### Cylinders with Two Materials

In this example it is modelled a multi layer consisting of a substrate layer and an air layer. Cylindrical particles made of two materials are added to the air layer and their $z$ coordinate is shifted downwards in order to cross the air-substrate interface.

Scattering from cuboidal core-shell particles.

  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 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87  """ Cylindrical particle made from two materials. Particle crosses air/substrate interface. """ import bornagain as ba from bornagain import deg, angstrom, nm def get_composition(top_material, bottom_material, top_height=4.0, bottom_height=10.0): """ Returns cylindrical particle made of two different materials. """ cylinder_radius = 10*nm topPart = ba.Particle(top_material, ba.FormFactorCylinder(cylinder_radius, top_height)) bottomPart = ba.Particle(bottom_material, ba.FormFactorCylinder(cylinder_radius, bottom_height)) result = ba.ParticleComposition() result.addParticle(topPart, ba.kvector_t(0.0, 0.0, bottom_height)) result.addParticle(bottomPart) return result def get_sample(): """ Returns a multi layer with substrate/air layers. Air layer contains cylindrical particles made of two materials. Particle shifted down to cross interface. """ # defining materials m_air = ba.HomogeneousMaterial("Air", 0.0, 0.0) m_substrate = ba.HomogeneousMaterial("Substrate", 3.212e-6, 3.244e-8) m_top_part = ba.HomogeneousMaterial("Ag", 1.245e-5, 5.419e-7) m_bottom_part = ba.HomogeneousMaterial("Teflon", 2.900e-6, 6.019e-9) # collection of particles composition = get_composition(m_top_part, m_bottom_part) shift = 10.0*nm composition.setPosition(0, 0, -shift) # will be shifted below interface particle_layout = ba.ParticleLayout() particle_layout.addParticle(composition) particle_layout.setTotalParticleSurfaceDensity(1) # air layer with particles and substrate form multi layer air_layer = ba.Layer(m_air) air_layer.addLayout(particle_layout) substrate_layer = ba.Layer(m_substrate) multi_layer = ba.MultiLayer() multi_layer.addLayer(air_layer) multi_layer.addLayer(substrate_layer) print(multi_layer.treeToString()) return multi_layer def get_simulation(): """ Returns a GISAXS simulation with beam and detector defined. """ simulation = ba.GISASSimulation() simulation.setDetectorParameters(100, -1.0*deg, 1.0*deg, 100, 0.0*deg, 2.0*deg) simulation.setBeamParameters(1.0*angstrom, 0.2*deg, 0.0*deg) simulation.setBeamIntensity(1.0e+08) return simulation def run_simulation(): """ Runs simulation and returns resulting 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') 
BiMaterialCylinders.py