How to add and use compound refractive index materials?

[HGL2023]

Hello!
I added photoresist polymer named SU8, which has chemical formula C65.715 O13.934 F18.82 S0.957 H0.574 and refractive index is complex refractive index ((1-δ)-i*β; δ is refractive index; β is absorptive index), and I add the material information in the materials_compounds.py file (fig. 1), but the use of the method seems to be wrong all the time (fig. 2).
I hope you can point out my mistake, thank you very much!
Your advice is very important to me, thanks again!

[kklmn]

Hi,

I guess you haven't read the docs of Material class, have you? Otherwise, you wouldn't assign a string representation of a complex value to refractiveIndex.

Are you sure you want to override the default material's refractive index? What is your target energy?

Inserting your code directly into an external library is very uncommon. How would you upgrade the library to new versions? Your insertions would get lost.

[HGL2023]

Thanks for your tips!

You are talking about this part of the diagram, right? Honestly, I saw this but I really don't know how to correctly represent this 3-column numpy array. My energy is set to 15 keV with δ in the real part and β in the imaginary part. Thanks for your guidance! I really don't get it. Thanks!

I'll keep track of the modification method so that if there's a new version, I can download it and make the changes again. I really want to implement the kinoform OVAL lens simulation using XRT!

[kklmn]

15 keV is in the range of all three tabulations of scattering factors, so you don't need to define refractiveIndex. If you want to check the calculated refractive index, use the method get_refractive_index() of the created Material object.

[HGL2023]

I referenced ([Henke] http://henke.lbl.gov/optical_constants/asf.html B.L. Henke, E.M. Gullikson, and J.C. Davis, X-ray interactions. Photoabsorption, scattering, transmission, and reflection at E=50-30000 eV, Z=1-92, Atomic Data and Nuclear Data Tables 54 (no.2) (1993) 181-342).

This software calculates for SU8 at an energy of 15 keV:
delta (δ) = 2.124207e-6
beta (β) = 2.379735e-9
The refractive index is given by: n=(1−δ)−iβ.

According to the tutorial, it should be represented as a 3-column array. However, I'm unsure how to correctly represent this 3-column array in the script.

I'm really sorry to keep bothering you with these basic questions.

[HGL2023]

Hello!
Is this a correct representation of the material’s refractive index and absorption coefficient?

[kklmn]

Hi,
The xrt's module materials_compounds doesn't have the class 'SU8'. You can create your material based on the generic class Material from materials.
The use of the two methods is correct.

[HGL2023]

thanks!

[HGL2023]

These three images show the X-Z, X-Y, and Y-Z views of the same lens, with the Y-axis as the optical axis. Why is there no light on the Y-axis in the images, yet adding a screen behind the lens captures the light spot from the lens? What generally causes this situation?

[kklmn]

I guess, you set the y-limits wrongly. Your rays are outside of the -3..3 range.