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#FREE FDTD MANUAL#
#FREE FDTD PORTABLE#
#FREE FDTD SOFTWARE#
#FREE FDTD FREE#

#FREE FDTD FREE#

Stability reasons, it is recommended not to change this value. Welcome openEMS is a free and open electromagnetic field solver using the FDTD method. Simulations (the dimensionality will be derived by the shape of the grid). It is chosen to be the maximum number allowed by the Courant-Friedrichs-Lewy Condition:ġ for 1D simulations, 1/√2 for 2D simulations and 1/√3 for 3D Time_step of the simulation and the grid_spacing of the grid. Is possible to change those arrays after making the grid.įinally, the courant_number of the grid determines the relation between the Grid.inverse_permeability array of shape (grid.Nx, grid.Ny, grid.Nz, 3). Reasons) to their inverses grid.inverse_permittivity array and a Internally, these variables will be converted (for performance Permittivity for each of the major axes (so-called _uniaxial_ or _biaxial_ In the last case, the shape implies the possibility for different Recommended minimum grid_spacing turns out to be 50pmįor the permittivity and permeability floats or arrays with theĪre expected. Theory, Formulation & Implementation of 2D FDTD (free content) Theory, formulation & implementation. Wavelength 1550nm and a material with refractive index of 3.1, the Section 1.3 describes how a simple absorbing boundary con-dition is implemented. The program fd1d1.1.c at the end of the chapter is a simulation of a pulse in free space. This means that for a grid containing a source with For instance, Section 1.1 describes one-dimensional FDTD simulation in free space. For stability reasons, it is recommended toĬhoose a grid spacing that is at least 10 times smaller than the _smallest_ Internally, these numbers will be translated to threeĪ grid_spacing can be given. Given in integers, it denotes the width, height and length of the grid in terms If the shape is given in floats, itĭenotes the width, height and length of the grid in meters. Grid ( shape : Tuple, grid_spacing : float = 155e-9, permittivity : float = 1.0, permeability : float = 1.0, courant_number : float = None, )Ī grid is defined by its shape, which is just a 3D tuple of

#FREE FDTD MANUAL#

See the manual on readthedocs for the latest documentation.# signature fdtd. Johnson, MEEP: A flexible free-software package for electromagnetic simulations by the FDTD method, Computer Physics Communications, Vol. We kindly request that you cite the following paper in any published work for which you used Meep:

Visualization routines for the simulation domain involving geometries, fields, boundary layers, sources, and monitors.

Adjoint solver for inverse design and topology optimization.

Field analyses including discrete-time Fourier transform (DTFT), Poynting flux, mode decomposition (for S-parameters), energy density, near to far transformation, frequency extraction, local density of states (LDOS), modal volume, scattering cross section, Maxwell stress tensor, absorbed power density, arbitrary functions completely programmable.

GDSII file import for planar geometries.

ε/μ and field import/export in the HDF5 data format.

stray light analysis and freeform optical Free FDTD Download.

Fortunately, the Mac-exclusive Burn is a free tool perfectly proficient in burning and.

Frequency-domain solver for finding the response to a continuous-wave (CW) source as well as a frequency-domain eigensolver for finding resonant modes. Meep FDTD is a free finite-difference time-domain (FDTD) simulation.

Custom current sources with arbitrary time and spatial profile as well as a mode launcher for waveguides and planewaves, and Gaussian beams.

Subpixel smoothing for improving accuracy and shape optimization.

Exploitation of symmetries to reduce the computation size, including even/odd mirror planes and 90°/180° rotations.

Perfectly matched layer ( PML) absorbing boundaries as well as Bloch-periodic and perfect-conductor boundary conditions.

Materials library containing predefined broadband, complex refractive indices.

Variety of arbitrary material types: anisotropic electric permittivity ε and magnetic permeability μ, along with dispersive ε(ω) and μ(ω) including loss/gain, nonlinear (Kerr & Pockels) dielectric and magnetic materials, electric/magnetic conductivities σ, saturable gain/absorption, and gyrotropic media (magneto-optical effects).

Precompiled binary packages of official releases via Conda.

#FREE FDTD PORTABLE#

Portable to any Unix-like operating system such as Linux, macOS, and FreeBSD.Distributed memory parallelism on any system supporting MPI.Simulation in 1d, 2d, 3d, and cylindrical coordinates.Complete scriptability via Python, Scheme, or C++ APIs.

#FREE FDTD SOFTWARE#

Free and open-source software under the GNU GPL.Meep is a free and open-source software package for electromagnetics simulation via the finite-difference time-domain (FDTD) method spanning a broad range of applications.