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The synthesis of a new curcumin analogue dye via 3-chloro-2,4-pentanedion condensing with an aromatic aldehyde is considered. Following that, the synthesized compound is diagnosed utilizing spectroscopic methods, including FTIR, mass, 1H NMR, and 13CNMR. The curcumin analogue geometric optimization and theoretical studies are conducted on thermodynamic properties using DFT. The B3LYP techniques, which are hybrid functional with a 6–311+G(d) as the basis set, are adopted to compute the HOMO, LUMO, and Mullikan atom charges of the studied compound. The curcumin analogue dye nonlinear optical (NLO) properties are examined under excitation with a 473 nm, low power, cw and TEM00 mode laser beam. The index of nonlinear refraction (INLR) and coefficient of nonlinear absorption (CNLA) are estimated using diffraction patterns for the former and Z-scan for the latter. The INLR reaches a value as high as 6.86×10−11 m2/W, while the CNLA reaches 2.23×10−3 cm/W. All-optical switching (AOS) is tested in the novel curcumin analogue dye using two methods: static AOS and dynamic AOS.

The curcumin analogues (Cur-MeS and Cur-MeO) are synthesized using the 3-chloroacetyl acetone and aromatic aldehydes reaction. Both compounds are characterized using FTIR, LC-MS, H-1 NMR, and C-13 NMR spectroscopies. The geometric optimization and thermodynamic properties of the two compounds are carried out theoretically using DFT. The highest HOMO, lowest LUMO, and Mullikan atom charges of the two compounds are calculated using the B3LYP and CAM-B3LYP methods which are hybrid functionals with a 6-311+G(2d,p) as the basis set. The nonlinear optical (NLO) properties of both compounds are studied using the spatial self-phase modulation (SSPM) through the diffraction ring patterns (DRPs) and the Z-scan techniques, using a continuous wave (cw) low power 473 nm laser beam. The index of nonlinear refraction (INR) of both compounds is calculated by the two techniques. The all-optical switching property of both samples is tested using two visible cw laser beams.