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#!/usr/bin/env python3
# /// script
# requires-python = ">=3.10"
# dependencies = ["bornagain>=25,<26"]
# ///
"""
Specular reflectometry of a Ti/Ni multilayer with a non-unit beam
intensity factor. Demonstrates that angle-scan and Q-scan yield
consistent results when the same intensity factor is applied.
10 bilayers of Ti (3 nm) and Ni (7 nm) on a Si substrate.
"""
import numpy as np
from math import pi, sin
import bornagain as ba
ba.require_versions("bornagain>=25,<26")
from bornagain import angstrom, deg, nm
INTENSITY = 1.05
def get_sample():
vacuum = ba.Vacuum()
si_color = (0.28, 0.57, 0.82)
si_mat = ba.SLDMaterial("Si_substrate", si_color, 2.0704e-6, 2.3726e-11)
ni_color = (0.93, 0.48, 0.14)
ni_mat = ba.SLDMaterial("Ni", ni_color, 9.4245e-6, 1.1423e-9)
ti_color = (0.05, 0.62, 0.55)
ti_mat = ba.SLDMaterial("Ti", ti_color, -1.9493e-6, 9.6013e-10)
stack = ba.LayerStack(10)
stack.addLayer(ba.Layer(ti_mat, 3*nm))
stack.addLayer(ba.Layer(ni_mat, 7*nm))
sample = ba.Sample()
sample.addLayer(ba.Layer(vacuum))
sample.addStack(stack)
sample.addLayer(ba.Layer(si_mat))
return sample
def simulate(sample):
n = 500
lam = 1.54*angstrom
scan_a = ba.AlphaScan(n, 5*deg/n, 5*deg)
scan_a.setWavelength(lam)
scan_a.setIntensity(INTENSITY)
result_a = ba.SpecularSimulation(scan_a, sample).simulate()
result_a.setTitle("angle scan")
qs = [4*pi*sin(a)/lam
for a in np.linspace(5*deg/n, 5*deg, n)]
scan_q = ba.QzScan(qs)
scan_q.setIntensity(INTENSITY)
result_q = ba.SpecularSimulation(scan_q, sample).simulate()
result_q.setTitle("Q scan")
return [result_a, result_q]
if __name__ == '__main__':
sample = get_sample()
ba.showSample3D(sample, sample_size=120*nm, seed=0)
results = simulate(sample)
ba.plot_multicurve(results)
ba.plt.show()
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