LightWave2D 0.3.0

A package for finite-difference time domain computation for light propagation

LightWave2D is a software designed for comprehensive 2D Finite-Difference Time-Domain (FDTD) simulations, featuring a user-friendly installation and operation process. The characterization of wave propagation, scattering, and diffraction within LightWave2D is determined by a set of specific components, as illustrated in the subsequent figure.

LightWave2D integrates various components, including waveguides, scatterers (squares, circles, ellipses, triangles, lenses), gratings, and resonators. Additional parameters governing the simulation are contingent upon the attributes of the components and the simulation setup.

---

Documentation

All the latest available documentation is available here or you can click the following badge:

---

Installation

For common versions of Windows, Linux, and macOS, (on x86_64 architecture), the package can readily be installed using pip;

>>> pip install LightWave2D

Coding examples

LightWave2D was developed with the aim of being an intuitive and easy to use tool. Below are two examples that illustrate this:

# Spherical scatterer

from LightWave2D.grid import Grid
from LightWave2D.experiment import Experiment
from MPSPlots import colormaps

grid = Grid(
    resolution=0.1e-6,
    size_x=32e-6,
    size_y=20e-6,
    n_steps=300
)

experiment = Experiment(grid=grid)

scatterer = experiment.add_circle(
    position=('30%', '50%'),
    epsilon_r=2,
    radius=3e-6
)

source = experiment.add_line_source(
    wavelength=1550e-9,
    point_0=('10%', '100%'),
    point_1=('10%', '0%'),
    amplitude=10,
)

experiment.add_pml(order=1, width=70, sigma_max=5000)

experiment.run_fdtd()

animation = experiment.render_propagation(
    skip_frame=5,
    unit_size=5,
    colormap=colormaps.polytechnique.red_black_blue
)

animation.save('./spherical_scatterer.gif', writer='Pillow', fps=10)

# Ring resonator

from LightWave2D.grid import Grid
from LightWave2D.experiment import Experiment
from MPSPlots.colormaps import polytechnique

grid = Grid(
    resolution=0.1e-6,
    size_x=50e-6,
    size_y=30e-6,
    n_steps=800
)

experiment = Experiment(grid=grid)


scatterer = experiment.add_ring_resonator(
    position=('35%', '50%'),
    epsilon_r=1.5,
    inner_radius=4e-6,
    width=2e-6
)

source = experiment.add_point_source(
    wavelength=1550e-9,
    position=('25%', '50%'),
    amplitude=100,
)

pml = experiment.add_pml(order=1, width=70, sigma_max=5000)

experiment.run_fdtd()

animation = experiment.render_propagation(skip_frame=5, colormap=polytechnique.red_black_blue)

animation.save('./resonator.gif', writer='Pillow', fps=10)

# Ring resonator

from LightWave2D.grid import Grid
from LightWave2D.experiment import Experiment
from MPSPlots import colormaps

grid = Grid(
    resolution=0.1e-6,
    size_x=60e-6,
    size_y=30e-6,
    n_steps=1200
)

experiment = Experiment(grid=grid)

scatterer = experiment.add_lense(
    position=('35%', '50%'),
    epsilon_r=2,
    curvature=10e-6,
    width=5e-6
)

source = experiment.add_point_source(
    wavelength=1550e-9,
    position=('10%', '50%'),
    amplitude=10,
)


experiment.add_pml(order=1, width=50, sigma_max=5000)

experiment.run_fdtd()

experiment.plot_frame(
    frame_number=-1,
    scale_max=5,
    colormap=colormaps.polytechnique.red_black_blue
)

animation = experiment.render_propagation(
    skip_frame=5,
    unit_size=5,
    colormap=colormaps.polytechnique.red_black_blue
)

animation.save('./lense.gif', writer='Pillow', fps=10)

Plenty of other examples are available online, I invite you to check the examples section of the documentation.

Testing

To test localy (with cloning the GitHub repository) you’ll need to install the dependencies and run the coverage command as

>>> git clone https://github.com/MartinPdeS/LightWave2D.git
>>> cd LightWave2D
>>> pip install -r requirements/requirements.txt
>>> coverage run --source=LightWave2D --module pytest --verbose tests
>>> coverage report --show-missing

---

Contact Information

As of 2024 the project is still under development if you want to collaborate it would be a pleasure. I encourage you to contact me.

LightWave2D was written by Martin Poinsinet de Sivry-Houle .

Email:[e-mail] .