Study on Z-scan characteristics of multilayer nonlinear media using coordinate transformation method

We present a method that combines coordinate transformation and Crank–Nicholson finite difference scheme to simulate numerically Z-scan measurements of a multilayer nonlinear medium or a complicated multilayer structure. The method would be useful to design and optimize optical limiters and to determine the nonlinearities of cascading medium layers. The method has given a guideline for determining the characteristics of multilayer medium.