Second-Harmonic Imaging of Semiconductor Quantum Dots

J. Erland, Sergei I. Bozhevolnyi, Kjeld Pedersen, J. R. Jensen, J. M. Hvam

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Resonant second-harmonic generation is observed at room temperature in reflection from self-assembled InAlGaAs quantum dots grown on a GaAs (001) substrate. The detected second-harmonic signal peaks at a pump wavelength of ∼885 nm corresponding to the quantum-dot photoluminescence maximum. In addition, the second-harmonic spectrum exhibits another smaller but well-pronounced peak at 765 nm not found in the linear experiments. We attribute this peak to the generation of second-harmonic radiation in the AlGaAs spacer layer enhanced by the local symmetry at the quantum-dot interface. We further observe that second-harmonic images of the quantum-dot surface structure show wavelength-dependent spatial variations. Imaging at different wavelength is used to demonstrate second-harmonic generation from the semiconductor quantum dots.
TidsskriftApplied Physics Letters
Udgave nummer6
Sider (fra-til)806-808
StatusUdgivet - 2000
Udgivet eksterntJa


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