We propose a new mechanism for far-infrared (FIR) stimulated emission in quantum dot structures with gain and emission frequency modulated by acoustic phonon scattering. This novel mechanism is based on carrier injection into coupled quantum dot structures in the Wannier-Stark localization regime for which current oscillates due to Bragg reflection of acoustic phonons. The population inversion is achieved by engineering the quantum dot coupling and the collector tunnel barrier such that the tunnelling times fall in the range of the acoustic phonon scattering time. Realistic estimates of the gain show that FIR stimulated emission with reasonable current injection is feasible.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering
- Materials Chemistry