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[joaonizer]

Hi,

I'm trying to observe total internal reflection in a slab interface, it is quite a simple structure, but I'm not sure why I'm not able to get the proper results.

I'm setting up an HFSS simulation where I include two slabs one glass (eps_r = 5.5) and another vacuum (eps_r=1). Then I surround the structure with Lattice Pair boundary conditions and specify a phase shift of 'theta0' (incidence angle), which is the variable I'm going to sweep. Then, at the bottom face, I set a Floquet port (FP1) that touches the glass slab and at the top, I have a second Floquet port (FP2) that touches the vacuum slab.

I make sure that the A and B dimensions of the unit cell are small enough so only the fundamental modes are propagating.

For TE and TM (m=0, n=0) I do get the correct results that match with Fresnel coefficients only for the case where the wave is incident from n1=1 to n2=sqrt(5.5) (n1

[Praneeth Munaga]

The answer to this question is being provided in this question - Total Internal Reflection - Dielectric Interface - Boundary Conditions ÔÇö Ansys Learning Forum.
I am closing this thread as this is duplicate to keep the sanity of the forum.
Kindly refrain from creating such duplicate posts in future.
All the very best.