# 780 nm centered-atom driven proposal (2.5D)

- Status: **driven_proposal_checkpointed**
- Scientific acceptance: **false — nonlinear mode validation pending**
- Geometry grid: **76 × 40**, with **16 cells** across the 780 nm gap
- Density spacing x/y: **48.75 / 40.56 nm**
- Solve basis: **±10, ±4, 9 vertical nodes**
- Initial/proposal atom response: **0.0281575006 / 0.0282750809**
- Response factor: **1.00417581**
- Direct complex-field overlap: **0.99998168**
- Driven inner/gap energy: **0.799231 / 0.571795**
- Maximum density in protected air: **0.000e+00**
- Reflection error: **1.110e-15**
- Direct failed gates: **none**
- Runtime / peak RSS: **302.0 s / 0.214 GiB**

The optimizer directly improves the imaginary Green response seen by a centered
emitter at exactly 780 nm.  This checkpoint is deliberately called a driven
proposal rather than an accepted 2.5D candidate because the required nonlinear
pole reacquisition did not finish within the operational cutoff.  Exact air and
x/y reflection invariants are enforced in the saved density.