We report on a quantum dot quantum cascade detector（QD-QCD）, whose structure is derived from a QD cascade laser. In this structure, more ordered In As QD layers formed in the Stranski-Krastanow growth mode on a thin...We report on a quantum dot quantum cascade detector（QD-QCD）, whose structure is derived from a QD cascade laser. In this structure, more ordered In As QD layers formed in the Stranski-Krastanow growth mode on a thin Ga As buffer layer are incorporated into the active region. This QD-QCD can operate up to room temperature with a peak detection wavelength of 5.8 μm. A responsivity of 3.1 mA/W at 160 K and a detectivity of 3.6 × 10~8 Jones at 77 K are obtained. The initial performance of the detector is promising, and, by further optimizing the growth of InA s QDs, integrated QD-quantum cascade laser/QCD applications are expected.展开更多
基金supported by the National Basic Research Program of China(No.2013CB632804/02)the National Natural Science Foundation of China(Nos.61376501,61404131,and 11274301)
文摘We report on a quantum dot quantum cascade detector（QD-QCD）, whose structure is derived from a QD cascade laser. In this structure, more ordered In As QD layers formed in the Stranski-Krastanow growth mode on a thin Ga As buffer layer are incorporated into the active region. This QD-QCD can operate up to room temperature with a peak detection wavelength of 5.8 μm. A responsivity of 3.1 mA/W at 160 K and a detectivity of 3.6 × 10~8 Jones at 77 K are obtained. The initial performance of the detector is promising, and, by further optimizing the growth of InA s QDs, integrated QD-quantum cascade laser/QCD applications are expected.
