Journal
APPLIED PHYSICS LETTERS
Volume 107, Issue 20, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4935792
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- Deutsche Forschungsgemeinschaft [Sfb 787, GRK 1558]
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Submonolayer quantum dots as active medium in opto-electronic devices promise to combine the high density of states of quantum wells with the fast recovery dynamics of self-assembled quantum dots. We investigate the gain and phase recovery dynamics of a semiconductor optical amplifier based on InAs submonolayer quantum dots in the regime of linear operation by one-and two-color heterodyne pump-probe spectroscopy. We find an as fast recovery dynamics as for quantum dot-in-a-well structures, reaching 2 ps at moderate injection currents. The effective quantum well embedding the submonolayer quantum dots acts as a fast and efficient carrier reservoir. (C) 2015 AIP Publishing LLC.
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