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Ansys Learning Forum › Forums › Discuss Simulation › Photonics › RCWA – extracting the phase of the reflected light › Reply To: RCWA – extracting the phase of the reflected light

October 22, 2024 at 6:33 pm
Guilin Sun
Ansys Employee

This is really a good question! In textbooks s and p polarization has a plane of incidence. In simulaiton it is 3D, it can be confusing to define which one is the incident plane. Usually I suggest to check, if you will have angled incidence, which plane it will be? usually it is in xz plane. thus you can take xz plane as the incident plane. 

However in normal incidence, it really does not matter since there is only two states of polarization. If the structure is not rotationarily symmetric, you can DEFINE which plane is the incident plane. But according to our definition, it is xz plane. Please refer to this article:

https://optics.ansys.com/hc/en-us/articles/360034394294-Understanding-direction-unit-vector-coordinates-in-far-field-projections

since we assume phi =zero when only the illumination has an angle.

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