We propose a Z-scan theory for one-dimensional nonlinear photonic bandgap materials. The Z-scan characteristics for this material are analyzed. Results show that the Z-scan curves for photonic bandgap materials with nonlinear refraction are similar to those of uniform materials exhibiting both nonlinear refraction and nonlinear absorption simultaneously. Effects of nonlinear absorption on refle...

Abstract By employing the ultrafast Z-scan technique, we characterize nonlinear absorption property of PMMA/Bismuth Selenide ( Bi 2 Se 3 ) composite with varying concentrations. We report fabrication bismuth selenide nanoplate (topological insulator (TI)) doped poly methyl methacrylate (PMMA) thin film doping The effect on structural and linear properties PMMA has been investigated through UV-V...

A simple dual-wavelength (two-color) Z-scan geometry is demonstrated for measuring nonlinearities at frequency omega(p) owing to the presence of light at omega(e). This technique gives the nondegenerate two-photon absorption (2PA) coefficient beta(omega(p); omega(e)) and the nondegenerate nonlinear refractive index n(2)(omega(p); omega(e)), i.e., cross-phase modulation. We demonstrate this tech...

The Z-scan technique is a simple and effective tool for determining nonlinear optical properties of materials. This technique is utilized in measurement of urea and uric acid in blood. The nonlinear refractive index of urea and uric acid are found to vary linearly with concentration. Hence by calculating the nonlinear refractive index it is possible to measure their concentration in the sample....