Reply To: weird reflectivity / transmission plots

[Kirill]

Hello,

 

- The oscillatory behavior you’re observing might be due to thin-film interference, which is typical when working with a thin dielectric slab like titanium dioxide. Interference patterns naturally arise based on the slab thickness and the wavelength of light.

 

- Depending on the specifics of your simulation, you might want to consider using periodic boundary conditions in the transverse direction (Y, in your case). This should help reduce unwanted reflections at the edges by allowing the waves to wrap around seamlessly, instead of reflecting off the simulation boundaries. Check also: Periodic boundary conditions in FDTD and MODE

 

- Otherwise, consider experimenting with the PML settings. See more on this topic in the article: PML boundary conditions in FDTD and MODE

 

- Finally, you may want to consider using other solvers to verify your simulations, like STACK or RCWA, see reference: STACK Optical Solver Overview