Hi, I would like to simulate an oblique incident plane wave with different frequencies on a periodic structure. According to a previous post ( https://www.mail-archive.com/meep-discuss@ab-initio.mit.edu/msg00691.html), I should conduct the simulation for each frequency separately and use a narrow-band source. My understanding is we can specify one periodic condition at a time and at a specific incident angle, only one frequency satisfies that condition.
If I choose to use narrow-band sources to simulate different frequencies, I'm wondering if there is a way to estimate how narrow it should be because the simulation becomes more expensive as I keep making it narrower. Does the width depend on the sampling frequency I want or something else? A second question is that I found it very expensive to rerun simulations for different incident angles and frequencies. And I was wondering if it is possible to run the different incident angle and wavelength combinations together, where each combination satisfies the periodic boundary condition. For example, if my periodic boundary condition is exp(2 * pi * i * k_z * z) then I change the frequency and incident direction together so that k*sin(theta) is always k_z, where theta is the angle between the incident direction and the x-y plane. Thank you! Mandy Xia
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