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#!/usr/bin/env python3
"""
Cylinders of two different sizes in Size-Spacing Coupling Approximation
"""
import bornagain as ba
from bornagain import ba_plot as bp, deg, nm
import matplotlib.pyplot as plt
def get_sample():
"""
A sample with cylinders of two different sizes on a substrate.
The cylinder positions are modelled in Size-Spacing Coupling Approximation.
"""
# Materials
material_particle = ba.RefractiveMaterial("Particle", 0.0006, 2e-08)
material_substrate = ba.RefractiveMaterial("Substrate", 6e-06, 2e-08)
vacuum = ba.RefractiveMaterial("Vacuum", 0, 0)
# Form factors
ff_1 = ba.Cylinder(5*nm, 5*nm)
ff_2 = ba.Cylinder(8*nm, 8*nm)
# Particles
particle_1 = ba.Particle(material_particle, ff_1)
particle_2 = ba.Particle(material_particle, ff_2)
# Interference functions
iff = ba.InterferenceRadialParacrystal(18*nm, 1000*nm)
iff.setKappa(1)
iff_pdf = ba.Profile1DGauss(3*nm)
iff.setProbabilityDistribution(iff_pdf)
# Particle layouts
layout = ba.ParticleLayout()
layout.addParticle(particle_1, 0.8)
layout.addParticle(particle_2, 0.2)
layout.setInterference(iff)
layout.setTotalParticleSurfaceDensity(0.01)
# Layers
layer_1 = ba.Layer(vacuum)
layer_1.addLayout(layout)
layer_2 = ba.Layer(material_substrate)
# Sample
sample = ba.Sample()
sample.addLayer(layer_1)
sample.addLayer(layer_2)
return sample
def get_simulation(sample):
beam = ba.Beam(1e9, 0.1*nm, 0.2*deg)
n = 200
detector = ba.SphericalDetector(n, 0., 2*deg, n, 0., 2*deg)
simulation = ba.ScatteringSimulation(beam, sample, detector)
return simulation
if __name__ == '__main__':
sample = get_sample()
simulation = get_simulation(sample)
result = simulation.simulate()
bp.plot_simulation_result(result)
plt.show()
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