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

Scarpelli, Lorenzo, Lang, Ben, Masia, Francesco, Beggs, Daryll, Muljarov, Egor, Young, Andrew B., Oulton, Ruth, Höfling, Sven, Schneider, Christian and Langbein, Wolfgang 2019. Propagation loss in photonic crystal waveguides embedding InAs/GaAs quantum dots determined by direct spectral imaging. Presented at: SPIE OPTO:, San Francisco, CA, USA, 2-7 February 2019. Proceedings Volume 10916, Ultrafast Phenomena and Nanophotonics XXIII. Society of Photo-Optical Instrumentation Engineers (SPIE), p. 42. 10.1117/12.2510478

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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.

Item Type: Conference or Workshop Item (Paper)
Date Type: Publication
Status: Published
Schools: Biosciences
Physics and Astronomy
Publisher: Society of Photo-Optical Instrumentation Engineers (SPIE)
Date of First Compliant Deposit: 14 March 2019
Date of Acceptance: 27 February 2019
Last Modified: 09 Oct 2019 13:22
URI: http://orca.cf.ac.uk/id/eprint/120687

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