phonon interactions then lead to a gradual reduction
of this electronic temperature on a picosecond time scale. Due to the
surface-bound nature of plasmons, these light-matter interaction processes
are also worth examining from a new perspective. As the electron occupancies
change during the various processes described above so does the dielectric
function. This means that it is possible to retrieve electron occupancies and
electron energy levels at different stages of plasmon excitation and decay by
measuring the dielectric function of the plasmonic system in a highly
sensitive way. In this presentation, I will report on a new tool for
ultrasensitive probing of plasmonic hot electron occupancies in gold,
applying ultrafast pump-probe spectroscopic ellipsometry. &nbsp;Minden
érdeklődőt szívesen látunk! - Everyone is welcome to attend.Róbert
Juhászsem-admin AT

  • [Fizinfo] Szemináriumok - Seminars: Pápa Zsuzsanna, Szeminárium koordinátor, 11/26/2020

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