Mixed state effects in waveguide electro-absorbers based on quantum dots

Piwonski, T. and Pulka, J. and Huyet, G. and Houlihan, J. and Viktorov, E. A. and Erneux, T. (2011) Mixed state effects in waveguide electro-absorbers based on quantum dots. Applied Physics Letters, 99 (17). ISSN 0003-6951

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Multi-pulse heterodyne pump-probe measurements are used to investigate the reverse bias dynamics of InAs/GaAs quantum dots in a waveguide structure. Using a femtosecond pulse, we simultaneously populate high energy ground states and low energy excited states and measure the resulting gain and phase dynamics over the bandwidth of the pulse. We identify a ∼5 ps timescale in the phase dynamics which can be associated with low energy ground states outside the pulse bandwidth and may provide an explanation for the deterioration of monolithic mode locked laser performance at high reverse voltages.

Item Type: Article
Additional Information: Funding Information: The authors would like to thank Bryan Kelleher for proof reading the manuscript. This study has been supported by Science Foundation Ireland (SFI) under the contract number SFI 07/IN.1/I929, the INSPIRE Programme, funded by the Irish Government’s Programme for Research in Third Level Institutions, Cycle 4, National Development Plan 2007-2013, and the Institute of Technology Ireland’s Strand I Programme and the Tyndall National Access Program. In Belgium, support was provided by the Fond National de la Recherche Scientifique. T. Erneux was also supported by the Air Force Office of Scientific Research (AFOSR) grant FA8655-09-1-3068.
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/3100/3101
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Depositing User: Admin SSL
Date Deposited: 19 Oct 2022 23:09
Last Modified: 07 Jun 2023 18:45
URI: http://repository-testing.wit.ie/id/eprint/4423

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