Nanosecond dynamics of a gallium mirror's light-induced reflectivity change

Details Nanosecond dynamics of a gallium mirror's light-induced reflectivity change Nanosecond dynamics of a gallium mirror's light-induced reflectivity change

2000-10-05

arxiv.org/abs/physics/0010017v1

Physics

Optics

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Scientific paper

10.1103/PhysRevB.63.165207

Transient pump-probe optical reflectivity measurements of the nano/microsecond dynamics of a fully reversible, light-induced, surface-assisted metallization of gallium interfaced with silica are reported. The metallization leads to a considerable increase in the interface's reflectivity when solid a-gallium is on the verge of melting. The reflectivity change was found to be a cumulative effect that grows with light intensity and pulse duration. The reflectivity relaxes back to that of alpha-gallium when the excitation is withdrawn in a time that increases critically at gallium's melting point. The effect is attributed to a non-thermal light-induced structural phase transition.

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