How to Model Two-Photon Absorption (TPA) in COMSOL

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Hi, I am trying to model the two-photon absorption (TPA) process in a nanostructure using COMSOL Multiphysics. For describing light propagation, I am using the Wave Optics Module.

My main question is how many physics interfaces are required to properly model this process .

I would greatly appreciate any guidance on the choice of appropriate physics interfaces and the practical steps needed to implement two-photon absorption in COMSOL.

In addition, if anyone could point me to an example model or a COMSOL application that demonstrates two-photon absorption, or more generally multiphoton absorption, I would be very grateful.


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