On the possibility of a terahertz light emitting diode based on a dressed quantum well

TL;DR

This paper proposes a theoretical design for a tunable terahertz light emitting diode using dressed quantum wells, where strong resonant fields induce Stark gaps enabling photon emission proportional to the dressing field.

Contribution

It introduces a novel scheme for a tunable, compact terahertz LED based on dressed quantum wells with dynamic Stark gaps in a highly doped p-n junction.

Findings

The scheme enables photon emission with energy proportional to the dressing field.

The proposed device is tunable and compact with fair efficiency.

Dynamic Stark gaps facilitate terahertz photon emission in the system.

Abstract

We consider theoretically the realization of a tunable terahertz light emitting diode from a quantum well with dressed electrons placed in a highly doped p-n junction. In the considered system the strong resonant dressing field forms dynamic Stark gaps in the valence and conduction bands and the electric field inside the p-n junction makes the QW asymmetric. It is shown that the electrons transiting through the light induced Stark gaps in the conduction band emit photons with energy directly proportional to the dressing field. This scheme is tunable, compact, and shows a fair efficiency.