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Khronos.jl

Khronos is a GPU-accelerated Maxwell FDTD solver written entirely in Julia.

Key Features

• GPU acceleration compatible with NVIDIA CUDA, AMD ROCm, Intel OneAPI, and Apple Metal (via KernelAbstractions.jl)
• 100% Julia code (works with Windows, Mac, and Linux)
• Specifiable precision (e.g. Float64, Float32)
• Parameterizable geometry via GeometryPrimitives.jl
• Diagonally anisotropic permittivity ($\varepsilon$) and permeability ($\mu$), and electric/magnetic conductivity terms ($\sigma_D$ / $\sigma_B$) for either the permittivity or permeability, respectively.
• Predefined current sources (including planewaves and Gaussian beams) and arbitrary curret sources.
• Equivalent sources from predefined electric and magnetic fields (e.g. to inject modes computed from a mode solver).
• Continuous-wave and Guassian-pulse time profiles
• Arbitrary 1D, 2D, or 3D (rectilinear) DFT monitors
• Perfectly matched layer (PML) absorbing boundaries
• Predefined simulation runtime functions, including run for an arbitray time and run until the DFT fields have converged.
• Simple plotting of visualization cross sections and overlayed field response, DFT monitors, and source frequency responses.
• Benchmark tooling to track performance regressions/enhancements on arbitrary hardware
• Composable kernel framework allows for the flexible definition of thousands of different kernels

Current limitations

• All simulations require PML.
• Single GPU only.
• Only linear materials without any polarizabilities.
• Uniform gridding.

License

Khronos is licensed under the MIT license.