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#!/usr/bin/env python3
# /// script
# requires-python = ">=3.10"
# dependencies = ["bornagain>=25,<26"]
# ///
"""
Fresnel transmittivity and reflectivity of a multilayer sample.
Uses DepthprobeSimulation.transmitted() and .reflected().
"""
import bornagain as ba
ba.require_versions("bornagain>=25,<26")
from bornagain import deg, nm
depth = 100 * nm
def get_sample():
vac_mat = ba.Vacuum()
a_color = (0.05, 0.62, 0.55)
a_mat = ba.RefractiveMaterial("A", a_color, 6e-5, 0)
sub_color = (0.28, 0.57, 0.82)
sub_mat = ba.RefractiveMaterial("Substrate", sub_color, 3e-05, 0)
sample = ba.Sample()
sample.addLayer(ba.Layer(vac_mat))
sample.addLayer(ba.Layer(a_mat, depth))
sample.addLayer(ba.Layer(sub_mat))
return sample
def simulate():
alpha = 0.64 * deg
scan = ba.AlphaScan(1, alpha, alpha)
scan.setWavelength(0.3 * nm)
z_axis = ba.EquiDivision("z (nm)", 1, 0, 0)
simulation = ba.DepthprobeSimulation(scan, get_sample(), z_axis)
T = simulation.transmitted().flat().valAt(0)
R = simulation.reflected().flat().valAt(0)
return T, R
if __name__ == '__main__':
ba.showSample3D(get_sample(), sample_size=180*nm, seed=0)
T, R = simulate()
print(f'transmittivity: {T}')
print(f'reflectivity: {R}')
ba.plt.bar(["Transmission", "Reflection"], [T, R])
ba.plt.ylabel("Fraction")
ba.plt.ylim(0, 1)
ba.plt.show()
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