Problem with discontinuities in reflection spectrum
I am interested in the reflection of a curved thin film with a real refractive index of 1.56.
I run a 2D simulation and use a TFSF source with a structure imported from an image. The source, simulation region and monitor are set up in the following manner:
I used PBC on the x-sides and PML with a steep angle profile on the y-direction (top and bottom). The mesh accuracy is 5.
The reflection spectrum obtained from the monitor above the source contains multiple peaks that looks like instabilities. What could be the source of these features?