Polarization-dependent carrier dynamics in a passive InAs/InP quantum dot waveguide

H. Ju, J. Molina Vázquez, Z. Li, R. Nötzel, T. Vries, de, D. Lenstra, Q. Gong, P.J. Veldhoven, van, J.H. Wolter, G.D. Khoe, H.J.S. Dorren

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Abstract

The authors investigate carrier dynamics in a passive InAs/InP quantum dot (QD) waveguide using 255 fs optical pulses at a central wavelength of 1568 nm. We observe strong anisotropy of absorption saturation for different polarizations. Pump–probe measurements indicate the presence of carrier relaxation dynamics on a timescale in the order of tens of picoseconds due to cascaded relaxation of carriers generated by two-photon absorption (TPA) from the bulk region to the QDs via the wetting layer. These relaxation timescales are much longer than in QD amplifiers. Our observations are supported by a rate-equation model which includes TPA, showing good agreement with the pump–probe measurements.
Original languageEnglish
Pages (from-to)861-867
Number of pages7
JournalOptics Communications
Volume259
Issue number2
DOIs
Publication statusPublished - 2006

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    Ju, H., Molina Vázquez, J., Li, Z., Nötzel, R., Vries, de, T., Lenstra, D., Gong, Q., Veldhoven, van, P. J., Wolter, J. H., Khoe, G. D., & Dorren, H. J. S. (2006). Polarization-dependent carrier dynamics in a passive InAs/InP quantum dot waveguide. Optics Communications, 259(2), 861-867. https://doi.org/10.1016/j.optcom.2005.09.058