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#!/usr/bin/env python3
# /// script
# requires-python = ">=3.10"
# dependencies = ["bornagain>=25,<26"]
# ///
"""
GISAS of cosine-profile ripples on a 2D paracrystal lattice.
CosineRippleBox particles (100 × 20 × 4 nm) are arranged on a
rectangular paracrystal with 20 nm × 100 nm unit cell (90° angle).
The peaks are oriented along Y (lattice vector B = 100 nm).
"""
import bornagain as ba
ba.require_versions("bornagain>=25,<26")
from bornagain import deg, nm
import math
def get_sample():
particle_color = (0.86, 0.24, 0.18)
particle_mat = ba.RefractiveMaterial("Particle", particle_color, 6e-4, 2e-8)
substrate_color = (0.28, 0.57, 0.82)
substrate_mat = ba.RefractiveMaterial("Substrate", substrate_color, 6e-6, 2e-8)
vacuum = ba.Vacuum()
length_ripple = 100 * nm
ff = ba.CosineRippleBox(length_ripple, 20 * nm, 4 * nm)
particle = ba.Particle(particle_mat, ff)
profile = ba.Profile2DGauss(150 * nm, 600 * nm, 0)
lattice = ba.BasicLattice2D(20 * nm, length_ripple, math.pi / 2, 0)
structure = ba.Paracrystal2D(particle, lattice, 1000 * nm, 1e4 * nm, 1e4 * nm)
structure.setProbabilityDistributions(profile, profile)
vacuum_layer = ba.Layer(vacuum)
substrate_layer = ba.Layer(substrate_mat)
vacuum_layer.deposit2D(structure)
sample = ba.Sample()
sample.addLayer(vacuum_layer)
sample.addLayer(substrate_layer)
return sample
def get_simulation(sample):
beam = ba.Beam(1e9, 0.1*nm, 0.2*deg)
n = 200
detector = ba.SphericalDetector(n, -2*deg, 2*deg, n, 0, 2*deg)
simulation = ba.ScatteringSimulation(beam, sample, detector)
return simulation
if __name__ == '__main__':
sample = get_sample()
ba.showSample3D(sample, sample_size=1000*nm, seed=0)
simulation = get_simulation(sample)
result = simulation.simulate()
ba.plot_datafield(result, unit_aspect=1)
ba.plt.show()
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BornAgain
≻ git-develop
≻ Documentation ≻ Examples ≻ GISAS ≻ Structures and correlations ≻ Cosine ripple
