Reflection index

- June 6, 2023 at 4:37 am
  
  teddie smith
  Subscriber
  
  As far as I know, there is a parameter called 'reflection index' that relates to the reflection and transmission of a material surface. I wonder what this value is set to in FDTD.
- June 8, 2023 at 5:30 pm
  
  Guilin Sun
  Ansys Employee
  
  Do you mean how to set the material property the refractive index in FDTD?
  If so, there are mainly two methods to assign the refractive index:
  1: if it is a fixed value, or diagonal anisotropic, you can directly assign it:
  2: use the material database. For example, Silicon:
  
  Please refer to
  https://optics.ansys.com/hc/en-us/articles/360044941894-Material-Properties-Introduction
  https://optics.ansys.com/hc/en-us/articles/360034901473-Rectangle-Simulation-Object
  
  If you want to calculate the refractive index from reflectance and transmitance you can by whatever the software/script you have at hand. Lumerical software only needs the refractive index or permittivity for simulation. You can import it https://optics.ansys.com/hc/en-us/articles/360034915093-Creating-new-sampled-data-materials-in-FDTD