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Propagation loss in photonic crystal waveguides embedding InAs/GaAs quantum dots determined by direct spectral imaging
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Paper Abstract

We determine the propagation loss of GaAs photonic crystal waveguides by spectral imaging of the spontaneous emission from the embedded InAs/GaAs quantum dots. The results are compared with the loss obtained by imaging the near field of the out-of-plane radiation of the waveguide mode propagating within the light cone. From the corresponding far field, we furthermore measure the mode wavevector, from which we determine the waveguide dispersion. Additionally, we show that spectral imaging allows to determine the relative efficiencies of the couplers. Using the same experiment, and detailed photonic simulations, we have determined the beta factor and the directionality of the emission of the QDs, finding beta factors up to 99% and high directionalities.

Paper Details

Date Published: 27 February 2019
PDF: 8 pages
Proc. SPIE 10916, Ultrafast Phenomena and Nanophotonics XXIII, 1091617 (27 February 2019); doi: 10.1117/12.2510478
Show Author Affiliations
Lorenzo Scarpelli, Cardiff Univ. (United Kingdom)
Ben Lang, Univ. of Bristol (United Kingdom)
Francesco Masia, Cardiff Univ. (United Kingdom)
Daryll Beggs, Cardiff Univ. (United Kingdom)
Egor Muljarov, Cardiff Univ. (United Kingdom)
Andrew B. Young, Univ. of Bristol (United Kingdom)
Ruth Oulton, Univ. of Bristol (United Kingdom)
Sven Höfling, Julius-Maximilians-Univ. Würzburg (Germany)
Christian Schneider, Julius-Maximilians-Univ. Würzburg (Germany)
Wolfgang Langbein, Cardiff Univ. (United Kingdom)


Published in SPIE Proceedings Vol. 10916:
Ultrafast Phenomena and Nanophotonics XXIII
Markus Betz; Abdulhakem Y. Elezzabi, Editor(s)

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