Learning Forum

[m.hoormann]

When I want to set an anistropic (n,k) material the new material does not take the refractive index values, but has only the values of 1, 1, 1. Also, I get the error "The material property, Refractive Index was not set. The property value must be a string or a matrix."

I use the following python script to set the material:

n_GaN = [2.4869, 2.3, 2.4869]

material = "GaN"

mode.setmaterial(mode.addmaterial("(n,k) Material"), "name", material)

mode.setmaterial(material, "Anisotropy", 1)

mode.setmaterial(material, {"Refractive Index": n_GaN, "Imaginary Refractive Index": [0, 0, 0]})

 

Here, "mode" is defined as: 

mode = lumapi.MODE()

 

Do I have to define the values in anbother way?

[Taylor Robertson]

Hello Matthias,

You have defined the indices of GaN as a list, but the materials need to be defined as a arrays, or using a string for the predefined materials in material library. In python [,,] creates a list data type which you need to convert to np array.

Passing-Data-Python-API

This type conversion between python and lsf can get a little complicated. I would suggest keeping it as simple as possible.

mode.setmaterial(material, "Refractive Index", np.array(n_GaN))
mode.setmaterial(material, "Imaginary Refractive Index", np.array([0, 0, 0]))

[m.hoormann]

Hello Mr. Robertson,

thank you for the fast reply. Now it works. 

Best,

Matthias