Constants

Physical Constants

constants.C_0	Speed of light in vacuum [um/s]
constants.HBAR	Reduced Planck constant [eV*s]
constants.Q_e	Fundamental charge [C]
constants.ETA_0	Vacuum impedance in Ohms
constants.EPSILON_0	Vacuum permittivity [F/um]
constants.MU_0	Vacuum permeability [H/um]
constants.K_B	Boltzmann constant [eV/K]

Tidy3D Special Constants

constants.inf

Representation of infinity used within tidy3d.

Tidy3D Configuration

config.ConfigManager

High-level orchestrator for tidy3d configuration.

Default Absorber Parameters

DefaultPMLParameters	Specifies full set of parameters needed for complex, frequency-shifted PML.
DefaultStablePMLParameters	Specifies full set of parameters needed for complex, frequency-shifted PML.
DefaultAbsorberParameters	Specifies parameters common to Absorbers and PMLs.

Units

constants.HERTZ	One cycle per second.
constants.TERAHERTZ	One trillion (10^12) cycles per second.
constants.SECOND	SI unit of time.
constants.PICOSECOND	One trillionth (10^-12) of a second.
constants.METER	SI unit of length.
constants.MICROMETER	One millionth (10^-6) of a meter.
constants.NANOMETER	One billionth (10^-9) of a meter.
constants.RADIAN	SI unit of angle.
constants.STERADIAN	SI unit of solid angle.
constants.CONDUCTIVITY	Siemens per micrometer.
constants.PERMITTIVITY	Relative permittivity.
constants.PML_SIGMA	2 times vacuum permittivity over time differential step.
constants.RADPERSEC	One radian per second.
constants.ELECTRON_VOLT	Unit of energy.
constants.KELVIN	SI unit of temperature.
constants.PML_SIGMA	2 times vacuum permittivity over time differential step.
constants.CMCUBE	Cubic centimeter unit of volume.
constants.PERCMCUBE	Unit per centimeter cube.
constants.WATT	SI unit of power.
constants.COULOMB	SI unit of electric charge.
constants.VOLT	SI unit of electric potential.
constants.THERMAL_CONDUCTIVITY	Watts per (micrometer Kelvin).
constants.SPECIFIC_HEAT_CAPACITY	Joules per (kilogram Kelvin).
constants.HEAT_FLUX	Watts per square micrometer.
constants.VOLUMETRIC_HEAT_RATE	Watts per cube micrometer.
constants.HEAT_TRANSFER_COEFF	Watts per (square micrometer Kelvin).

Precision & Comparator Values

constants.dp_eps	Double floating point precision.
constants.fp_eps	Floating point precision.
constants.pec_val	PEC values for mode solver
constants.LARGE_NUMBER	Large number used for comparing infinity.
constants.GLANCING_CUTOFF	If angle_theta is within GLANCING_CUTOFF of an odd multiple of np.pi/2 in an angled source or in mode spec, raise warning.