Nonlinear Optical Characteristics of Thin Films Made from Mixed Organic Laser Dyes Doped with Metal Nanoparticles and PMMA Polymer

Abstract

This study examines the non-linear optical characteristics of thin films made of an organic laser dye combination of Malachite Green and Nile blue doped with PMMA polymer and Au, Ag, and Cu nanoparticles that have been dissolved in chloroform solvent. Samples of thin films made by drop-casting dye solutions at a concentration of 10^-3 M. the absorption spectra for all samples in the (430–700) nm region. The Z-scan method, which has two kinds of closed and open apertures, has been used to investigate the non-linear absorption coefficient (β) and non-linear refractive index (n₂). Each thin film sample has an aperture that is open, allowing for saturable absorption. The outcomes demonstrated that extremely significant nonlinear characteristics are present in all thin films. According to the findings, there was a linear rise in the nonlinear refractive index with the nonlinear phase shift. According to the results, every sample has the potential to be employed as an active laser medium and in a variety of optoelectronic applications.