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Ultrafast optical reflectivity measurements of silicon, germanium, and gallium arsenide have been carried out using an advanced set-up providing intense subpicosecond pulses (35 fs FWHM,= 400 nm) as a pump and broadband 340–780 nm ultrafast pulses as a white supercontinuum probe. Measurements have been performed for selected pump fluence conditions below the damage thresholds, that were carefully characterized. The obtained fluence damage thresholds are 30, 20.8, 9.6 mJ/ for Si, Ge and GaAs respectively. Ultrafast reflectivity patterns show clear differences in the Si, Ge, and GaAs trends both for the wavelength and time dependences. Important changes were observed near the wavelength regions corresponding to the, singularities in the joint density of states, so related to the peculiar band structure of the three systems. For Ge, ultrafast reflectivity spectra were also collected at low …
Nature Publishing Group
Publication date: 
15 Oct 2020

A Di Cicco, G Polzoni, R Gunnella, A Trapananti, M Minicucci, SJ Rezvani, D Catone, L Di Mario, JS Pelli Cresi, S Turchini, F Martelli

Biblio References: 
Volume: 10 Issue: 1 Pages: 1-9
Scientific Reports