Nonlinear optical properties of polyaniline doped with cardanol based dye

Abstract

We report the third-order nonlinear optical properties of polyaniline doped with an azo dye synthesized using cardanol. Cardanol, which is distilled from CSNL (Cashew Nut Shell Liquid), is a renewable resource since it is a byproduct of the Cashew nut industry. The linear absorption spectrum of the sample was determined in the wavelength range 100 – 800 nm. FTIR spectroscopic data of undoped and azo dye-doped polyaniline samples were compared. The morphology and structure of the azo dye-doped polyaniline are studied using SEM images and XRD. Nonlinear absorption studies were carried out using the single beam z scan technique. A Q-switched Nd: Yag laser operating at 532 nm wavelength with a pulse width of 7 ns was used as the source of light. The nonlinear absorption coefficient and nonlinear susceptibility were determined to be of the order of 10−11 m/W and 10−11 esu respectively. The results indicate that the material is a good candidate for optoelectronic applications.