The software usually automatically identifies the boundaries as either source boundaries or destination boundaries, as indicated in the selection list. This works fine for cases like opposing parallel boundaries. In other cases, right-click Periodic Condition and select Manual Destination Selection to control the destination. By default it contains the selection that COMSOL Multiphysics identifies.
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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 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.
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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
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