I am trying to learn the example below:
but i do not know how to change the absorption coefficient of the germanium material. As there is a sentence in the example: In the 3D optical simulation with FDTD Solutions, the absorption coefficient used for germanium was 5 times larger than typical values for bulk germanium. This accounts for the increase in absorption for high-temperature-growth Ge films compared to bulk Ge [Guoiliang2012].
I am wondering is there any way to change the absorption coefficient of the Ge? Does anyone know? I cannot find in the software.