A newly synthesized organic chromophore (HCzN) showing optical linear and nonlinear response for potential in photonic applications

Abstract The present article demonstrates the optical linear and nonlinear studies of the chromophore 2,2'-(hexane-1,6-diylbis(9H-carbazole-9,3-diyl))bis(ethene-1,1,2-tricarbonitrile (HCzN). We have synthesized this molecule and the structure of this molecule has been confirmed via IR and NMR spectroscopies. The linear optical study has been done with the help of UV-Vis absorption and emission spectroscopies and we have measured the refractive index (n0), and optical bandgap (Eg) for this chromophore. We have explored the third-order nonlinear optical (NLO) characteristics of HCzN at the concentrations of 1, 2, 3, and 4 mM employing both closed and open-aperture Z-scan methods at 25 mW laser power. This chromophore evinces the self-defocusing and saturable absorption nature for closed and open aperture scans respectively. The calculated NLO parameters like the coefficient of nonlinear absorption (β) and refraction (n2) are found to be of the order of 10− 6 cm2/W and 10− 3 cm/W respectively with the nonlinear optical susceptibility (χ(3)), and hyperpolarizability (γ) of the order of 10− 5 esu, and 10–27 esu respectively. The magnitude of NLO parameters varies linearly with concentration.