im trying to simulate a 1D multilayer system such as a Bragg mirror.
in order to get efficient simulations i chose 2D simulation and reduced it to a single mesh cell in one of the simulation dimensions so that i get effectively a 1D simulation. The boundary condition for the dimension in which i have a single mesh cell are of course periodic.
Unfortunately i noticed that im getting a non-negligible reflection (around 5-10%) from the edge of the simulation.
I tried using all possible types of PML settings including stabilized and angle, and even greatly increased the number of PML layers to ~500, but nothing solves the reflection problem.
This reflection strongly affects the simulation results and makes them completely unreliable.
Is there anything i can do to fix this problem?