Reply To: Question About Simulating Saturable Absorption (Setting imaginary part of Chi3)

[Dimitris Polyzos]

Hello, 

You are correct, the imaginary part of the existing models is not included. However, there is a workaround in order to include the absorption characteristic of a material. An option would be to create your own material model (check link #2). I have to let you know that it is quite an advanced feature that requires a very good understanding of the FDTD method as well as experience in C++ programming, meaning that it will require recompiling the C++ code, and changing the update equations. Please refer to the following links:
1. https://optics.ansys.com/hc/en-us/articles/360034394734-Advanced-and-custom-optical-material-models-in-FDTD-and-MODE.

2. https://optics.ansys.com/hc/en-us/articles/360034915213-Flexible-Material-Plugin-Framework?source=search

I hope I helped. 

Kind regards

Dimitris