ldos-opt · Shaker et al. reproduction

sin-per40 Δη=0.2 λ=3.0 a=0.4 finished

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| ≤ 2 λ0 and |y| ≤ 1 λ0. Density is optimized in the first quadrant and mirrored through x = 0 and y = 0. Material ε ∈ [1, 4].

sin-per40 · shifted β=∞ · updated

LDOS / vacuum
0.7746
best 0.782 · target ≥ 500
Q
12.94
best 18.54 · target ≥ 50,000
Iteration
590
940 factorizations
Re ω*/ω0
1
wall 135.5 s
Length-scale P
0.4672
λ = 3 · erode/dilate

Verified rebuild: LDOS/vac=0.775, Q_eig=12.9, P=0.467, fabricable=False. Gap |ε−1|≤0.00e+00, sym x/y 4.00e-15/2.66e-15.

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