Abstract

Perovskite oxide vanadium-doped ${{\rm SrSnO}_3}$ (${{\rm SrSn}_{1 - x}}{{\rm V}_x}{{\rm O}_3}$) thin films with different concentrations $x = {0.1}{\sim}{0.9}$ were fabricated by using pulsed-laser deposition, and the effects of ${\rm V}$ doping on the structure, optical band gap, and the third-order optical nonlinearity were systematically investigated. With the increase of the $x$ value, the lattice parameters of ${{\rm SrSn}_{1 - x}}{{\rm V}_x}{{\rm O}_3}$ decrease from 3.997 to $3.862\;$Å gradually, while the optical band gaps first increase and then decrease with a boundary at $x = {0.3}$. The third-order nonlinear optical responses were studied via the ${\rm z}$-scan technique. The closed-aperture measurements show a negative nonlinear refractive index ${n_2}$, and the open-aperture measurements demonstrate a saturable absorption $\beta$. Both the ${n_2}$ and $\beta$ responses vary with the increase of ${\rm V}$ doping level. The metal-oxygen chemical bond and the localized ${{\rm V}^{5 +}}{{\rm Sn}^{2 +}}{{\rm V}^{5 +}}$ complex contribute to the enhancement of optical nonlinearity, and the highest value of third-order susceptibility ${\chi ^{(3)}}$ is observed in ${{\rm SrSn}_{0.5}}{{\rm V}_{0.5}}{{\rm O}_3}$ film.

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