optics{ semiclassical_spectra{ } }

usage: $optional$
items: maximum 1

Compute and output emission spectra calculated from energy-resolved densities $n (x, E)$ and $p (x, E)$ computed by energy_resolved_density{}. Radiative recombination rate reads $R_{radiative} (x, E) = C (x) \int d E_{h} \int d E_{e} n (x, E_{e}) p (x, E_{h}) δ (E_{e} - E_{h} - E)$ , where $C (x)$ [ ${cm}^{3} / s$ ] is the (material-dependent) radiative recombination parameter. “spectra” and “density” in the following refer to the integrals of $R_{radiative}$ over position and energy, respectively.

Dependencies

All must be defined: energy_grid{ } / energy_resolved_density{ } / Gamma{ }
At least on of output_spectra{ } and output_local_spectra{ } must be defined.

Maintained Keywords

The keywords below are available in at least one of currently published releases and are planned to be included also in the next release.

refractive_index

usage: $optional$
type: real number
values: [1.0, ...)
unit: $-$
default: substrate

Average refractive index $n_{r}$ . Refractive index used for calculating gain and absorption spectra. The absorption/gain spectra is multiplied by the factor $1 / n_{r}^{2}$ . The values for the optical dielectric constant from the database are not used yet at this point.

energy_broadening_gaussian

usage: $optional$
type: real number
values: [1e-6, ...)
unit: $eV$

—

energy_broadening_lorentzian

usage: $optional$
type: real number
values: [1e-6, ...)
unit: $eV$

—

absorption

usage: $optional$
type: choice
values: yes or no
default: yes

—

emission

usage: $optional$
type: choice
values: yes or no
default: yes

—

local_absorption

usage: $optional$
type: choice
values: yes or no
default: no

—

local_emission

usage: $optional$
type: choice
values: yes or no
default: no

—

output_spectra{ }

usage: $optional$
items: maximum 1

When this group is defined then optical spectra computed within semi-classical models (based on carrier densities) are saved to the output folder. The spectra are averaged over the entire simulation domain.

output_spectra{ im_epsilon }

usage: $optional$
type: choice
values: yes or no
default: yes

The upper 30% of the spectra are cut off.

output_spectra{ absorption_coeff }

usage: $optional$
type: choice
values: yes or no
default: yes

Absorption spectra are outputted, both positive and negative parts. The upper 30% of the spectra are cut off.

output_spectra{ decadic_absorption_coeff }

usage: $optional$
type: choice
values: yes or no
default: no

Decadic absorption spectra are outputted, both positive and negative parts. The upper 30% of the spectra are cut off.

output_spectra{ gain }

usage: $optional$
type: choice
values: yes or no
default: yes

Gain spectra are outputted, only the positive part. The upper 30% of the spectra are cut off.

output_spectra{ decadic_gain }

usage: $optional$
type: choice
values: yes or no
default: no

Decadic gain spectra are outputted, only the positive part. The upper 30% of the spectra are cut off.

output_spectra{ emission_photons }

usage: $optional$
type: choice
values: yes or no
default: yes

Photon emission spectra are outputted, only the positive part is shown. Stimulated emission assumes that all photon modes are occupied by one photon. Thus, not the actual stimulated emission in the device is calculated, but rather a spectral response similar to the gain.

Note

The model is not suitable for systems with occupation inversion, above the threshold. It can be successfully used for modeling, e.g., LEDs.

output_spectra{ emission_power }

usage: $optional$
type: choice
values: yes or no
default: no

Power emission spectra are outputted, only the positive part is shown. Stimulated emission assumes that all photon modes are occupied by one photon. Thus, not the actual stimulated emission in the device is calculated, but rather a spectral response similar to the gain.

Note

The model is not suitable for systems with occupation inversion, above the threshold. It can be successfully used for modeling, e.g., LEDs.

output_spectra{ spectra_over_energy }

usage: $optional$
type: choice
values: yes or no
default: yes

selected spectra are outputted over energy

output_spectra{ spectra_over_frequency }

usage: $optional$
type: choice
values: yes or no
default: no

selected spectra are outputted over frequency

output_spectra{ spectra_over_wavenumber }

usage: $optional$
type: choice
values: yes or no
default: no

selected spectra are outputted over wavenumber

output_spectra{ spectra_over_wavelength }

usage: $optional$
type: choice
values: yes or no
default: no

selected spectra are outputted over wavelength

output_local_spectra{ }

usage: $optional$
items: maximum 1

When this group is defined then optical spectra computed within semi-classical models (based on carrier densities) are saved to the output folder. The spectra are position-dependent within the simulation domain.

output_local_spectra{ im_epsilon }

usage: $optional$
type: choice
values: yes or no
default: yes

The upper 30% of the spectra are cut off.

output_local_spectra{ absorption_coeff }

usage: $optional$
type: choice
values: yes or no
default: yes

Absorption spectra are outputted, both positive and negative parts. The upper 30% of the spectra are cut off.

output_local_spectra{ decadic_absorption_coeff }

usage: $optional$
type: choice
values: yes or no
default: no

Decadic absorption spectra are outputted, both positive and negative parts. The upper 30% of the spectra are cut off.

output_local_spectra{ gain }

usage: $optional$
type: choice
values: yes or no
default: yes

Gain spectra are outputted, only the positive part. The upper 30% of the spectra are cut off.

output_local_spectra{ decadic_gain }

usage: $optional$
type: choice
values: yes or no
default: no

Decadic gain spectra are outputted, only the positive part. The upper 30% of the spectra are cut off.

output_local_spectra{ emission_photons }

usage: $optional$
type: choice
values: yes or no
default: yes

Photon emission spectra are outputted, only the positive part is shown. Stimulated emission assumes that all photon modes are occupied by one photon. Thus, not the actual stimulated emission in the device is calculated, but rather a spectral response similar to the gain.

Note

The model is not suitable for systems with occupation inversion, above the threshold. It can be successfully used for modeling, e.g., LEDs.

output_local_spectra{ emission_power }

usage: $optional$
type: choice
values: yes or no
default: no

Power emission spectra are outputted, only the positive part is shown. Stimulated emission assumes that all photon modes are occupied by one photon. Thus, not the actual stimulated emission in the device is calculated, but rather a spectral response similar to the gain.

Note

The model is not suitable for systems with occupation inversion, above the threshold. It can be successfully used for modeling, e.g., LEDs.

output_local_spectra{ spectra_over_energy }

usage: $optional$
type: choice
values: yes or no
default: yes

selected spectra are outputted over energy

output_local_spectra{ spectra_over_frequency }

usage: $optional$
type: choice
values: yes or no
default: no

selected spectra are outputted over frequency

output_local_spectra{ spectra_over_wavenumber }

usage: $optional$
type: choice
values: yes or no
default: no

selected spectra are outputted over wavenumber

output_local_spectra{ spectra_over_wavelegth }

usage: $optional$
type: choice
values: yes or no
default: no

selected spectra are outputted over wavelegth

output_photon_density

usage: $optional$
type: choice
values: yes or no
default: no

Output emitted photon density in ${cm}^{- 3} s^{- 1}$ to emitted_photon_density.dat

output_power_density

usage: $optional$
type: choice
values: yes or no
default: no

Output emitted power density in $W / {cm}^{3}$ to emitted_power_density.dat

Last update: 10/12/2024