How to add anisotropic dielectric permittivity for Lithium Niobate material in CHARGE

- May 18, 2022 at 10:22 am
  
  lastskybender
  Subscriber
  
  I need to get the voltage-phase change relation, so that's why I am using CHARGE and FDE to get the change of neff. Now, regarding this I have following doubts:
  1) Can I simulate Lithium Niobate like materials in CHARGE? I mean does it support anisotropic dielectric permittivity constant for Lithium Niobate?
  2) If yes, how do I define its material property? Do I need to give its relative dielectric permittivity in the direction of extraordinary axis(for xcut LNOI), where electric field is polarized and changing?
  3) In insulator property (of SiO2) there is an option of relative dielectric permittivity but again that's a function of frequency and temperature (https://link.springer.com/content/pdf/10.1007/s40145-015-0176-7.pdf) so how do I do that; at which frequency should I choose relative dielectric permittivity for?
  4) The thermal properties of all materials given in default database have same value, will it not affect the simulation?
- May 18, 2022 at 4:11 pm
  
  Guilin Sun
  Ansys Employee
  
  A1: Currently CHARGE does not support anisotropy material. Please file a feature request.
  A2: you could try to do two (no, ne) or three simulations (if it has different values for nxx,nyy and nzz) and check the results to see if the difference is large. (this is out of the forum scope but it is worth of trying, personally, and let me know your results)
  A3: CHARGE only uses DC permittivity since the charge transportation equations only deals with static fields: CHARGE solver introduction the fields are not frequency dependent. Other parameters can change with temperature, but not the DC permittivity by default. If the change is larger, you may try to use different DC permittivity values at different temperature (again this is out of the forum scope, but you can try and see the difference. I would expect such change will be minimal)
  A4: if you do not simulation coupled with HEAT, it assumes the temperature will NOT change for CHARGE. If the parameters change and affect the result with temperature, you can do co-simulation with HEAT.
- March 20, 2023 at 8:49 pm
  
  Guilin Sun
  Ansys Employee
  
  Please vote this feature https://ix.lumerical.com/ideas/LUM-I-77

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