How do I set an AstigmaticGaussianBeam source?

Date	Category
2023-12-11 15:07:45	Sources

The tidy3d.AstigmaticGaussianBeam class implements the simple astigmatic Gaussian beam described in Kochkina et al., Applied Optics, vol. 52, issue 24, (2013). The simple astigmatic Guassian distribution allows both an elliptical intensity profile and different waist locations for the two principal axes of the ellipse. The following example illustrates how to set up a tidy3d.AstigmaticGaussianBeam.

# Source bandwidth.
pulse = tidy3d.GaussianPulse(freq0=200e12, fwidth=20e12)

# Source definition
gauss_source = tidy3d.AstigmaticGaussianBeam(
  center=(0, -5, 0),
  size=(0, 3, 3),
  source_time=pulse,
  direction='+',
  pol_angle=0,
  angle_theta=0,
  angle_phi=0,
  waist_sizes=(1.0, 2.0),
  waist_distances=(-1.0, -2.0),
  name="gauss_source",
)

Use the center and size parameters to set the source position and dimension, then adjust the source_time dependence using tidy3d.GaussianPulse. The direction parameter specifies propagation in the positive or negative direction of the injection axis. You can change the light polarization using pol_angle, and adjust the propagation axis direction with angle_theta and angle_phi to control the polar and azimuth angles. In this example, different waist_sizes and waist_distances were specified in the x- and y-directions.