from typing import Optional
import pydantic.v1 as pd
from tidy3d.components.base import Tidy3dBaseModel
from tidy3d.components.material.solver_types import (
ChargeMediumType,
HeatMediumType,
OpticalMediumType,
)
[docs]
class MultiPhysicsMedium(Tidy3dBaseModel):
"""
Contains multiple multi-physical properties as defined for each solver medium.
Examples
--------
For *silica* (:math:`SiO_2`):
>>> import tidy3d as td
>>> SiO2 = td.MultiPhysicsMedium(
... optical=td.Medium(permittivity=3.9),
... charge=td.ChargeInsulatorMedium(permittivity=3.9), # redefining permittivity
... name="SiO2",
... )
For a silicon ``MultiPhysicsMedium`` composed of an optical model
from the material library and custom charge :class:`SemiconductorMedium`:
>>> import tidy3d as td
>>> default_multiphysics_Si = td.MultiPhysicsMedium(
... optical=td.material_library['cSi']['Green2008'],
... charge=td.SemiconductorMedium(
... N_c=2.86e19,
... N_v=3.1e19,
... E_g=1.11,
... mobility_n=td.CaugheyThomasMobility(
... mu_min=52.2,
... mu=1471.0,
... ref_N=9.68e16,
... exp_N=0.68,
... exp_1=-0.57,
... exp_2=-2.33,
... exp_3=2.4,
... exp_4=-0.146,
... ),
... mobility_p=td.CaugheyThomasMobility(
... mu_min=44.9,
... mu=470.5,
... ref_N=2.23e17,
... exp_N=0.719,
... exp_1=-0.57,
... exp_2=-2.33,
... exp_3=2.4,
... exp_4=-0.146,
... ),
... R=[
... td.ShockleyReedHallRecombination(
... tau_n=3.3e-6,
... tau_p=4e-6
... ),
... td.RadiativeRecombination(
... r_const=1.6e-14
... ),
... td.AugerRecombination(
... c_n=2.8e-31,
... c_p=9.9e-32
... ),
... ],
... delta_E_g=td.SlotboomBandGapNarrowing(
... v1=6.92 * 1e-3,
... n2=1.3e17,
... c2=0.5,
... min_N=1e15,
... ),
... N_a=0,
... N_d=0
... )
... )
"""
name: Optional[str] = pd.Field(None, title="Name", description="Medium name")
optical: Optional[OpticalMediumType] = pd.Field(
None, title="Optical properties", description="Specifies optical properties."
)
# electrical: Optional[ElectricalMediumType] = pd.Field(
# None,
# title="Electrical properties",
# description="Specifies electrical properties for RF simulations. This is currently not in use.",
# )
heat: Optional[HeatMediumType] = pd.Field(
None, title="Heat properties", description="Specifies properties for Heat simulations."
)
charge: Optional[ChargeMediumType] = pd.Field(
None, title="Charge properties", description="Specifies properties for Charge simulations."
)
[docs]
def __getattr__(self, name: str):
"""
Delegate attribute lookup to inner media or fail fast.
Parameters
----------
name : str
The attribute that could not be found on the ``MultiPhysicsMedium`` itself.
Returns
-------
Any
* The attribute value obtained from a delegated sub-medium when
``name`` is listed in ``DELEGATED_ATTRIBUTES``.
* ``None`` when ``name`` is explicitly ignored (e.g. ``"__deepcopy__"``).
Raises
------
ValueError
If ``name`` is neither ignored nor in the delegation map, signalling that
the caller may have intended to access ``optical``, ``heat``, or
``charge`` directly.
Notes
-----
Only the attributes enumerated in the local ``DELEGATED_ATTRIBUTES`` dict are
forwarded.
Extend that mapping as additional cross-medium shim behaviour becomes
necessary.
"""
# first check whether the attribute is already present
try:
return super().__getattr__(name)
except AttributeError:
pass
IGNORED_ATTRIBUTES = ["__deepcopy__"]
if name in IGNORED_ATTRIBUTES:
return None
DELEGATED_ATTRIBUTES = {
"is_pec": self.optical,
"_eps_plot": self.optical,
"viz_spec": self.optical,
}
if name in DELEGATED_ATTRIBUTES:
sub = DELEGATED_ATTRIBUTES[name]
if sub is None:
raise AttributeError(
f"Requested attribute {name!r}, but the optical medium is 'None' "
" on this 'MultiPhysicsMedium' instance."
)
return getattr(sub, name)
raise AttributeError(
f"MultiPhysicsMedium has no attribute called {name}. "
"Did you mean to access the attribute of one of the optical, heat or charge media?"
)
@property
def heat_spec(self):
if self.heat is not None:
return self.heat
if self.optical is not None:
return self.optical.heat_spec
else:
return None
