Source movies

This page provides a basic introduction to the sources in FDTD Solutions (with images of the steady state (CW) field profile and movies of the time domain pulse for each source). Sources in MODE Solutions’ propagator are very similar but may look slightly different since they do not have z-dependence.

Solvers

FDTD
VarFDTD

In this topic

Dipoles
Gaussian beam
Planewave
TFSF
MODE
Import

Associated files

usr_source_electric_dipole.fsp
usr_source_magnetic_dipole.fsp
usr_source_gaussian.fsp
usr_source_planewave.fsp
usr_source_TFSF.fsp
usr_source_mode.fsp
usr_custom_source.fsp

See also

Sources
Sources - Dipoles
Plane waves - Edge effects
TFSF sources
Making a CW Movie

Dipoles

Dipoles are used to simulate point source radiators, such as radiation from a fluorescent molecule. There are two types of dipole source: Electric (oscillating point charge) and Magnetic (current loop). The radiation pattern of these dipoles is similar, but not exactly the same. For more dipole source information, see the Sources - Dipoles page.

Image|Image|

Imagesource%20movie_xy_movie_electric_dipole

Imagesource-movie_xz_movie_magnetic_dipole

Gaussian beam

The gaussian beam source is typically used to simulate a focused beam incident on a structure. In this example we show a beam with a numerical aperture (NA) of 0.6 focused at a point 7$\mu m$ in front of the source injection plane.

image

Image source-movie_xz_movie_Gaussian

To reproduce the movies, run the associated simulation file. To create the CW field profiles, select the appropriate monitor to visualize the fields.

Plane wave

The plane wave source is typically used to simulate very large (approximately infinite) beams incident on periodic structures. Periodic or Bloch boundary conditions are normally required. In this example we show a plane wave traveling at a 30 degree angle of incidence in a 2D simulation. For more planewave source information, see the Plane waves - Edge effects page.

image
Planesource-movie_xz_movie_planewave

To reproduce the movies, run the associated simulation file. To create the CW field profiles, select the appropriate monitor to visualize the fields.

TFSF

The TFSF source is typically used to simulate very large (approximately infinite) beams incident on finite (non-periodic) structures. The scattering structure must be completely contained within the TFSF source. In this example we use a TFSF to see the scattering from a cylinder in a 2D simulation. For more TFSF source information, see the TFSF page.

image

TFSFsource-movie_xz_movie_TFSF

To reproduce the movies, run the associated simulation file. To create the CW field profiles, select the appropriate monitor to visualize the fields.

MODE

The MODE source is used to inject a guided mode into a device, such as a waveguide. In this example we use the Mode source to inject a 2nd order mode into a step index fiber in a 3D simulation.

image

MODEAPSUNYSCML

To reproduce the movies, run the associated simulation file. To create the CW field profiles, select the appropriate monitor to visualize the fields.

Import (custom) source

The Import source allows the user to import a custom source spatial field profile, which may be obtained from a monitor in another simulation, or calculated analytically.

Custom%20396x334 source-movie_xz_movie_custom

To reproduce the movies, run the associated simulation file. To create the CW field profiles, select the appropriate monitor to visualize the fields.

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