Inputs
Use consistent units; validate ranges.
v1.0
Model notes: effective indices are computed for s-polarization using n_eff = sqrt(n² − (n_a·sinθ)²) with ambient n_a=1.
HR bandwidth (S1)
—
HR bandwidth (S2)
—
n₁,eff / n₂,eff
—
OD at λ₀ (max shown)
—
Spectra settings
AOI: –° | ns: –
Export tips: Use Export CSV to copy the layer stack into spreadsheets / coating tools.
Design results
Charts
Spectra
Layer stack
About
Structure thickness bars are in nm;
OD curve uses OD = −log10(1−R₀) at λ₀.
OD curve uses OD = −log10(1−R₀) at λ₀.
Click Compute (top right) to generate the notch design and spectra.
S1 structure
p-modulated quarter-wave
High Index Layer (H)
Low Index Layer (L)
S2 structure
extended low-index thickness
High Index Layer (H)
Low Index Layer (L)
OD vs number of layers
evaluated at λ₀
Reflectance (R)
%
Transmittance (T)
%
Absorbance (A)
%
R, T, A
combined
Layer order is from ambient side to substrate side (1…2m).
| # | Type | n_eff | t_S1 (nm) | t_S2 (nm) |
|---|---|---|---|---|
| Compute to generate the layer stack. | ||||
Notes: This tool gives a quick analytic estimate of HR-zone width and OD at λ₀ for quasi-notch structures in s-polarization.
What this tool does
It calculates:
- Effective indices for s-polarization at the given incidence angle.
- Layer thickness sequences for two quasi-notch structures (S1, S2).
- OD at λ₀ as a function of layer count.
- HR-zone bandwidth estimates (Δλ) for S1 and S2.
Engineering note: This is not a full transfer-matrix spectral simulation. For production-grade design, you should verify with a full optical model (TMM) using dispersive n,k and real substrate stacks.
ASTRACOAT Notch Filter Design — UI rebuild for clarity and reliability (no collapsibles, stable charts, exports).