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#!/usr/bin/env python3
import bornagain as ba
from bornagain import ba_plot as bp, deg, nm, R3
r = 3*nm # particle radius
a = 25*nm # lattice constant
def get_sample():
"""
Square lattice of cylinders, with two particles per unit cell
"""
# 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)
# Particles
ff = ba.Cylinder(r, r)
particle_1 = ba.Particle(material_particle, ff)
particle_2 = ba.Particle(material_particle, ff)
particle_2.translate(R3(a/2, a/2, 0))
# Lattice basis as compound particle
basis = ba.Compound()
basis.addComponent(particle_1)
basis.addComponent(particle_2)
# 2D lattice
lattice = ba.SquareLattice2D(a, 0*deg)
iff = ba.Interference2DLattice(lattice)
profile = ba.Profile2DCauchy(480*nm, 1600*nm, 0)
iff.setDecayFunction(profile)
# Particle layout
layout = ba.ParticleLayout()
layout.addParticle(basis)
layout.setInterference(iff)
layout.setTotalParticleSurfaceDensity(0.0016)
# 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 = 11
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()
simulation = get_simulation(sample)
result = simulation.simulate()
from bornagain import ba_check
ba_check.persistence_test(result)
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