Photo-induced fluidity in chalcogenide glasses: from visible to X-ray excitation

by Stefano Marchesin

Thursday 4 Jun 2026, 17:00 → 17:15 Europe/Rome

1/1-3 - Aula B (Dipartimento di Fisica e Astronomia - Edificio Marzolo)

Photo-induced fluidity is a phenomenon where a material's viscosity or structural rigidity decreases significantly upon exposure to light. Chalcogenide glasses are known to exhibit a variety of photoinduced phenomena included photofluidity. X-ray Photo Correlation Spectroscopy (XPCS) was used to probe X-ray induced fluidity for different Ge(x)-Se(1-x) glasses, these results were then compared with literature data obtained using sub-band-gap radiation. This comparison shows that photo-induced fluidity is mainly determined by the dose-rate deposited in the glass, enlightening the common nature of the effect over a broad range of energies (eV for visible light and KeV for X-ray). Residual effects not accounted for by the dose-rate can be explained in terms of a different efficiency of photo-induced effects across the energy gap of these glasses.