How do I set a GaussianBeam?#
Date |
Category |
---|---|
2023-12-11 14:19:04 |
Sources |
The source tidy3d.GaussianBeam is a Guassian distribution on a finite extent plane. The example below illustrates how to define the tidy3d.GaussianBeam within a simulation.
# Source bandwidth.
pulse = tidy3d.GaussianPulse(freq0=200e12, fwidth=20e12)
# Source definition
gauss_source = tidy3d.GaussianBeam(
center=(0, -5, 0),
size=(0, 3, 3),
source_time=pulse,
direction='+',
pol_angle=0,
angle_theta=0,
angle_phi=0,
waist_radius=1.0,
waist_distance=-2.5,
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, the beamโs radius at the waist position was adjusted to 1\(\mu\)m using the waist_radius
parameter. When waist_distance
is positive (negative), the waist is behind (front) the source plane.
See this notebook to an example on setting up a tidy3d.GaussianBeam source.