Pump dependence of the dynamics of quantum dot based waveguide absorbers

Evgeny A. Viktorov, Thomas Erneux, Tomasz Piwonski, Jaroslaw Pulka, Guillaume Huyet, John Houlihan

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Article number241108
JournalApplied Physics Letters
Issue number24
Publication statusPublished - 11 Jun 2012


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