Mirror-count doubling ablation

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Mirror-count doubling ablation#

COMPLETE · paired 7 ps FDTD · completed 2026-08-21T14:29:48+00:00

This is a controlled test of whether the selected curved cavity was limited by finite Bragg-mirror length. The original 8 fronts per side are preserved exactly; 8 additional fronts at the terminal period, duty, curvature, and aperture extend each mirror to 16. No defect, inner mirror, slab, material, grid, source, y extent, or fitting rule changes between the two solves.

Metric

control

doubled mirror

ratio

fitted Q

21.068

23.67

1.123×

atom-frequency LDOS

0.020774

0.023863

1.149×

near-atom peak LDOS

0.020896

0.025049

1.199×

total guided β

8.197%

2.405%

0.293×

guided Purcell

0.0017028

0.0005738

0.337×

fractional detuning

0.551%

0.073%

0.132×

Interpretation: Yes: the added terminal mirrors raise fitted Q by 12.3% and atom-frequency LDOS by 14.9%. They are not a complete device improvement, because guided beta changes by -70.7%.

The matched physical interior is 16.80 × 5.70 × 3.40 µm. The y extent remains exactly 5.70 µm. The x extent is enlarged only if needed to keep the longer mirror and terminal guide away from the x-PML; both control and extended devices are replayed in that identical box.

Literal control and doubled-mirror geometries

Matched LDOS spectra and atom-frequency Ez fields

Integrity checks#

  • original fronts preserved exactly: True;

  • y extent unchanged: True;

  • source control reused in an identical domain: False;

  • single-etch 2-D extrusion and hard 1 µm all-air gap retained;

  • grid spacing: 25 nm;

  • LDOS / outer-radiation frequency counts: 237 / 25;

  • symmetry: (1, 1, -1);

  • source winner: final_audit_5d2d8b7899.

Machine-readable paired result

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