Room-temperature transverse-electric polarized intersubband electroluminescence from InAs/AlInAs quantum dashes

TL;DR

This paper demonstrates room-temperature transverse-electric polarized electroluminescence from InAs/AlInAs quantum dash structures, with potential applications in infrared optoelectronics, highlighting the role of electric field confinement and crystallographic orientation.

Contribution

It reports the first observation of TE-polarized electroluminescence from quantum dash structures at room temperature, with detailed analysis of the electric field confinement and polarization dependence.

Findings

Electroluminescence peaks at around 110 meV.

Emission increases with applied bias.

Temperature dependence limited by optical phonon emission.

Abstract

We report the observation of transverse electric polarized electroluminescence from InAs/AlInAs quantum dash quantum cascade structures up to room temperature. The emission is attributed to the electric field confined along the shortest lateral dimension of the dashes, as confirmed by its dependence on crystallographic orientation both in absorption measurements on a dedicated sample and from electroluminescence itself. From the absorption we estimate a dipole moment for the observed transition of <x>=1.7 nm. The electroluminescence is peaked at around 110 meV and increases with applied bias. Its temperature dependence shows a decrease at higher temperatures limited by optical phonon emission.