Nonlinear Absorption Features of Acid Blue 129 Dye in Polar Solvents: Role of Solvents on Solute Molecule

Abstract

This paper focuses the study of nonlinear absorption (NLA) features of anthraquinone dye namely, acid blue 129 with various polar solvents including ethanol, methanol, acetone, 1-proponal and DMSO. The acid blue 129 dye in polar solvents is characterized by UV-Visible absorption and emission study. The NLA measurements of acid blue 129 dye is examined via open aperture (OA) Z-scan method employing at 650 nm wavelength. The OA curve of the experimental dye exhibits both saturable absorption (SA) and reveres saturable absorption (RSA) characters, which results from negative and positive NLA coe cient (β). The order of ground and excited state absorption cross-section is measured to be 10 22 m 2 and 10 18 m 2 , respectively and proved the existence RSA in acid blue 129 dye. The order of NLA coe cient and imaginary component of the third-order nonlinear susceptibility of acid blue 129 dye in polar solvent is calculated to be 10 3 cm/W and 10 5 esu, respectively. The multi-parameter scale viz., Kamlet-Abboud-Taft is used to measure the in uence of solvent parameters on solute molecule. The results from the experiments suggest that the acid blue 129 is a suitable candidate for nonlinear optical (NLO) applications.