ldos-opt · Shaker et al. reproduction

SiN slot-gap LDOS live running

Dipole at (0,0) in a vacuum slot |x| < 0.5 λ₀ (0.5 μm of free space on each side if λ₀ = 1 μm). Design occupies 0.5 ≤ |x| ≤ 5 λ₀ and |y| ≤ 1 λ₀. Density is optimized in the first quadrant and mirrored through x = 0 and y = 0. Material ε ∈ [1, 4].

gap-sin · shifted β=∞ · updated

LDOS / vacuum

7.887e+03

best 7.887e+03 · target ≥ 500

1.492e+05

best 1.492e+05 · target ≥ 50,000

Iteration

1845

2690 factorizations

Re ω*/ω0

wall 1.197e+03 s

Length-scale P

0.4968

λ = 3 · erode/dilate

Shifted log-LDOS at Re ω*. Running until STOP file, SIGINT, or SIGTERM (touch /home/hoodlab/github/ldos-opt/results/runs/gap-sin/STOP). No LDOS/Q stop.

permittivity — ε(x,y), source as red/white dot. Red band is the frozen vacuum strip when present.

field — |E|² at the evaluation frequency

fragile band — Fragile band ρ_dilate − ρ_erode. Speckle lights up; a clean interface is a thin outline.

history — LDOS enhancement, Q, and length-scale penalty vs Maxwell-matrix factorizations