Spontaneous long-wavelength interlevel emission in quantum-dot laser structures
L. E. Vorob’evA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. PetersburgD. A. FirsovA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. PetersburgV. A. ShalyginA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. PetersburgV. TulupenkoA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. PetersburgYu. M. ShernyakovA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. PetersburgA. Yu. EgorovA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. PetersburgA. E. ZhukovA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. PetersburgA. R. KovshA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. PetersburgP. S. Kop’evI. V. KochnevA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. PetersburgN. N. LedentsovA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. PetersburgМ. В. МаксимовA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. PetersburgV. M. UstinovA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. PetersburgZh. I. AlfërovA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. Petersburg
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Spontaneous emission has been observed for the first time as a result of interband transitions of holes and electrons between size-quantization levels in vertically coupled quantum dots and also as a result of transitions from quantum-well states to a quantum-dot level. The spectral range of the emission was in the far-infrared (λ≅10–20 μm). The long-wavelength emission was only recorded simultaneously with short-wavelength interband emission (λ≅0.94 μm) in InGaAs/AlGaAs quantum-dot laser structures at above-threshold currents.
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