I have quite a simple question: how can I set the direction of a continuous source in Meep?
To be more specific, for example, let's say I want a continuous source to interact with a Bragg grating at a 30 deg angle (2D). How do I do that?
How to set propagation direction of a source in Meep?
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It's perhaps more useful to think about what kind of source will generate a planewave incident at 30 degrees (which seems to be what you're interested in). If z is your direction of propagation, an infinite sheet of dipoles in the xy plane will do this.
Check out the user interface page here. For a 3D geometry I'd specify a source with 2D size (or a 1D line of dipoles if your simulation is in 2D), then create your structure rotated by the desired angle (rotate by specifying the block's e1, e2, e3 axis).