Code

Activity

Commits, issues and reviews across my public repositories over the past year.

Packages

Solvers and tools I develop, most of them behind the papers.

• gsimGDSFactory plugin for electromagnetic simulation. Takes a layout from GDS to S-parameters with the Palace (FEM), Meep and GDSFactory FDTD solvers.github.com/gdsfactory/gsimPython
• gyptisComputational photonics with the finite element method. Solves Maxwell's equations with FEniCS, with ready-made models for scattering, gratings and modal analysis.Live notebookgitlab.com/gyptis/gyptisPython
• nannosFourier modal method for multilayer metamaterials. Several FMM formulations, automatic differentiation and GPU acceleration.Live notebookgitlab.com/nannos/nannosPython
• protisPlane wave expansion method for photonic crystals, with automatic differentiation and GPU acceleration.Live notebookgitlab.com/protis/protisPython
• pytmodSolver for materials with time-modulated properties. Computes scattering and eigenmodes of time-modulated slabs.github.com/benvial/pytmodPython
• pylattNumerical models of mechanical lattices (truss and frame structures). Computes phononic band diagrams and supports automatic differentiation for metamaterial optimization.gitlab.com/benvial/pylattPython
• kloveWaves on thin elastic plates (Kirchhoff-Love theory). Multiple scattering by pins, masses and resonators, gratings, quasi-normal modes and band diagrams, all differentiable.gitlab.com/benvial/klovePython
• ashxHelpers for FEniCSx finite element simulations. Converts gmsh meshes to DOLFINx and provides geometry definition and integration helpers.gitlab.com/benvial/ashxPython
• geoliaGeometry and mesh helpers built on the Gmsh Python API. Reads meshes with their physical domains (meshio) and interpolates from unstructured to structured grids.gitlab.com/benvial/geoliaPython
• refidxRetrieves the refractive index of a material at a given wavelength from the refractiveindex.info database.gitlab.com/benvial/refidxPython
• coaxtractPermittivity extraction for multilayer stacks using an open-ended coaxial probe.gitlab.com/benvial/coaxtractPython
• cpwxtractExtracts material properties from coplanar waveguide measurements.gitlab.com/benvial/cpwxtractPython
• tdsxtractExtracts permittivity from terahertz time-domain spectroscopy measurements.github.com/tdsxtract/tdsxtractPython
• prismoFree-form doping design of silicon PN phase shifters. Gradient-based optimization of the full doping field, coupling carrier transport and optical mode solvers. Grand Prize at the Tesseract Hackathon 2026.github.com/benvial/prismoPython
• tetrachotomyFinds the poles and zeros of a function of a complex variable, with their residues.github.com/benvial/tetrachotomyPython
• pygetdpPython frontend for the GetDP finite element solver.gitlab.com/benvial/pygetdpPython

Notebooks

Worked examples you can edit and re-run in the browser, on a live kernel.

• anisotropic waveguideGuided modes and effective index of a square waveguide with a uniaxial core, for four orientations of the optic axis, with gyptis and checked against a classic benchmarkJupyter
• gyptisA hands-on introduction to finite element scattering simulations: a silicon rod, computed live with gyptis and checked against the exact solutionJupytergyptis
• nannosGuided resonances of a photonic crystal slab with the Fourier modal method: a transmission spectrum, the fields of a resonance in 3D, and a convergence studyJupyternannos
• protisPhotonic band gaps of a square lattice of dielectric rods with the plane wave expansion method: band diagram, band surfaces in 3D, gap map and gradients by automatic differentiationJupyterprotis

Solver wheels

Pip-installable builds of established simulation codes, with every native dependency inside the wheel.

• palace-solverThe Palace 3D finite element electromagnetics solver as a binary wheel for Linux (x86-64, arm64) and Apple Silicon macOS. One pip install, no conda, Docker, compiler or MPI setup.github.com/benvial/palace-solverPython
• dolfinx-solverDOLFINx (FEniCSx) as a Linux binary wheel, with complex-scalar PETSc and SLEPc built in.github.com/benvial/dolfinx-solverPython

conda-forge

Feedstocks I maintain on conda-forge.

• gyptis-feedstockconda-forge recipe for the gyptis finite element photonics package.github.com/conda-forge/gyptis-feedstock
• nannos-feedstockconda-forge recipe for the nannos Fourier modal method package.github.com/conda-forge/nannos-feedstock
• protis-feedstockconda-forge recipe for the protis plane wave expansion package.github.com/conda-forge/protis-feedstock
• tmm-feedstockconda-forge recipe for tmm, the transfer matrix method for multilayer optics.github.com/conda-forge/tmm-feedstock
• autograd-feedstockconda-forge recipe for autograd, automatic differentiation of native Python and NumPy code.github.com/conda-forge/autograd-feedstock