Source

Engine design23_v1 · package package/design23_recentered_optimizer · assembled 2026-07-29 15:57 UTC.

Changelog¶

1.4.0¶

Replaced the fixed Design23 frequency center and derivative with self-consistent Newton recentering at every geometry.
Added 412-node screening and mandatory 812-node acceptance.
Added scaled, safeguarded full BFGS over all 126 hole coordinates.
Added atomic restart state and per-attempt physical diagnostics.
Added an immutable best-FDTD ledger and correct rollback semantics.
Added uniquely named FDTD checkpoints and a one-command pending-checkpoint wrapper.
Disabled the invalidated run_autonomous.py entry point.
Seeded the run from the FDTD-verified +0.5 nm geometry (Q 20,942.06).

integrates the pole/branch-subtracted absolute-Q solver as a production pure-Q objective over the 126 hole gap/radius coordinates;
adds an exact reverse-mode contraction of the smooth continuum and every explicitly restored strip-pole residue;
validates the repaired gradient against a 0.1 nm central difference with 6.7e-6 relative Q-gradient error;
adds a guarded max-coordinate line search and rejects candidates below the 0.999 branch-overlap gate;
produces a converged, symmetric Tidy3D validation panel at -0.5, -0.25, 0, +0.25, and +0.5 nm along the repaired gradient;
adds a resumable Tidy3D panel runner with preflight, estimate, submit, and cached-data analysis modes; and
expands the offline suite from 18 to 21 passing tests.

replaces the unstable two-dimensional deformed contour with explicit planar-film, light-line, and all-strip-pole extraction;
restores closed strip poles through ordered real-space propagation and integrates only a bounded reciprocal real-axis remainder;
obtains a converged Design23 iteration-0 pole with Q=7270.74 and wavelength=796.288 nm, versus FDTD Q=6176.55 and 796.664 nm;
reproduces the flat iteration-0/15/30 FDTD trend and rejects the legacy 3.6x analytical Q rise;
adds a central finite-difference gate for the saved rejected optimizer direction with branch overlaps above 0.999999;
adds panel-width and beta-cutoff convergence gates; and
expands the offline suite from 14 to 18 passing tests.

adds a reciprocal, positive-semidefinite physical radiation operator in the complete Design23 hole basis;
verifies matrix contractions against the converged scalar channel gate;
adds complex-qy continuation and a two-dimensional Sommerfeld-contour QNM prototype;
rejects both a local anti-Hermitian self-energy graft and a brute-force two-contour absolute-Q solve after explicit convergence gates fail;
identifies exponential long-cavity contour amplification and unresolved longitudinal singularities as the next production blocker;
documents the required pole/branch subtraction and stable real-space assembly path; and
expands the offline suite from 12 to 14 passing tests.

reconstructs the exact 84-hole Design 23 seed from the supplied notebook;
confirms the passive cavity branch by P0-to-P1 eigenvector continuation;
optimizes 42 spacings, 42 longitudinal radii, 42 transverse radii, SiN width, and SiN thickness with fixed anthracene and PVA;
changes the objective to pure Q while retaining V and TE0 as diagnostics;
adds fixed-pole width/thickness derivatives;
runs one FDTD checkpoint after every five analytical iterations;
rolls back an analytically positive/FDTD-negative five-step block;
adds resonance-demodulated x-y, x-z, and y-z cavity-mode plots;
adds true feed-port TE0 mode decomposition;
adds starting-versus-current geometry evolution plots;
preserves crash-safe state, active cloud task ids, cost accounting, and the non-GUI Matplotlib backend.