WasiakNew2D Class

class gain.wasiak.WasiakNew2D(name='')

Gain solver based on Fermi Golden Rule for Cartesian 2D geometry.

Subclasses

LuminescenceSpectrum	Luminescence spectrum class.
Spectrum	Gain spectrum class.

Methods

get_fermi_levels(n[, T, reg])
get_levels([T])
initialize()	Initialize solver.
invalidate()	Set the solver back to uninitialized state.
luminescence_spectrum(...)	Get luminescence spectrum at given point
spectrum(...)	Get gain spectrum at given point

Attributes

Receivers

inCarriersConcentration	Receiver of the carriers concentration required for computations [1/cm³].
inTemperature	Receiver of the temperature required for computations [K].

Providers

outGain	Provider of the computed material gain [1/cm].
outLuminescence	Provider of the computed luminescence [a.u.].

Other

Tref	Reference temperature.
adjust_layers	Adjust thicknesses of quantum wells?
broadening	roughness of the thicknesses of the quantum wells.
cond_shift	Additional conduction band shift for QW (eV)
fast_levels	Compute levels only once and simply shift for different temperatures?
geometry	Geometry provided to the solver
geometry_mod	Modified geometry for broadening calculations.
id	Id of the solver object.
initialized	True if the solver has been initialized.
lifetime	Carriers lifetime (ps)
matrix_elem	Optical matrix element (m₀ eV)
mesh	Mesh provided to the solver
roughness	roughness of the thicknesses of the quantum wells.
strained	Consider strain in QW and barriers? (True or False).
substrate	Substrate material.
vale_shift	Additional valence band shift for QW (eV)

Descriptions

Method Details

WasiakNew2D.get_fermi_levels(n, T=None, reg=0)

WasiakNew2D.get_levels(T=None)

WasiakNew2D.initialize()

Initialize solver.

This method manually initialized the solver and sets initialized to True. Normally calling it is not necessary, as each solver automatically initializes itself when needed.

Returns:

solver initialized state prior to this method call.

Return type:

bool

WasiakNew2D.invalidate()

Set the solver back to uninitialized state.

This method frees the memory allocated by the solver and sets initialized to False.

WasiakNew2D.luminescence_spectrum(c0, c1)

WasiakNew2D.luminescence_spectrum(point)

Get luminescence spectrum at given point

Get luminescence spectrum at given point

WasiakNew2D.spectrum(c0, c1)

WasiakNew2D.spectrum(point)

Get gain spectrum at given point

Get gain spectrum at given point

Receiver Details

WasiakNew2D.inCarriersConcentration = <property object>

Receiver of the carriers concentration required for computations [1/cm³].

You will find usage details in the documentation of the receiver class CarriersConcentrationReceiver2D.

Example

Connect the receiver to a provider from some other solver:

>>> solver.inCarriersConcentration = other_solver.outCarriersConcentration

See also

Receciver class: plask.flow.CarriersConcentrationReceiver2D

Provider class: plask.flow.CarriersConcentrationProvider2D

Data filter: plask.filter.CarriersConcentrationFilter2D

WasiakNew2D.inTemperature = <property object>

Receiver of the temperature required for computations [K].

You will find usage details in the documentation of the receiver class TemperatureReceiver2D.

Example

Connect the receiver to a provider from some other solver:

>>> solver.inTemperature = other_solver.outTemperature

See also

Receciver class: plask.flow.TemperatureReceiver2D

Provider class: plask.flow.TemperatureProvider2D

Data filter: plask.filter.TemperatureFilter2D

Provider Details

WasiakNew2D.outGain(n=0, mesh, lam, interpolation='default') = <property object>

Provider of the computed material gain [1/cm].

Parameters:

• deriv (str) – Gain derivative to return. can be ‘’ (empty) or ‘conc’. In the latter case, the gain derivative over carriers concentration is returned.

• mesh (mesh) – Target mesh to get the field at.

• interpolation (str) – Requested interpolation method.

• lam (float) – The wavelength at which the gain is computed (nm).

Returns:

Data with the material gain on the specified mesh [1/cm].

You may obtain the number of different values this provider can return by testing its length.

Example

Connect the provider to a receiver in some other solver:

>>> other_solver.inGain = solver.outGain

Obtain the provided field:

>>> solver.outGain(0, mesh, lam)
<plask.Data at 0x1234567>

Test the number of provided values:

>>> len(solver.outGain)
3

See also

Provider class: plask.flow.GainProvider2D

Receciver class: plask.flow.GainReceiver2D

WasiakNew2D.outLuminescence(mesh, lam, interpolation='default') = <property object>

Provider of the computed luminescence [a.u.].

Parameters:

• mesh (mesh) – Target mesh to get the field at.

• interpolation (str) – Requested interpolation method.

• lam (float) – The wavelength at which the luminescence is computed (nm).

Returns:

Data with the luminescence on the specified mesh [a.u.].

Example

Connect the provider to a receiver in some other solver:

>>> other_solver.inLuminescence = solver.outLuminescence

Obtain the provided field:

>>> solver.outLuminescence(mesh, lam)
<plask.Data at 0x1234567>

See also

Provider class: plask.flow.LuminescenceProvider2D

Receciver class: plask.flow.LuminescenceReceiver2D

Attribute Details

WasiakNew2D.Tref = <property object>

Reference temperature. If fast_levels is True, this is the temperature used for initial computation of the energy levels (K).

WasiakNew2D.adjust_layers = <property object>

Adjust thicknesses of quantum wells?

Setting this to True, allows to adjust the widths of the gain region layers by few angstroms to improve numerical stability.

WasiakNew2D.broadening = <property object>

roughness of the thicknesses of the quantum wells. With modified geometry present: broadening factor. (-).

Type:

If there is no modified geometry

WasiakNew2D.cond_shift = <property object>

Additional conduction band shift for QW (eV)

WasiakNew2D.fast_levels = <property object>

Compute levels only once and simply shift for different temperatures?

Setting this to True stongly increases computation speed, but makes the results less accurate for high gains.

WasiakNew2D.geometry = <property object>

Geometry provided to the solver

WasiakNew2D.geometry_mod = <property object>

Modified geometry for broadening calculations.

WasiakNew2D.id = <property object>

Id of the solver object. (read only)

Example

>>> mysolver.id
mysolver:category.type

WasiakNew2D.initialized = <property object>

True if the solver has been initialized. (read only)

Solvers usually get initialized at the beginning of the computations. You can clean the initialization state and free the memory by calling the invalidate() method.

WasiakNew2D.lifetime = <property object>

Carriers lifetime (ps)

WasiakNew2D.matrix_elem = <property object>

Optical matrix element (m₀ eV)

WasiakNew2D.mesh = <property object>

Mesh provided to the solver

WasiakNew2D.roughness = <property object>

roughness of the thicknesses of the quantum wells. With modified geometry present: broadening factor. (-).

Type:

If there is no modified geometry

WasiakNew2D.strained = <property object>

Consider strain in QW and barriers? (True or False).

WasiakNew2D.substrate = <property object>

Substrate material.

Material of the substrate. This is used to compute strain in the active region. If not set, the solver looks for geometry object with the __substrate__ role.

WasiakNew2D.vale_shift = <property object>

Additional valence band shift for QW (eV)