Abstract
Transient reflection spectroscopy and degenerate four wave mixing technique were employed to study the light-induced insulator-to-metal phase transition (PT) and ultrafast relaxation dynamics in VO<sub>2</sub>. Spectral reflectivity during light- and thermally-induced PT shows close proximity in the relative change. The relaxation dynamics is strongly dependent on the film morphology, laser pump energy and substrate material. After light-induced PT the recovery time demonstrates a near-exponential dependence on the pump power. The recovery owing to cooling is considerably faster for VO<sub>2</sub> films deposited on single-crystal Al<sub>2</sub>O<sub>3</sub> or MgO substrates compare to VO<sub>2</sub> on amorphous glass. The noticeable transient nonlinear optical response of metallic VO<sub>2</sub> was observed and interpreted in terms of electronic-polaron and hole-polaron clustering.
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