{
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  "target_frequency": 1.0,
  "n_core": 2.0,
  "n_clad": 1.0,
  "dx": 0.125,
  "dy": 0.12,
  "dz": 0.12,
  "half_defect_length": 1.25,
  "half_y": 1.08,
  "half_z": 0.84,
  "air_gap_half_length": 0.5,
  "slab_thickness": 0.32,
  "wide_beam_width": 0.64,
  "narrow_beam_width": 0.32,
  "design_half_width": 0.48,
  "fixed_buffer_slices": 2,
  "wide_slices": 1,
  "narrow_slices": 2,
  "pml_start_y": 0.78,
  "pml_start_z": 0.54,
  "pml_strength": 7.0,
  "pml_order": 3,
  "mask_tolerance": 1e-12,
  "grad_div_penalty": 0.0,
  "filter_radius": 0.15,
  "projection_eta": 0.5,
  "beta": 8.0,
  "enforce_reflection_symmetry": true,
  "lead_loss": 1e-10,
  "lead_max_iterations": 100,
  "lead_tolerance": 2e-10,
  "lead_backend": "condensed",
  "optimization_steps": 3,
  "learning_rate": 0.012
}