Second-order hyperpolarizability and nonlinear optical properties of novel organic compound-doped poly (O-methoxyaniline) polymer film

摘要

The structural characterization of a new organic compound (3, 5-bis (4-chlor-ophenyl)-4,5-dihydro-1H-Pyrazole) was analyzed experimentally by ~1HNMR and FTIR spectroscopic technique. The analysis of HOMO-LUMO and natural bond orbital are investigated to study the charge transfer interactions leading to the properties of nonlinear behavior. Linear optical properties of a new organic compound/Poly (O-Methoxyaniline) (POMA) film were studied using Wemble and Didomenico (WD) technique to estimate the refractive index n and other optical constants such as the oscillation energy E_0, the dispersion energy E_d, and the lattice dielectric constant ε_∞. Measurements of the thermally induced optical nonlinearity of novel organic compound (3, 5-bis (4-chlorophenyl)-4, 5-dihydro-1H- Pyrazole) in an organic solvent (N-methyl-2-pyrrolidone) NMP)) were studied through an excitation source (continuous-wave diode laser at the wavelength of 473 nm) in the case of the solution and a conducting polymer film. The Z-scan technique was used to measure the nonlinear refractive index(n_2) to obtain the optical response of the prepared material. The prepared sample illustrated negative and large n_2 values in the order of 10~(-7) cm~2/W and reverse saturable absorption(RSA) with large values of the nonlinear absorption coefficient in the order of 10~(-3) cm/W. The nonlinear refractive index was determined and varied as a response to different concentrations. The determination of the figure of merit (W) and nonlinear coefficients indicate that the compound is a promising candidate for applications in the nonlinear optics field.