Terahertz electroluminescence from superlattice quantum cascade structures
نویسندگان
چکیده
Intersubband electroluminescence is reported in a quantum-cascade structure based on asymmetric superlattice active regions and designed for emission in the THz range ~l'80 mm!. Comparison with a structure based on a ‘‘vertical transition’’ in a single quantum well shows an increased full width at half maximum ~2.8 vs 0.9 meV! of the emission line. In both cases the dependence of the optical power on the injected current is linear or sublinear and remains in the pW range. © 2002 American Institute of Physics. @DOI: 10.1063/1.1448393#
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