10^10 difference in Loss with Multi-coefficient material model

- July 8, 2024 at 1:11 pm
  
  sicli21
  Subscriber
  
  I am simulating a structure, in that my wavugide is cladded with SiO2. I am using sampled 3D data for my material with only real imaginary axis and SiO2 from material database. If I enable multicoefficent model in Material Explorer, I get 0.03 dB/cm, while if I disable it, loss is around 3*10^-12 dB/cm. How can make sure that I have no losses as my data is only real.
- July 8, 2024 at 5:44 pm
  
  Guilin Sun
  Ansys Employee
  
  When the material loss is very small, it is dfficult to exactly eliminate the loss in FDTD material fitting, since the real and imaginary part must obey the kk relation. If it is much less dispersive for the real part, you can use a dielectric material with index in the object panel to set only one value to such material. This will ensure there is no loss from the material.