set_lower_PML

set_lower_PML(p): gives the lower cladding of all subsequently defined Slabs an imaginary thickness of p*1j, with p usually negative for absorption. Implements PML boundary conditions. The lower cladding is at x=0, at the first term in the expression to create a Slab. By default, p is zero. Needs to be set BEFORE structures are defined.

See section set_upper_PML, set_circ_PML.

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