What is the difference between the scattering BC and PML?

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Scattering Boundary Condition (BC) and Perfectly Matched Layer (PML) are both used in COMSOL RF module for simulating optical interactions, but they serve different purposes. Scattering BC is typically applied to model open boundaries where waves can exit the simulation domain, while PML is designed to absorb outgoing waves more effectively, minimizing reflections. The application rules for these boundary conditions differ between far-field and near-field studies, with PML being more advantageous in far-field scenarios due to its superior absorption properties. In contrast, Scattering BC may be more suitable for near-field applications where wave interactions are significant. Understanding these differences is crucial for accurate modeling in optical simulations.
faryafada
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Hi,
I want to know what is the proper boundary condition in COMSOL RF module to study optical interactions, Scattering BC and PML? or what is the difference between them? also I want to know if the rules are different for application of these two BCs in far-field and near-fields studies?

Thanks,
Farya
 
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