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).

The 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 high-quality image (29 K)Download as PowerPoint slide