Ultrafast electroabsorption dynamics in an InAs quantum dot saturable absorber at 1.3 mu m

D. B. Malins, A. Gomez-Iglesias, S. J. White, W. Sibbett, E. U. Rafailov, Alan Miller

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Abstract

The authors report a direct measurement of the absorption dynamics in an InAs p-i-n ridge waveguide quantum dot modulator. The carrier escape mechanisms are investigated via subpicosecond pump-probe measurements at room temperature, under reverse bias conditions. The optical pulses employed are degenerate in wavelength with the quantum dot ground state transition at 1.28 mu m. The absorption change recovers with characteristic times ranging from 62 ps (0 V) to similar to 700 fs (-10 V), showing a decrease of nearly two orders of magnitude. The authors show that at low applied fields, this recovery is attributed to thermionic emission while for higher applied fields, tunneling becomes the dominant mechanism. (c) 2006 American Institute of Physics.

Original languageEnglish
Article number171111
Pages (from-to)-
Number of pages3
JournalApplied Physics Letters
Volume89
Issue number17
DOIs
Publication statusPublished - 23 Oct 2006

Keywords

  • GAIN DYNAMICS
  • AMPLIFIERS
  • OPERATION
  • ELECTRON
  • ESCAPE
  • LASER

Cite this

Malins, D. B., Gomez-Iglesias, A., White, S. J., Sibbett, W., Rafailov, E. U., & Miller, A. (2006). Ultrafast electroabsorption dynamics in an InAs quantum dot saturable absorber at 1.3 mu m. Applied Physics Letters, 89(17), -. [171111]. https://doi.org/10.1063/1.2369818