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Picosecond Time-Resolved Bleaching Dynamics of Self-Assembled Quantum Dots

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Date

2004

Authors

Bogaart, E W
Haverkort, J E M
Mano, T
Notzel, Richard
Wolter, Joachim
Lever McGowan, Penelope
Jagadish, Chennupati
Tan, Hark Hoe

Journal Title

Journal ISSN

Volume Title

Publisher

Institute of Electrical and Electronics Engineers (IEEE Inc)

Abstract

Picosecond bleaching dynamics of vertically stacked self-assembled quantum dots (QDs) is investigated by means of time-resolved pump-probe differential reflection spectroscopy (TRDR) at room temperature (RT). We observe that the absorption spectrum, which represents the QD density of states at RT, is strongly shifted with respect to the photoluminescence spectrum. This shift can not be interpreted by carrier emission and re-trapping alone. TRDR allows us to study the dynamics of the pump generated carriers within the QDs. From the time-resolved measurements, we detect that the bleaching decay time has a strong energy dependence and is dominated by radiative and nonradiative recombination at low energy and by carrier emission at high energy.

Description

Keywords

Keywords: Absorption; Atomic force microscopy; Electron traps; Molecular beam epitaxy; Optical switches; Photoluminescence; Pumping (laser); Semiconductor lasers; Spectrum analysis; Bleaching (quantum dots); Bleaching decay time; Time resolved; Time resolved pump-p Bleaching; Dynamics; Quantum dots (QDs); Spectroscopy; Time resolved

Citation

URI

http://hdl.handle.net/1885/78271

Collections

ANU Research Publications

Source

IEEE Transactions on Nanotechnology

Type

Journal article

Book Title

Entity type

Access Statement

License Rights

DOI

10.1109/TNANO.2004.828572

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