Hi,

I am a new player in Meep. Recently I try to simulate the transmission of
silicon nitride directional coupler. The waveguide core material I use is
silicon nitride. The waveguide cladding material is silicon dioxide. I have
checked the directional coupler example(
https://meep.readthedocs.io/en/latest/Python_Tutorials/GDSII_Import/#s-parameters-of-a-directional-coupler).
I think the background refractive index is air(n=1) in that example. I am
wondering if it is possible to set the background refractive index as the
refractive index of silicon dioxide. Thanks in advance.

Regards,
Siwei
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