Stark ladders as tunable far-infrared emitters

K. Donovan, P. Harrison, R. W. Kelsall

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


A superlattice of GaAs/Ga1-xAlxAs quantum wells forms a Stark ladder under the influence of a perpendicular electric field. A two level incoherent emitter system, formed by radiative intersubband transitions between adjacent wells, is investigated as a tunable far-infrared radiation source. Intersubband transition rates are calculated at 4, 77, and 300 K for applied fields from 0 to 40 kV cm-1. It is shown that the quantum efficiency of the radiative emission reaches a maximum at low temperatures for a field of 32 kV cm-1. Under these conditions the emission wavelength is 38 μm with an estimated power output of 1.1 mW.

Original languageEnglish
Pages (from-to)5175-5179
Number of pages5
JournalJournal of Applied Physics
Issue number9
Early online date14 Oct 1998
Publication statusPublished - 1 Nov 1998
Externally publishedYes


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