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

Lorenzo Scarpelli, Ben Lang, Francesco Masia, Daryll Beggs, Egor Muljarov, Andrew B. Young, Ruth Oulton, Sven Höfling, Christian Schneider, Wolfgang Langbein*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review


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.

Original languageEnglish
Title of host publicationUltrafast Phenomena and Nanophotonics XXIII
EditorsMarkus Betz, Abdulhakem Y. Elezzabi
Place of PublicationBellingham, Washington
Number of pages8
ISBN (Electronic)781510624757
ISBN (Print)9781510624740
Publication statusPublished - 27 Feb 2019
Externally publishedYes
EventUltrafast Phenomena and Nanophotonics XXIII 2019 - San Francisco, United States
Duration: 3 Feb 20196 Feb 2019

Publication series

NameProceedings of SPIE
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceUltrafast Phenomena and Nanophotonics XXIII 2019
Country/TerritoryUnited States
CitySan Francisco


  • Photonic crystal waveguide
  • Propagation loss
  • Quantum dots
  • Spectral imaging


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