COMSOL 6.3 - Wavelength Domain

) study and study step are used to compute the response of a linear or linearized model subjected to electromagnetic harmonic excitation for one or several wavelengths.

For example, in electromagnetic wave propagation, it is used to compute a structure’s transmission and reflection versus wavelength. A Wavelength Domain study accounts for the effects of all eigenmodes that are properly resolved by the mesh and how they couple with the applied excitations. The output of a Wavelength Domain study step is typically displayed as a transfer function (for example, magnitude or phase of scattering parameters versus wavelength).

The Wavelength Domain study step also provides a frequency, defined as

where f is the frequency, c0 is the speed of light in vacuum, and λ is the vacuum wavelength. This frequency can be used as an input parameter to physics interfaces formulated to be run by Frequency Domain studies.

It is also possible to add an auxiliary sweep to this study step, which creates a multiparameter sweep (Parametric solver) over both the wavelength and the given parameters, and optionally with continuation in the wavelength or in one of the given parameters. It corresponds to a stationary parametric solver that is preset to linearize the equations (Stationary Solver with a Parametric attribute).

Alternatively, select the checkbox to use an AWE Solver instead of the Parametric solver.

	The Include geometric nonlinearity checkbox and the Results While Solving, Mesh Selection, Adaptation and Error Estimates, Geometric Entity Selection for Adaptation, and Auxiliary Sweep sections are described in Common Study Step Settings. There is also detailed information in the Physics and Variables Selection and Values of Dependent Variables sections.

This study and study step require the Wave Optics Module.

Specify the vacuum wavelengths to use for the wavelength sweep. Select the unit to use from the list (default: μm). Type the vacuum wavelength in the field using space-separated numbers or the range function.

Use the field to select a file with parameter values. You can browse your file system for files by clicking the button (

). You can also click the downward arrow beside the button and choose (

) to open the fullscreen window. Click the downward arrow for the menu (

) to choose (

) to move to the row for this file in the window, (

), and (if you have copied a file location) (

). After selecting a file, click the button (

) to load the parameter values into the field.

For information about the list, see Reuse Solution from Previous Step List.

From the list, choose (the default) to use the tolerance suggested by the physics. Choose to override the suggested relative tolerance with a value that you enter in the field.

Also see Auxiliary Sweep.

Select the checkbox to enable the asymptotic waveform evaluation (AWE) solver. The Frequency Domain study generates a solver configuration that is used to solve a stationary parametric problem or an asymptotic waveform evaluation problem. By selecting this checkbox, this study step corresponds to an AWE Solver.

If you are running a parametric sweep and want to distribute it by sending one parameter value to each compute node, select the checkbox. This requires that your study includes a parametric sweep. To enable this option, click the button (

) and select in the dialog.