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

Journal Article · · Applied Physics Letters
DOI:https://doi.org/10.1063/1.4935792· OSTI ID:22486073
; ; ; ; ;  [1]; ; ; ; ;  [2]
  1. Institut für Optik und Atomare Physik, Technische Universität Berlin, Straße des 17. Juni 135, 10623 Berlin (Germany)
  2. Institut für Festkörperphysik, Technische Universität Berlin, Hardenbergstrasse 36, 10623 Berlin (Germany)
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.
OSTI ID:
22486073
Journal Information:
Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 20 Vol. 107; ISSN APPLAB; ISSN 0003-6951
Country of Publication:
United States
Language:
English

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