├── .github ├── ISSUE_TEMPLATE │ ├── bug_report.md │ └── feature_request.md ├── PULL_REQUEST_TEMPLATE.md └── workflows │ ├── deploy_to_pypi.yml │ ├── deploy_to_test_pypi.yml │ └── run_tests.yml ├── .gitignore ├── .readthedocs.yml ├── CITATION.cff ├── LICENSE ├── MANIFEST.in ├── README.md ├── docs ├── Makefile ├── make.bat └── source │ ├── FDTD_setup_illustration_white_background.png │ ├── NIDN_Scheme_v2.drawio.drawio.png │ ├── NIDN_logo.jpg │ ├── conf.py │ ├── index.rst │ ├── modules.rst │ ├── nidn.plots.rst │ ├── nidn.rst │ ├── nidn.tests.rst │ ├── nidn.training.model.rst │ ├── nidn.training.rst │ ├── nidn.training.utils.rst │ ├── nidn.trcwa.rst │ ├── nidn.trcwa.utils.rst │ ├── radiflector_invdesign_explanation_v2.png │ └── tutorial.rst ├── environment.yml ├── examples ├── BP-filter-3layer-eps.gif └── BP-filter-3layer-opt.gif ├── nidn ├── __init__.py ├── fdtd │ ├── __init__.py │ ├── backend.py │ ├── boundaries.py │ ├── constants.py │ ├── conversions.py │ ├── detectors.py │ ├── fourier.py │ ├── grid.py │ ├── objects.py │ ├── sources.py │ ├── typing_.py │ ├── visualization.py │ └── waveforms.py ├── fdtd_integration │ ├── __init__.py │ ├── calculate_transmission_reflection_coefficients.py │ ├── compute_fdtd_grid_scaling.py │ ├── compute_spectrum_fdtd.py │ ├── constants.py │ └── init_fdtd.py ├── materials │ ├── __init__.py │ ├── data │ │ ├── aluminium_arsenide.csv │ │ ├── aluminium_nitride.csv │ │ ├── aluminium_oxide.csv │ │ ├── gallium_arsenide.csv │ │ ├── germanium.csv │ │ ├── indium_arsenide.csv │ │ ├── readme.txt │ │ ├── removed │ │ │ └── zirconium.csv │ │ ├── silicon_nitride.csv │ │ ├── tantalum_pentoxide.csv │ │ ├── titanium_oxide.csv │ │ └── zinc_oxide.csv │ ├── find_closest_material.py │ ├── layer_builder.py │ └── material_collection.py ├── plots │ ├── __init__.py │ ├── plot_eps_per_point.py │ ├── plot_epsilon_grid.py │ ├── plot_losses.py │ ├── plot_material_grid.py │ ├── plot_model_grid.py │ ├── plot_model_grid_per_freq.py │ ├── plot_spectra.py │ ├── plot_spectrum.py │ └── save_all_plots.py ├── scripts │ └── run_cfgs.py ├── tests │ ├── __init__.py │ ├── calculate_coefficient_test.py │ ├── fdtd_test.py │ ├── material_collection_test.py │ ├── model_to_eps_grid_test.py │ ├── target_frequency_test.py │ ├── training_test.py │ ├── trcwa_test.py │ └── validate_default_cfg_test.py ├── training │ ├── __init__.py │ ├── load_run.py │ ├── losses │ │ ├── likelihood_regularization_loss.py │ │ └── spectrum_loss.py │ ├── model │ │ ├── __init__.py │ │ ├── init_network.py │ │ └── model_to_eps_grid.py │ ├── run_training.py │ ├── save_run.py │ └── utils │ │ ├── __init__.py │ │ ├── abs_layer.py │ │ ├── nerf.py │ │ ├── siren.py │ │ └── voxel.py ├── trcwa │ ├── __init__.py │ ├── compute_spectrum_trcwa.py │ ├── compute_target_frequencies.py │ ├── constants.py │ ├── get_frequency_points.py │ ├── init_trcwa.py │ ├── load_material_data.py │ ├── trcwa.py │ └── utils │ │ ├── __init__.py │ │ ├── fft_funs.py │ │ ├── kbloch.py │ │ └── torch_functions.py └── utils │ ├── README.md │ ├── compute_spectrum.py │ ├── convert_units.py │ ├── fix_random_seeds.py │ ├── global_constants.py │ ├── load_default_cfg.py │ ├── print_cfg.py │ ├── resources │ └── default_config.toml │ ├── set_log_level.py │ └── validate_config.py ├── notebooks ├── FDTD_RCWA_TMM_Comparison.ipynb ├── Forward_Model_Simulation_with_FDTD.ipynb ├── Forward_Model_Simulation_with_RCWA.ipynb ├── Inverse_Material_Design_with_FDTD.ipynb.ipynb ├── Inverse_Material_Design_with_RCWA.ipynb ├── Paper Results │ ├── 0 - TRCWA vs. GRCWA.ipynb │ ├── 1 - Structure and Material Inference.ipynb │ ├── 2 - Structure and Material Inference FDTD.ipynb │ ├── 3 - Filter Design.ipynb │ ├── 4 - Perfect Anti-Reflection.ipynb │ ├── 5 - Inversion Comparison.ipynb │ ├── Recreate all plots.ipynb │ ├── Supplementary - Ground-truth Data Generation FDTD.ipynb │ └── Supplementary - Ground-truth Data Generation.ipynb └── tmm_core.py ├── requirements.txt └── setup.py /.github/ISSUE_TEMPLATE/bug_report.md: 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