ELFT HÍRADÓ

[<vera.horvath AT eli-alps.hu>]

Előadók: Budai Judit és Pápa Zsuzsanna (ELI ALPS)
Cím: Optical probing of plasmonic hot electron occupancies
Időpont: 2021. március 26., 9 óra

Az előadás kivonata:
Hot electron generation upon the excitation of surface plasmon polaritons
plays a key role in emerging applications such as photocatalysis, light
harvesting and sensorics. In this seminar talk, we will discuss the time
evolution and in depth distribution of such hot carriers. For this purpose, we
demonstrate an experimental method to directly measure plasmon-associated
changes in dielectric properties of metallic surfaces utilizing spectroscopic
ellipsometry. Monitoring these changes in the dielectric function allows us to
follow changes in the electron distribution. Pump-probe and continuous wave
experiments revealed different aspects of plasmon generation. Pump-probe
ellipsometric approach with <100 fs resolution enabled us to identify the
different stages of plasmon decay through which electrons are scattered among
each other and interact with the lattice. For continuous wave illumination,
hot electrons are always present in the system, therefore the spectral
signature of a hot electron population and its spatial location within the
plasmonic thin film can be determined using the retrieved dielectric function
from cw measurements.

Csatlakozni a következő link használatával lehet:
https://teams.microsoft.com/l/meetup-join/19%3ameeting_M2ZjNjBhYTMtM2VjYy00NDJhLThmZDYtMjE0N2Q1ODk2ODEy%40thread.v2/0?context=%7b%22Tid%22%3a%22b207389a-c5cb-4cb0-a1ad-227b94e96448%22%2c%22Oid%22%3a%22a12feac4-37de-4e24-89e9-c7833f7e5a28%22%2c%22IsBroadcastMeeting%22%3atrue%7d&btype=a&role=a

A szeminárium angol nyelvű. Minden érdeklődőt szívesen látunk.

Üdvözlettel:
 Horváth Vera