Product engine
Self-contained project under engines/atom_fishbone_coupler/ (package · campaigns · runs · notes). Assembled 2026-07-29 15:57 UTC.
Atom Fishbone Coupler¶
Working name. New engine from scratch—not forked from Design23 or Quan–Lončar.
The active project is an air-clad SiO₂ fishbone cavity with a continuous 0.5–1.0 µm central air corridor. The corridor is intended to let an optical tweezer carry an atom from the exterior to the cavity-field maximum without crossing a dielectric surface. This is currently a design hypothesis, not a validated cavity or tweezer-scattering result.
The latest N40 diagnostic finds Q≈2,283 and passes its Auto-14 exact-pole energy/flux and time-window checks. However, its atom-oriented mode volume is 45.65 µm³ (95.73 λair³), 11.53 times the dielectric-centered peak volume. The present 1 µm-slot geometry is therefore a weak-atom-overlap baseline, not the finished design. Mesh/domain convergence and finite-waist tweezer scattering remain open.
The earlier Si₃N₄ unit-cell and plain-slot studies are retained as historical
baselines. The active research record, evidence gates, visual deliverables, and
25 FlexCredit ledger are in
notes/2026-07-28_atom_accessible_cavity_campaign.md (also available from the
generated site's Notes navigation).
| Path | Contents |
|---|---|
package/ |
Geometry + MPB/Meep drivers (built as we go) |
schematics/ |
Geometry definitions and schematic generators |
figures/ |
Plots, mode fields, geometry renders |
notes/ |
Lab notes (every geometry / plot / sim decision) |
campaigns/ |
Named study recipes (later) |
runs/ |
MPB/FDTD execution artifacts and the 25 FC ledger |
Coordinates (lab convention)¶
| Axis | Meaning |
|---|---|
| x | Propagation / Bragg period (periodicity a) |
| y | In-plane transverse (slot + fishbone amplitude) |
| z | Out-of-plane (film thickness) |
Project notes¶
- Active campaign:
notes/2026-07-28_atom_accessible_cavity_campaign.md - Historical geometry and exploratory solver log:
notes/2026-07-27_unit_cell_geometry.md - Historical topology schematic:
figures/unit_cell_schematic.png