Terahertz and optical ultrafast electron dynamics in platinum and gold

Vivek Unikandanunni; Stefano Bonetti

doi:10.1117/12.2594551

1 August 2021 Terahertz and optical ultrafast electron dynamics in platinum and gold

Proceedings Volume 11825, Ultrafast Nonlinear Imaging and Spectroscopy IX; 1182509 (2021) https://doi.org/10.1117/12.2594551
Event: SPIE Optical Engineering + Applications, 2021, San Diego, California, United States

Abstract

We investigate the terahertz and optical driven ultrafast dynamics in platinum and gold thin films by pump-probe reflectivity measurements with an optical probe. Platinum shows similar reflectivity change for both pump excitations, whereas gold shows a negligible reflectivity change for the terahertz pump. By employing a two-temperature model, we can explain the dynamics in platinum and determine electron-phonon coupling constant for the two pump excitations. We estimate a 20% larger electron-phonon coupling for terahertz-driven dynamics compared to the optical one, which we attribute to a concomitant nonthermal regime for both phonons and electrons. In the case of gold, we explain the negligible response as a terahertz-driven field emission of electrons via Fowler-Nordheim tunneling.

Conference Presentation

Citation Download Citation

Vivek Unikandanunni and Stefano Bonetti "Terahertz and optical ultrafast electron dynamics in platinum and gold", Proc. SPIE 11825, Ultrafast Nonlinear Imaging and Spectroscopy IX, 1182509 (1 August 2021); https://doi.org/10.1117/12.2594551

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