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Bulk Propagators

Beam Propagation Method for inhomogeneous media.

Overview

The Bulk Propagators module provides:

  • Beam Propagation Method with Angular Spectrum
  • Split-step propagation through varying refractive index
  • Geometric shift propagation for comparison
  • Trainable refractive index for inverse design

Quick Example

using FluxOptics, CairoMakie

xv, yv = spatial_vectors(256, 256, 1.0, 1.0)
u = ScalarField(LaguerreGaussian(25.0, 2, 1)(xv, yv), (1.0, 1.0), 1.064)

# Graded-index medium
thickness = 1500.0  # μm
n_slices = 100
r = sqrt.(xv.^2 .+ yv'.^2)
dn = -0.008 * (r/50).^2  # Parabolic profile
dn_3d = repeat(dn, 1, 1, n_slices)

n0 = 1.5  # Bulk refractive index
bpm = AS_BPM(u, thickness, n0, dn_3d)
u_out = propagate(u, bpm, Forward)

visualize((u, u_out), (intensity, phase); colormap=(:inferno, :viridis), height=120)
Example block output

Key Types

  • AS_BPM: BPM with Angular Spectrum propagation
  • Shift_BPM: BPM with geometric shifts (no diffraction)

See Also

Index