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"""
Sample from the article D. Babonneau et. al., Phys. Rev. B 85, 235415, 2012 (Fig.3)
"""
import numpy
import bornagain as ba
from bornagain import deg, angstrom, nm
def get_sample():
"""
Returns a sample with a grating on a substrate, modelled by triangular ripples
forming a 1D Paracrystal.
"""
# defining materials
m_ambience = ba.HomogeneousMaterial("Air", 0.0, 0.0)
m_substrate = ba.HomogeneousMaterial("Substrate", 6e-6, 2e-8)
m_particle = ba.HomogeneousMaterial("Particle", 6e-4, 2e-8)
# collection of particles
ripple2_ff = ba.FormFactorRipple2(
100*nm, 20*nm, 4*nm, -3.0*nm)
ripple = ba.Particle(m_particle, ripple2_ff)
particle_layout = ba.ParticleLayout()
particle_layout.addParticle(ripple, 1.0)
interference = ba.InterferenceFunction2DLattice(
200.0*nm, 50.0*nm, 90.0*deg, 0.0*deg)
pdf = ba.FTDecayFunction2DGauss(
1000.*nm/2./numpy.pi, 100.*nm/2./numpy.pi)
interference.setDecayFunction(pdf)
particle_layout.setInterferenceFunction(interference)
# air layer with particles and substrate form multi layer
air_layer = ba.Layer(m_ambience)
air_layer.addLayout(particle_layout)
substrate_layer = ba.Layer(m_substrate, 0)
multi_layer = ba.MultiLayer()
multi_layer.addLayer(air_layer)
multi_layer.addLayer(substrate_layer)
return multi_layer
def get_simulation():
"""
characterizing the input beam and output detector
"""
simulation = ba.GISASSimulation()
simulation.setDetectorParameters(200, -1.5*deg, 1.5*deg,
200, 0.0*deg, 2.5*deg)
simulation.setBeamParameters(1.6*angstrom, 0.3*deg, 0.0*deg)
return simulation
def run_simulation():
"""
Runs simulation and returns intensity map.
"""
simulation = get_simulation()
simulation.setSample(get_sample())
simulation.runSimulation()
return simulation.result()
if __name__ == '__main__':
result = run_simulation()
ba.plot_simulation_result(result, cmap='jet', aspect='auto')
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