Learning Forum

[teddie smith]

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.

[Guilin Sun]

 

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