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[docs] clarify FDFD-to-FDTD field reconstruction

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Forgejo Actions 2026-04-19 16:15:06 -07:00
commit 40efe7a450
5 changed files with 51 additions and 5 deletions
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11
examples/waveguide_real.py
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@ -9,9 +9,12 @@ FDFD" workflow:
3. solve the matching FDFD problem from the analytic source phasor, and
4. compare late real monitor slices against `fdtd.reconstruct_real_e/h(...)`.
Unlike the complex-source examples, this script does not use phasor extraction
as the main output. The comparison target is the real field itself, with both
full-plane and mode-weighted monitor errors reported.
Unlike the phasor-based examples, this script does not use extracted phasors as
the main output. It is a stricter diagnostic: the comparison target is the raw
real field itself, with full-plane, mode-weighted, guided-mode, and orthogonal-
residual errors reported. Strong phasor agreement can coexist with visibly
larger raw-snapshot error because the latter includes weak nonguided tails on
the monitor plane.
"""
import numpy
@ -104,7 +107,7 @@ def main() -> None:
epsilon=epsilon,
)
# A small global phase aligns the real-valued source with the late-cycle
# monitor comparison. The underlying phasor problem is unchanged.
# raw-snapshot diagnostic. The underlying phasor problem is unchanged.
j_mode *= numpy.exp(1j * SOURCE_PHASE)
monitor_mode = waveguide_3d.solve_mode(
0,