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engines/quan_loncar_v1/package/quan_loncar_optimizer/engine/quan_loncar_series_phase45/README.md · assembled 2026-07-29 15:57 UTC.

Phase 45: first constrained Q optimization step

This phase turns the validated 45-coordinate Jacobian into a genuine geometry update. It maximizes the first-order total quality factor while projecting out first-order resonance-frequency motion. The physical step is limited by an L2 trust region and affine fabrication constraints:

  • 20 nm longitudinal silicon ligament between neighboring holes;
  • 50 nm transverse sidewall ligament;
  • 40 nm minimum longitudinal and transverse hole radii.

run_phase45_q_optimization.py obtains the baseline gradient from the validated Phase-41 checkpoint, proposes a conservative step, independently re-solves the corrected complex pole, and then evaluates the full unified Q/mode-volume/feed-coupling state at the accepted geometry.