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#!/usr/bin/env python3
# /// script
# requires-python = ">=3.10"
# dependencies = ["bornagain>=25,<26"]
# ///
"""
Specular reflectometry of a rough multilayer using the
Névot-Croce (NC) roughness model.
A 5× [PartA (2.5 nm) / PartB (5 nm)] stack on a substrate is simulated
with self-affine interface roughness and common-depth cross-correlation,
using the ErfTransient profile function (Névot-Croce model).
Compare SpecularSimulationWithRoughness.py which uses TanhTransient.
"""
import bornagain as ba
ba.require_versions("bornagain>=25,<26")
from bornagain import deg, nm, angstrom
def get_sample():
vacuum = ba.Vacuum()
substrate_color = (0.28, 0.57, 0.82)
substrate_mat = ba.RefractiveMaterial("Substrate", substrate_color, 15e-6, 0)
a_color = (0.86, 0.24, 0.18)
a_mat = ba.RefractiveMaterial("PartA", a_color, 5e-6, 0)
b_color = (0.25, 0.65, 0.35)
b_mat = ba.RefractiveMaterial("PartB", b_color, 10e-6, 0)
autocorr = ba.SelfAffineFractalModel(1*nm, 0.3, 5*nm)
crosscorr = ba.CommonDepthCrosscorrelation(10*nm)
roughness = ba.Roughness(autocorr, ba.ErfTransient(), crosscorr)
vacuum_layer = ba.Layer(vacuum)
layer_a = ba.Layer(a_mat, 2.5*nm, roughness)
layer_b = ba.Layer(b_mat, 5*nm, roughness)
substrate_layer = ba.Layer(substrate_mat, roughness)
n_repetitions = 5
stack = ba.LayerStack(n_repetitions)
stack.addLayer(layer_a)
stack.addLayer(layer_b)
sample = ba.Sample()
sample.addLayer(vacuum_layer)
sample.addStack(stack)
sample.addLayer(substrate_layer)
return sample
def get_simulation(sample):
n = 500
scan = ba.AlphaScan(n, 2*deg/n, 2*deg)
scan.setWavelength(1.54*angstrom)
return ba.SpecularSimulation(scan, sample)
if __name__ == '__main__':
sample = get_sample()
ba.showSample3D(sample, sample_size=120*nm, seed=0)
simulation = get_simulation(sample)
result = simulation.simulate()
ba.plot_datafield(result)
ba.plt.show()
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BornAgain
≻ git-develop
≻ Documentation ≻ Examples ≻ Specular ≻ Roughness and slicing ≻ NC roughness in specular
