I’m trying to design metalens, and I have a question.
I referred to this example, “https://apps.lumerical.com/metamaterials_metalens-design-example.html”
In S-parameter analysis, the plane wave source is launched behind the reflection monitor: the source is located behind the reflection monitor. Typically, a reflection monitor is located behind a source because of ignoring the effect of the incident source. Is there a reason the reflection monitor is placed after the source position? I think it is more difficult to analyze the result.