2026-04-18 15:05:35 -07:00
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# fdfd
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::: meanas.fdfd
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## Core operator layers
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::: meanas.fdfd.functional
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::: meanas.fdfd.operators
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::: meanas.fdfd.solvers
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::: meanas.fdfd.scpml
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::: meanas.fdfd.farfield
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2026-10-18 23:07:53 -07:00
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## SCPML conventions
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`stretch_with_scpml` now uses `-1` for the low-index face and `+1` for the
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high-index face, matching CPML and propagation conventions. It returns copied
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widths by default; pass `copy=False` to request mutation explicitly.
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Both SCPML builders accept `kappa_function(depth)` for real stretching and
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`max_imag_ratio` to limit the final dimensionless `abs(Im(s))/Re(s)`. Start a
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mode-solver convergence study with `max_imag_ratio=1.0`: overly strong imaginary
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stretching can produce above-light-line PML artifacts. The cap is not a general
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spectral guarantee, and weaker absorption can increase boundary reflections.
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Check domain size, PML thickness, strength, mode localization, and residuals.
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The general scattering profile remains uncapped by default.
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