Out-of-plane longitudinal sound velocity in SnS₂ determined via broadband time-domain Brillouin scattering

Here, we report time-resolved broadband transient reflectivity measurements performed in a single crystal of SnS2. We made use time-domain Brillouin scattering and probe to measure the out-of-plane longitudinal sound velocity, υL=(2950±100)ms–1, this semiconducting two-dimensional metal dichalcogenide. Our study illustrates potential non-invasive all-optical pump–probe technique for elastic properties transparent brittle materials provides value constant c33=(39±3)GPa.