Absorption dynamics of type-II GaSb/GaAs quantum dots

K Komolibus, T Piwonski, CJ Reyner, B Liang… - Optical Materials …, 2017 - opg.optica.org
K Komolibus, T Piwonski, CJ Reyner, B Liang, G Huyet, DL Huffaker, EA Viktorov
Optical Materials Express, 2017opg.optica.org
In this paper room temperature pump-probe spectroscopy is employed to study ultrafast
absorption dynamics in type-II GaSb/GaAs quantum dots (QDs). Our results identify a strong
3–5 ps timescale which is reproduced using a rate equation model and thereby associated
with hole recapture by the QD following higher order absorption of part of the pump pulse
into barrier layers. The strength of the component is attributed to cancelling effects in the
gain and phase dynamics as a result of the carrier dependence of emission frequency that is …
In this paper room temperature pump-probe spectroscopy is employed to study ultrafast absorption dynamics in type-II GaSb/GaAs quantum dots (QDs). Our results identify a strong 3–5 ps timescale which is reproduced using a rate equation model and thereby associated with hole recapture by the QD following higher order absorption of part of the pump pulse into barrier layers. The strength of the component is attributed to cancelling effects in the gain and phase dynamics as a result of the carrier dependence of emission frequency that is characteristic of type-II structures.
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