{
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  "density_nx": 76,
  "density_ny": 40,
  "design_half_width": 0.48,
  "eigensolver_maxiter": 1800,
  "eigensolver_modes": 12,
  "eigensolver_tolerance": 2e-09,
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  "fourier_order_x": 10,
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  "frequency_weight": 3.0,
  "frequency_window": 0.3,
  "gray_weight": 0.004,
  "half_defect_length": 1.25,
  "half_y": 1.04,
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  "max_backtracks": 8,
  "minimum_air_gap_energy": 0.12,
  "minimum_inner_energy": 0.18,
  "minimum_mode_overlap": 0.72,
  "minimum_step": 0.0005,
  "mirror_period": 0.375,
  "mirror_periods": 3,
  "mirror_wide_fraction": 0.3333333333333333,
  "n_clad": 1.0,
  "n_core": 2.0,
  "narrow_beam_width": 0.32,
  "nonlinear_maxiter": 26,
  "nonlinear_mixing": 0.65,
  "nonlinear_tolerance": 2e-08,
  "optimization_steps": 2,
  "projection_beta": 4.0,
  "projection_eta": 0.5,
  "slab_thickness": 0.32,
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  "terminal_buffer": 0.25,
  "vertical_nodes": 9,
  "wavelength_nm": 780.0,
  "wide_beam_width": 0.64
}