Run

Structure

Preset

Background material

Background index (n₀)

Structure material

Structure index (n)

Structure κ (imag. index; + loss)

Background κ (imag. index; + loss)

Structure width

Structure height

Structure center X

Structure center Y

Anisotropic indices (optional)

n (x-axis)

n (y-axis)

n (z-axis)

0 = isotropic (use Structure n). TE uses n_x/n_y; TM uses n_z.

Kerr nonlinearity (optional)

Enable Kerr χ³

χ³ coefficient

D = εE + χ³|E|²E. Keep χ³ small (≪1) for stability.

Lattice pitch a

Hole radius r

Grating period Λ

Index modulation Δn

Geometry shapes

Free-form rectangles / circles / polygons overlay the base structure (µm, center-relative).

Enable subpixel (conformal)

Area-weighted ε at edges (cuts staircasing). CPU-only; ignored for dispersive materials.

Import geometry (GDSII / JSON)

Coordinates as "x1,y1 x2,y2 …" (µm). GDSII: load a .gds file (binary).

Layer stack

Horizontal slabs from the top down (planar-photonics geometry). Last layer fills the window.

Import stack (JSON)

Source

Polarization

Source type

Source profile

Wavelength λ

Pulse width (cycles)

Source X

Source Y

Incidence angle θ (deg)

Total-Field / Scattered-Field

Enable TF/SF plane wave

Background index n_bg

CW ramp (cycles)

Auto centered box

Box x₀ (µm)

Box x₁ (µm)

Box y₀ (µm)

Box y₁ (µm)

Injects an analytic plane wave on a rectangular total-field box (uses the Source type & Incidence angle above). Box interior = total field; exterior = scattered only. The soft source is disabled while TF/SF is on. Runs on GPU or CPU.

Dispersive material

Core model

ε∞ (high-freq)

Poles w0,g,wp (1/µm, one per line)

Monitors

Power-flux monitor (T/R)

Quantitative T/R (÷ P_inc)

2-port S-parameters

Broadband sweep T/R(λ)

Mode coupling efficiency η

Coupling spectrum η(λ)

DFT monitor λ (µm, 0 = off)

Simulation

Window width

Window height

Grid Nx

Grid Ny

Time steps

Absorbing boundary (PML)

PML thickness

PML strength

Boundary condition

Symmetry — top edge

Symmetry — bottom edge

Symmetry — left edge

Symmetry — right edge

Energy autoshutoff

Shutoff fraction (× peak)

View

Colormap Contrast

Show index profile

Field

Analysis

Near-to-far field

max

t = 0.0

0 Step 0 Peak |E|² 0 Total energy CPU

Spectrum (transmission)

Observation points

Power flux (T/R)

Radiation pattern

Angular far-field (normalized)

S-parameters (2-port)

Broadband spectrum T/R(λ)

Coupling spectrum η(λ)

Photonic band structure ω(k)

Spectral map along Γ→X→M (bright ridges = bands)

Mode expansion (output port)

Power coupled into each guided mode TE0, TE1, …

Steady-state field (DFT)

Field cross-section (DFT)

Cut position (%)

Resonance spectrum (probe FFT)

Peak frequency f₀ and quality factor Q from an E-probe ring-down (FFT).