Investigation on third order nonlinear optical, electrical and surface properties of organic stilbazolium crystal of 4-N,N-dimethylamino-N′-methylstilbazolium p-methoxybenzenesulfonate

•Growth of organic stilbazolium derivative with potential NLO application reported.•DSMOS shows large two photon absorption coefficient with negative nonlinear index.•The electric, dielectric and photoconductivity studies were conducted.•Surface features were studied by AFM.

The third order nonlinear optical, electric and dielectric properties of an organic stilbazolium derivative of 4-N,N-dimethylamino-N′-methylstilbazolium p-methoxybenzenesulfonate (DSMOS) crystal are reported. The nonlinear refractive index (n2), two photon absorption coefficient (β) and third order optical susceptibility χ(3) have been measured by Z-scan technique using Gaussian beam from the Nd:YAG laser at 1064 nm. The results show a large negative nonlinear refractive index (n2 = −1.122 × 10−9 cm2/W) with a molecular two photon absorption coefficient β value of 3.625 × 10−6 cm/W. The low dielectric constant observed in the high frequency region indicates the suitability of the sample for electro-optic applications. The surface features are also investigated by atomic force microscopy (AFM).

Graphical abstractThe closed aperture Z-scan curve of DSMOS suggests that the pre-focal transmittance peak is followed by the post focal valley, which is the signature of negative nonlinearity.Figure optionsDownload full-size imageDownload high-quality image (29 K)Download as PowerPoint slide