Spontaneous far-IR emission accompanying transitions of charge carriers between levels of quantum dots
Identifieur interne : 000E97 ( Russie/Analysis ); précédent : 000E96; suivant : 000E98Spontaneous far-IR emission accompanying transitions of charge carriers between levels of quantum dots
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Abstract
The spontaneous emission of far-infrared radiation (λ≅10-20 μm) from diode structures with vertically coupled InGaAs/AlGaAs quantum dots is observed. This emission is due both to transitions of holes and electrons between size-quantization levels in quantum dots and to transitions from the continuum to a level in a quantum dot. It is observed only when accompanied by lasing at short wavelengths (λ≅0.94 μm) and, like the short-wavelength emission, it exhibits a current threshold. The spontaneous emission of long-wavelength radiation is also observed in InGaAs/GaAs quantum-well laser structures. This radiation is approximately an order of magnitude weaker than that from quantum-dot structures, and it has no current threshold. © 1998 American Institute of Physics.
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Tulupenko</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Donbass State Mechanical Engineering Academy, 343913 Kramatorsk, Ukraine</s1><sZ>4 aut.</sZ></inist:fA14><country xml:lang="fr">Ukraine</country><wicri:regionArea>Donbass State Mechanical Engineering Academy, 343913 Kramatorsk</wicri:regionArea><wicri:noRegion>343913 Kramatorsk</wicri:noRegion></affiliation></author><author><name sortKey="Shernyakov, Yu M" uniqKey="Shernyakov Y">Yu. M. Shernyakov</name><affiliation wicri:level="1"><inist:fA14 i1="03"><s1>A. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia</s1><sZ>5 aut.</sZ></inist:fA14><country xml:lang="fr">Russie</country><wicri:regionArea>A. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, 194021 St. Petersburg</wicri:regionArea><wicri:noRegion>194021 St. Petersburg</wicri:noRegion></affiliation></author><author><name sortKey="Ledentsov, N N" uniqKey="Ledentsov N">N. N. 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This emission is due both to transitions of holes and electrons between size-quantization levels in quantum dots and to transitions from the continuum to a level in a quantum dot. It is observed only when accompanied by lasing at short wavelengths (λ≅0.94 μm) and, like the short-wavelength emission, it exhibits a current threshold. The spontaneous emission of long-wavelength radiation is also observed in InGaAs/GaAs quantum-well laser structures. 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