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Pump dependence of the dynamics of quantum dot based waveguide absorbers

par Viktorov, Evgeny ;Erneux, Thomas ;Piwonski, Tomasz;Pulka, Jaroslaw;Huyet, Guillaume;Houlihan, John
Référence Applied Physics Letters, 100, page (241108)
Publication Publié, 2012

Article révisé par les pairs

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Résumé :

The nonlinear two stage recovery of quantum dot based reverse-biased waveguide absorbers is investigated experimentally and analytically as a function of the initial ground state occupation probability of the dot. The latter is controlled experimentally by the pump pulse power. The slow stage of the recovery is exponential and its basic timescale is independent of pump power. The fast stage of the recovery is a logistic function which we analyze in detail. The relative strength of slow to fast components is highlighted and the importance of higher order absorption processes at the highest pump level is demonstrated. © 2012 American Institute of Physics.