Dear Sreve Dods

Perfect information. Thanks in advance.

Would you please tell me how can I apply the eigen function from “starting field” in “file section”(I don’t want to use modal or gussion or rectangular for starting field)! Also where Can I put arbitarity refractive index as well.

Finally as I said about my research I still didn’t get your point about choosing right cladding and substrate size .Would you please check attachment and support me! Imaging I have a box (40mm*20 mm*30 microns)with refractive index of 1.42. Inside of this box there is mach-zehnder waveguide with refractive index of 1.43 in depth of 18microns from top.both materials are PDMS with different refractive index(1.42 for box and 1.43 for waveguide. In other words I cant understand cladding and substrate for this work and profile channel as well!
I still not sure about my simulation is correct or not. I did below steps:(wave guide size is 40mm for lenght and 20mm for width and 30microns for thickness. please check attachment to see size and gap between 2 arms are 300microns)
1.In profile designer I created 2 dielectric materials(cladding and guide with refractive index 1.42 and 1.43 respectively) for 2D and 3D isotropic. Then I made a profile channel and chosen guide for 2D profile definition and for 3D profile definition I made 1 layer that name are guide(thickness 8microns width 8 micons).
2. I designed Wafer properties as below:
A. Wafer dimension:length 40000 microns, width:350 microns.
B. 2D wafer properties: wafer refractive index section I chosen cladding.
C. 3D wafer properties: In sections of cladding and substrate material I chosen “cladding” with thickness 15 and 15 respectively( please tell me to fix this section correctly.

Your Sincerely,