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How do I make a laser on z-axis in 2D modeling?

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Hi,
I did 2D modeling in Electromagnetic waves, Transient mode.
I wanna make a model in which the enhanced electric field is shown when a laser passes from air to nanopattern.
however i don't know how to make a laser passing through nanopattern z-axis.

actually I am modeling plasmonic effect in gold nano bowtie, you know, and I read 'Second Harmonic Generation of a Gaussian Beam' in model library, but I didn't apply this sample into my model.
in shorts, i cannot change x-axis laser into z-axis laser....

question: 1. How do I make a laser on z-axis in 2D modeling?
2. How do I apply model depth on z-axis in 2D?

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