## Dense cylinders

Supposing a Simulation has been defined in which some layers contain embedded particles of different materials; to regard those layers as composed by a single material, the setUseAvgMaterials method is used:

simulation.options().setUseAvgMaterials(True)


The script below shows how to average materials when simulating scattering from a square lattice of cylinders inside a finite layer.

  1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57  #!/usr/bin/env python3 """ Square lattice of cylinders inside finite layer with usage of average material """ import bornagain as ba from bornagain import ba_plot as bp, deg, nm, R3 def get_sample(cyl_height=5*nm): """ A sample with cylinders on a substrate. """ # defining materials vacuum = ba.RefractiveMaterial("Vacuum", 0, 0) material_layer = ba.RefractiveMaterial("Layer", 3e-6, 2e-8) material_substrate = ba.RefractiveMaterial("Substrate", 6e-6, 2e-8) material_particle = ba.RefractiveMaterial("Particle", 3e-5, 2e-8) # cylindrical particle cylinder_ff = ba.Cylinder(5*nm, cyl_height) cylinder = ba.Particle(material_particle, cylinder_ff) cylinder.translate(R3(0, 0, -cyl_height)) particle_layout = ba.ParticleLayout() particle_layout.addParticle(cylinder) # interference function interference = ba.Interference2DLattice(ba.SquareLattice2D(15*nm, 0)) pdf = ba.Profile2DCauchy(300*nm, 300*nm, 0) interference.setDecayFunction(pdf) particle_layout.setInterference(interference) vacuum_layer = ba.Layer(vacuum) intermediate_layer = ba.Layer(material_layer, 5*nm) intermediate_layer.addLayout(particle_layout) substrate_layer = ba.Layer(material_substrate) sample = ba.MultiLayer() sample.addLayer(vacuum_layer) sample.addLayer(intermediate_layer) sample.addLayer(substrate_layer) return sample def get_simulation(sample): beam = ba.Beam(1e9, 0.1*nm, 0.2*deg) n = 100 detector = ba.SphericalDetector(n, -2*deg, 2*deg, n, 0, 2*deg) simulation = ba.ScatteringSimulation(beam, sample, detector) simulation.options().setUseAvgMaterials(True) return simulation if __name__ == '__main__': sample = get_sample() simulation = get_simulation(sample) result = simulation.simulate() bp.plot_simulation_result(result) 
auto/Examples/scatter2d/CylindersInAverageLayer.py