Hello,
I have a question about defining background field in COMSOL, in my simulation which is slightly different from the scatterer on substrate solved model by COMSOL; I have to define the incident light as a x polarized light which propagates in the -z direction, can I use the E0*exp(-j*ewfd.k0*z) as my background field?
I tried to solve the problem with this definition but there was something wrong and I wonder if I am defining my background field wrong.
I appreciate your help.
Dear Katayoon Ghaemi , the background field would be the electric field in absence of the scatterer. So, basically you would have to model it removing your scatterer and assuming an infinite substrate in the z direction. This background field would be the sum of the incident, reflected and transmitted plane waves.
This is clearly explained at COMSOL blog by Walter Frei : Modeling the Scattering of Light Off of an Object on a Substrate:
https://www.comsol.es/blogs/modeling-the-scattering-of-light-off-of-an-object-on-a-substrate/
There he follows a method to get an analytic solution of the background field, that could be more time consuming at setting up the simulation, but runs faster than the scatterer on substrate you referred to. This analytical approach is clear and helps to reinforce the understanding of the method.
Hope it helps. Good luck with your simulation.
Dear Manuel Gómez thank you for your help. It helped me very much and my problem is solved now.
Dear Katayoon Ghaemi , glad to know you have been able to solve your problem, congrats! And my best wishes!
Regards,
Manuel
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