Quantum dot cascade laser: Arguments in favor

TL;DR

This paper advocates for quantum dot cascade lasers, highlighting their advantages over quantum well devices due to discrete spectra enabling better control of relaxation and optical properties, promising improved terahertz optoelectronic applications.

Contribution

The paper presents a detailed argument in favor of quantum dot cascade lasers, emphasizing their potential advantages over quantum well structures for terahertz applications.

Findings

Quantum dot structures have discrete spectra unlike quantum wells.

Quantum dots allow better control of non-radiative relaxation.

Quantum dots offer more flexible optical and electrical design options.

Abstract

Quantum cascade lasers are recognized as propitious candidates for future terahertz optoelectronics. Here we demonstrate several definite advantages of quantum dot cascade structures over quantum well devices, which suffer fundamental performance limitations owing to continuous carrier spectrum. The discrete spectrum of quantum dots opens an opportunity to control the non-radiative relaxation and optical loss and also provides for more flexibility in the choice of an optical and electrical design of the laser.