Measurement of nonlinear optical coefficients of zinc cobalt ferrite using the z-scan technique with variable intensity

In this study, cobalt zinc ferrite nanoparticles were synthesized with the formula Cox-1ZnxFe2O4 using a Co-precipitation method, varying x values. A green laser was utilized as the excitation source to measure the nonlinear refractive index and absorption coefficient at three different intensities. The z-scan method was employed for both closed and open apertures at room temperature. The findings indicate that as the initial laser intensity increases, the nonlinear refractive index and nonlinear absorption coefficient decrease. Additionally, an increase in concentration at a specific intensity results in a limited appearance of nonlinear properties. Furthermore, an increase in the linear absorption coefficient corresponds to an increase in these nonlinear coefficients. This nanostructure proves valuable for night sensing applications due to its negative refractive index under strong nonlinearity. In this context, the spinel model of the nanostructure holds promising potential for 6G communication applications.