What is the formula for PlaneWave?

Date	Category
2025-09-05 17:29:25	Sources

The PlaneWave source has the following scalar field amplitude:

$u(z)=e^{ik_z z}$
where $z$ is the propagation direction and $k_0=\frac{2\pi nf}{c}$ are the wavenumbers of the frequencies $f$ where the beam is sampled. If the source is specified as a fixed angle source, $k_0$ is multiplied by $\cos\theta$.

See the code here.