July 28, 2023 at 2:53 pmSahaSubscriber
I need to check response of a dielectric film considering only third order nonlinearity. It seems there is two way to define it.
1)chi3/chi2 material --> only chi3 has nonzero value (e.g. 1e-19) and base material is defined seperately with a (n,k) material with n=4,k=0 (no loss);
2)kerr nonlinear --> permittivity =16, chi3= 1e-19.
As I ran the 2D sim with a plane wave source and sweeped the amplitude (E0), the T response was different. Here is a plot for a film thickness of 125nm.
Can anyone help me understand the difference in dynamics of these two material types? Thanks.
July 28, 2023 at 10:43 pmGuilin SunAnsys Employee
Those two models do not apply for the same material, as chi2/chi3 model needs non-zero chi2. If it is pure chi3, please use the chi3 material-Kerr model only. Example can be found here https://optics.ansys.com/hc/en-us/articles/360041718634-Kerr-effect-on-Gaussian-beam-propagation
July 29, 2023 at 1:30 amSahaSubscriber
Thanks for clarification.
The built in kerr nonlinear model seems to take input for only single permittivity value. Can this be applied for dispersive materials as well? If so, how?
July 31, 2023 at 3:00 pmGuilin SunAnsys Employee
It seems no. Please refer this page https://optics.ansys.com/hc/en-us/articles/360034394734-Advanced-and-custom-optical-material-models-in-FDTD-and-MODE
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