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Basic specular reflectometry example

As introductory example, we simulate specular reflectometry by a sample that consists of 10 Ti/Ni double layers on a Si substrate.

Full script

The same script has been used in the tutorial to explain usage and syntax of BornAgain Python code.

Root class reference: SpecularSimulation.

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#!/usr/bin/env python3
"""
Basic example of specular reflectometry simulation.
The sample consists of 20 alternating Ti and Ni layers.
"""
import bornagain as ba
from bornagain import ba_plot as bp, deg, angstrom, nm


def get_sample():
    # Materials
    vacuum = ba.Vacuum()
    ti_color = (0.05, 0.62, 0.55)
    ti_mat = ba.SLDMaterial("Ti", ti_color, -1.9493e-06, 0)
    ni_color = (0.93, 0.48, 0.14)
    ni_mat = ba.SLDMaterial("Ni", ni_color, 9.4245e-06, 0)
    si_color = (0.30, 0.62, 0.86)
    si_mat = ba.SLDMaterial("Si", si_color, 2.0704e-06, 0)

    # Layers
    top_layer = ba.Layer(vacuum)
    ti_layer = ba.Layer(ti_mat, 30*angstrom)
    ni_layer = ba.Layer(ni_mat, 70*angstrom)
    substrate = ba.Layer(si_mat)

    # Periodic stack
    n_repetitions = 10
    stack = ba.LayerStack(n_repetitions)
    stack.addLayer(ti_layer)
    stack.addLayer(ni_layer)

    # Sample
    sample = ba.Sample()
    sample.addLayer(top_layer)
    sample.addStack(stack)
    sample.addLayer(substrate)

    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()
    bp.plot_datafield(result)
    bp.plt.show()
auto/Examples/specular/AlternatingLayers1.py
Shorthand with standard sample

Since we will use the same sample in several other examples, we provide the shorthand std_samples.alternating_layers() so that the above script can be shortened as

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#!/usr/bin/env python3
"""
Basic example of specular reflectometry simulation,
using a standard sample from Wrap/Python/std_samples.py.
"""
import bornagain as ba
from bornagain import ba_plot as bp, deg, angstrom, std_samples, nm


def get_sample():
    return std_samples.alternating_layers()


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()
    bp.plot_datafield(result)
    bp.plt.show()
auto/Examples/specular/AlternatingLayers2.py