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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.
"""

import bornagain as ba
from bornagain import ba_plot as bp, deg, angstrom


def get_sample():
    """
    Sample consisting of 20 alternating Ti and Ni layers.
    """

    # Define materials
    m_ambient = ba.MaterialBySLD("Vacuum", 0, 0)
    m_ti = ba.MaterialBySLD("Ti", -1.9493e-06, 0)
    m_ni = ba.MaterialBySLD("Ni", 9.4245e-06, 0)
    m_substrate = ba.MaterialBySLD("SiSubstrate", 2.0704e-06, 0)

    # Define layers
    ambient_layer = ba.Layer(m_ambient)
    ti_layer = ba.Layer(m_ti, 30*angstrom)
    ni_layer = ba.Layer(m_ni, 70*angstrom)
    substrate_layer = ba.Layer(m_substrate)

    # Define sample
    sample = ba.MultiLayer()
    sample.addLayer(ambient_layer)
    for _ in range(10):
        sample.addLayer(ti_layer)
        sample.addLayer(ni_layer)
    sample.addLayer(substrate_layer)

    return sample


def get_simulation(sample):
    n = bp.simargs['n']
    scan = ba.AlphaScan(n, 2*deg/n, 2*deg)
    scan.setWavelength(1.54*angstrom)
    return ba.SpecularSimulation(scan, sample)


if __name__ == '__main__':
    bp.parse_args(sim_n=500)
    sample = get_sample()
    simulation = get_simulation(sample)
    result = simulation.simulate()
    bp.plot_simulation_result(result)
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


def get_sample():
    return std_samples.alternating_layers()


def get_simulation(sample):
    n = bp.simargs['n']
    scan = ba.AlphaScan(n, 2*deg/n, 2*deg)
    scan.setWavelength(1.54*angstrom)
    return ba.SpecularSimulation(scan, sample)


if __name__ == '__main__':
    bp.parse_args(sim_n=500)
    sample = get_sample()
    simulation = get_simulation(sample)
    result = simulation.simulate()
    bp.plot_simulation_result(result)
Examples/specular/AlternatingLayers2.py