Effect of Molar Concentration and Solvent Type on Linear and NLO Properties of Aurintricarboxylic (ATA) Organic Dye for Image Sensor and Optical Limiter Applications

Aurintricarboxylic (ATA) organic dye is a promising chemical compound candidate for several optical and electronic applications. However, this study aims to investigate the impact of molar concentrations and solvent type on the linear/nonlinear optical (NLO) properties of 5,5'-[(3-carboxy-4-oxocyclohexa-2,5-dien-1-ylidene) methylene] bis (2-hydroxybenzoic acid) organic laser dyes. Three molar concentrations of organic dyes (2x10(-3), 4x10(-3), and 6x10(-3)) M were respectively dissolved in distilled water and dimethylsulfoxide (DMSO) at room temperature. The samples were investigated using H-1-NMR and UV/Visible spectrums. The bandgap (Eg) of (2x10(-3) M) ATA/water is 4.75eV, but Eg of ATA/DMSO was 2.93eV and 2.65eV. The measurements were performed by employing a diode-pumped solid-state laser operating at a 457 nm wavelength and 112mW of power. The Z-scan technique was applied to characterize open and close apertures, nonlinear refractive index (n), and nonlinear absorption coefficient (beta). The obtained results predicted that both the n and beta coefficients decreased with the reduction of molar concentrations. Additionally, DMSO exhibited better linear/NLO properties than water. The results revealed promising laser dye samples for image sensor and optical limiter applications.