{
  "air_gap_half_length": 0.5,
  "beta": 8.0,
  "design_half_width": 0.48,
  "dx": 0.0625,
  "dy": 0.04,
  "dz": 0.08,
  "enforce_reflection_symmetry": true,
  "extrude_topology_z": true,
  "filter_radius": 0.16,
  "finite_lead_periods": 3,
  "finite_pml_periods": 2,
  "fixed_buffer_slices": 2,
  "grad_div_penalty": 0.0,
  "half_defect_length": 1.25,
  "half_y": 1.4,
  "half_z": 1.12,
  "lead_backend": "condensed",
  "lead_loss": 0.0001,
  "lead_max_iterations": 100,
  "lead_tolerance": 2e-9,
  "learning_rate": 0.012,
  "mask_tolerance": 1e-12,
  "n_clad": 1.0,
  "n_core": 2.0,
  "narrow_beam_width": 0.32,
  "narrow_slices": 5,
  "optimization_steps": 1,
  "pml_order": 3,
  "pml_order_x": 3,
  "pml_start_y": 1.0,
  "pml_start_z": 0.80,
  "pml_strength": 7.0,
  "pml_strength_x": 8.0,
  "projection_eta": 0.5,
  "slab_thickness": 0.32,
  "subpixel_design_envelope": true,
  "subpixel_mirror": true,
  "target_frequency": 1.0,
  "use_field_symmetry_reduction": true,
  "use_transverse_lead_symmetry_reduction": true,
  "wavelength_nm": 780.0,
  "wide_beam_width": 0.64,
  "wide_slices": 1
}