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Fast gain and phase recovery of semiconductor optical amplifiers based on submonolayer quantum dots

Herzog, Bastian; Owschimikow, Nina; Schulze, Jan-Hindrik; Rosales, Ricardo; Kaptan, Yücel; Kolarczik, Mirco; Switaiski, Thomas; Strittmatter, André; Bimberg, Dieter; Pohl, Udo W.; Woggon, Ulrike

Inst. Festkörperphysik

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.
  • This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Appl. Phys. Lett. 107, 201102 (2015) and may be found at https://doi.org/10.1063/1.4935792.