Periodic Condition
The Periodic Condition sets up a periodicity between the selected boundaries. The Destination Selection subnode is available from the context menu (right-click the parent node) or from the Physics toolbar, Attributes menu.
Boundary Selection
The software automatically identifies the boundaries as either source boundaries or destination boundaries This works fine for cases like opposing parallel boundaries. To control the destination, add a Destination Selection subnode. By default it contains the selection that COMSOL Multiphysics has identified.
Periodicity Settings
Select a Type of periodicity — Continuity (the default), Antiperiodicity, or Floquet periodicity. Select:
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Continuity to make the electric field periodic (equal on the source and destination),
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Antiperiodicity to make it antiperiodic, or
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Floquet periodicity (The Electromagnetic Waves, Frequency Domain Interface and The Electromagnetic Waves, Beam Envelopes Interface only) to use a Floquet periodicity (Bloch-Floquet periodicity).
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For Floquet periodicity also enter the source for the k-vector for Floquet periodicity.
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For User defined specify the components of the k-vector for Floquet periodicity kF (SI unit: rad/m).
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For From periodic port the k-vector for Floquet periodicity kF is obtained from the Periodic Port settings.
Constraint Settings
To display this section, click the Show More Options button () and select Advanced Physics Options in the Show More Options dialog box. For information about the Constraint Settings section, see Constraint Settings in the COMSOL Multiphysics Reference Manual.
Orientation of Source
For information about the Orientation of Source section, see Orientation of Source and Destination in the COMSOL Multiphysics Reference Manual.
Periodic Boundary Conditions
Fresnel Equations: Application Library path Wave_Optics_Module/Verification_Examples/fresnel_equations
Plasmonic Wire Grating: Application Library path Wave_Optics_Module/Gratings_and_Metamaterials/plasmonic_wire_grating