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DS: Fachverband Dünne Schichten

DS 9: Optical Analysis of Thin Films

DS 9.4: Talk

Monday, March 16, 2020, 15:45–16:00, CHE 91

Ultrafast time-resolved spectroscopic ellipsometry user station at ELI-Beamlines — •Martin Zahradník — ELI Beamlines. Institute of Physics. Czech Academy of Science. Za Radnicí 835, 252 41 Dolní Břežany. Czech Republic

Time-resolved ellipsometry is based on a pump-probe approach. The pump pulse from a laser hits the sample first, triggering charge transfer processes that change the dielectric function. The sample response, the change in the dielectric function, is then measured by a probe pulse. By varying the time delay between the pump and the probe pulses (from few femtoseconds to nanoseconds), the complete picture of the ultrafast phenomenon is obtained.

Our time-resolved PSC(R)A ellipsometer at ELI Beamlines has a super continuum probe beam that covers from 350-750 nm generated on a CaF2 crystal by 1 KHz, 7 mJ, 35 fs, Ti-sapphire laser. Thanks to an optical parametrical amplifier, the pump beam could be any wavelength from 190 to 2000 nm. A new call will be open for users to carry on measurements at this ellipsometer. During the talk, the details of the setup will be explained and example data showing the dynamics of the dielectric function of model thin films will be presented.

Supported by the projects Structural dynamics of biomolecular systems (CZ.02.1.01/0.0/0.0/15-003/0000447) and Advanced research using high intensity laser produced photons and particles (CZ.02.1.01/0.0/0.0/16-019/0000789) from the European Regional Development Fund.