Partenaires et organisations internationales
(Anglais)
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AT, BE, BG, CH, CY, CZ, DE, DK, ES, FI, FR, GR, HU, IE, IL, IT, LT, NL, PL, RO, SE, SK, UK
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Résumé des résultats (Abstract)
(Anglais)
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In this project, novel light emitters consisting of a semiconductor quantum dot coupled to a photonic crystal microcavity (PCC) are designed and fabricated. The ultrasmall mode volume and high quality factor of the microcavity are exploited to enhance the spontaneous emission rate and thus work towards the realization of efficient single-photon sources. Optically-pumped 2D photonic crystal slab microcavities with vertical emission and coupled to a waveguide are investigated. Moreover, electrically pumped 1D photonic crystal micropillar cavities are fabricated and studied. The project is a collaboration between EPF Lausanne (Prof. Fiore's group, now at TU Einhoven), and ETH Zurich (Prof. B. Witzigmann's group). Various PCC designs have been fabricated and tested at EPFL, based on the results of FEM modeling at ETHZ, and high Q factors (>3'000 in 1D PCCs and >10'000 in 2D PCCs) have been obtained. Coupling of QDs with the optical mode of both 1D and 2D PCCs has been observed, with Purcell factors as high as 8, for the first time at telecom wavelengths. A unique physics-based, fully three-dimensional simulation method has been developed, that provides the computation of all relevant key specifications, including farfield, Purcell-enhancement, material losses. For the first time, the impact of distributed quantum dots on the emission spectrum could be investigated. The project resulted in in 6 conference contributions, 4 invited talks, and 8 peer-reviewed journal publications.
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