Tuning of the intersubband emission below the longitudinal optical phonon energy in GaAs/AlGaAs quantum cascade emitters

Dhillon, S.S.; Davies, A.G.; Beere, H.E.; Linfield, E.H.; Ritchie, D.A.; Arnone, D.D.
August 2003
Applied Physics Letters;8/11/2003, Vol. 83 Issue 6, p1063
Academic Journal
We present a study of far-infrared intersubband electroluminescence from a number of GaAs–Al[sub 0.15]Ga[sub 0.85]As quantum-cascade emitters with emission energies below the LO phonon energy. A range of samples with emission energies between 13 and 21 meV were investigated. A systematic decrease in the normalized emission intensity with increasing intersubband separation was observed. The possible mechanisms such as the grating coupling efficiency and the role of scattering processes are discussed. © 2003 American Institute of Physics.


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