Guilin Sun
Ansys Employee

There are two script files for this example:

Next time please specify which script file you are referring.

A1: I am not sure where we mentioned the mode amplitude. I think it is the E amplitude. E anfd H are the mode fields.

A2: m and n are the grating diffraction orders. They are result, not input parameters

Q3 " in RCWA, I am not sure how far for ekx_f... can we use the same method in FDTD to get this phase?"

and since this is analytical solution, the result is on the surface, similar to Fresnel coefficients.

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Amplitudes of E and H fields will be returned as ekx_f, eky_f, ekz_f, ekx_b, eky_b, and ekz_b

they are field amplitudes in k space for E and H.

Mode amplitudes will be returned as asx, asy, bsx, bsyapx, apy, bpx, and bpy

Here s and p are the polarization. a and b means E and H (I do not know why), and xy components only.

I do not know where "kx, ky" is from in which file?

index_sub = getfdtdindex("SiO2 (Glass) - Palik",excitation.f,min(excitation.f),max(excitation.f)); is to get the refractive index of the material (SiO2 in this case). 


pinch(pinch(Fields.E,5),5): please refer "pinch"


Please note that Fields.E is a 6 dimension matrix, x,y,z,f,radius and Ex/Ey/Ez in the 6th dimension.


dist = 0.151606*um; #Distance between source and first layer in FDTD model

should be from FDTD simulation file. But I believe the FDTD simulation file has been modified as this distance is no loner this value.

Earnestly, I really do not know why it uses those strange values. If I did this example, I would use some values to match the mesh, or some integer numbers.