{
  "schema_version": 1,
  "case": "dielectric-interface",
  "title": "Watch a pulse meet a dielectric interface",
  "media_kind": "time-domain-fdtd-snapshots",
  "core_source_commit": "a9054338616b91bb1364699882c2530fa29a0048",
  "generator": "examples/visualization/field_movies.py",
  "generator_sha256": "6fb84e6c675540b332e9f65ba367e8c21295957c776741fe8058953df8a2c293",
  "environment": {
    "python": "3.10.12",
    "jax": "0.6.2",
    "numpy": "1.26.4",
    "backend": "cpu"
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  "evidence_status": "qualitative single-mesh teaching example",
  "limits": [
    "No mesh-refinement or run-length accuracy claim",
    "No measured reflection, transmission, absorption, resonance frequency, or Q",
    "2D TMz model; this is not a finite-height 3D device",
    "CPML is a finite numerical absorber and may reflect residual fields"
  ],
  "runs": [
    {
      "variant": "vacuum",
      "boundary": "cpml",
      "domain_m": [
        0.08,
        0.06,
        0.001
      ],
      "realized_display_span_m": {
        "x": [
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        "y": [
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      "mode": "2d_tmz",
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      "dt_s": 2.335067793382187e-12,
      "allocated_grid_shape": [
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        93,
        1
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      "n_steps": 640,
      "snapshot_interval": 4,
      "source": {
        "position_m": [
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          0.03,
          0.0
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        "component": "ez",
        "f0_Hz": 6000000000.0,
        "bandwidth": 0.8,
        "amplitude_A": 1e-08,
        "amplitude_kind": "current",
        "waveform": "GaussianPulse",
        "cutoff": 3.0
      },
      "probe_position_m": [
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        0.03,
        0.0
      ],
      "snapshot_slice_coord_m": 0.0005,
      "snapshot_dims": [
        "frame",
        "x",
        "y"
      ],
      "preflight_stdout": "  [PREFLIGHT] All checks passed.\n",
      "preflight_codes": []
    },
    {
      "variant": "dielectric",
      "boundary": "cpml",
      "domain_m": [
        0.08,
        0.06,
        0.001
      ],
      "realized_display_span_m": {
        "x": [
          0.0,
          0.08
        ],
        "y": [
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          0.06
        ]
      },
      "mode": "2d_tmz",
      "dx_m": 0.001,
      "dt_s": 2.335067793382187e-12,
      "allocated_grid_shape": [
        113,
        93,
        1
      ],
      "n_steps": 640,
      "snapshot_interval": 4,
      "source": {
        "position_m": [
          0.02,
          0.03,
          0.0
        ],
        "component": "ez",
        "f0_Hz": 6000000000.0,
        "bandwidth": 0.8,
        "amplitude_A": 1e-08,
        "amplitude_kind": "current",
        "waveform": "GaussianPulse",
        "cutoff": 3.0
      },
      "probe_position_m": [
        0.055,
        0.03,
        0.0
      ],
      "snapshot_slice_coord_m": 0.0005,
      "snapshot_dims": [
        "frame",
        "x",
        "y"
      ],
      "preflight_stdout": "  [PREFLIGHT] dielectric 'dielectric' on x: 12.5 cells per \u03bb_eff (eps_r=4.00, freq_max=12GHz, dx=1mm). Need \u226515 cells/\u03bb_eff for phase-accurate propagation. Yee without subpixel smoothing has 1st-order convergence at \u03b5 interfaces.\n  [PREFLIGHT] dielectric 'dielectric' on y: 12.5 cells per \u03bb_eff (eps_r=4.00, freq_max=12GHz, dx=1mm). Need \u226515 cells/\u03bb_eff for phase-accurate propagation. Yee without subpixel smoothing has 1st-order convergence at \u03b5 interfaces.\n  [PREFLIGHT] dielectric 'dielectric' on z: 12.5 cells per \u03bb_eff (eps_r=4.00, freq_max=12GHz, dx=1mm). Need \u226515 cells/\u03bb_eff for phase-accurate propagation. Yee without subpixel smoothing has 1st-order convergence at \u03b5 interfaces.\n  [PREFLIGHT] Material 'dielectric' (geometry entry #0, Box) extends into CPML region along x-axis: bbox hi face at 1m is 920mm past the x-hi absorber boundary at 80mm. CPML modifies field updates \u2014 geometry inside the absorber is physically meaningless (issue #61).\n  [PREFLIGHT] all dielectric(s) ['dielectric'] are perfectly lossless in an open (CPML) domain. If you are measuring Q / resonance, this gives an ARTIFICIALLY infinite Q (design-guide Anti-Pattern #1, an R5 surface-metric trap) \u2014 add loss, e.g. sigma = 2*pi*f*eps0*eps_r*tan_delta. (Harmless if you are not measuring Q.)\n",
      "preflight_codes": [
        "mesh_resolution",
        "mesh_resolution",
        "mesh_resolution",
        "geometry_in_absorber",
        "lossless_q"
      ]
    }
  ],
  "display": {
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    "scale": "linear -1 to +1 shared across all frames and variants",
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    "source_pixels_may_saturate": true,
    "fps": 15,
    "frame_count": 160,
    "poster_frame_index": 32,
    "poster_time_s": 3.082289487264487e-10,
    "frame_interpolation": false
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  "download": {
    "snapshot_frame_stride": 16,
    "description": "Every 16th actual movie frame, full spatial resolution; all probe samples",
    "full_arrays": "Regenerate with the script; full arrays remain in --output"
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}