Optical spectra

Fermi’s golden rule

The nextnano++ tool has another important calculation scheme of optical properties, which is specified in the section optics{ quantum_spectra{ } }. Here nextnano++ calculates them using the Fermi’s golden rule (time-dependent perturbation theory) with 8-band k.p model.

• Optical absorption coefficient

• Real/imaginary part of the dielectric constant

• Refractive index

• Optical gain as a negative part of optical absorption coefficient

• Spontaneous emission rate

• Transition intensity (optical matrix element)

For further detail about this section, please see Optical absorption for interband and intersubband transitions.

This page will summarize theory, that is currently distributed on the following pages:

• Intersubband transitions in InGaAs/AlInAs multiple quantum well systems

• Optical intraband transitions in a quantum well - Intraband matrix elements and selection rules

• Optical absorption for interband and intersubband transitions