set_upper_PML

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

See section set_lower_PML, set_circ_PML.

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