title: Efficient single photon source based on μ-fibre-coupled tunable microcavity.
abstract: Efficient and fast on-demand single photon sources have been sought after as critical components of quantum information science. We report an efficient and tunable single photon source based on an InAs quantum dot (QD) embedded in a photonic crystal cavity coupled with a highly curved μ-fibre. Exploiting evanescent coupling between the μ-fibre and the cavity, a high collection efficiency of 23% and Purcell-enhanced spontaneous emissions are observed. In our scheme, the spectral position of a resonance can be tuned by as much as 1.5 nm by adjusting the contact position of the μ-fibre, which increases the spectral coupling probability between the QD and the cavity mode. Taking advantage of the high photon count rate and the tunability, the collection efficiencies and the decay rates are systematically investigated as a function of the QD-cavity detuning.
authors.affiliation: Department of Physics, KAIST, Daejeon 305-701, South Korea.
authors.forename: Chang-Min
authors.initials: CM
authors.lastname: Lee
authors.affiliation: Department of Physics, KAIST, Daejeon 305-701, South Korea.
authors.forename: Hee-Jin
authors.initials: HJ
authors.lastname: Lim
authors.affiliation: Technische Physik, Physikalisches Institut and Wilhelm Conrad Röntgen-Research Center for Complex Material Systems, Universität Würzburg, Am Hubland, D-97074, Würzburg, Germany.
authors.forename: Christian
authors.initials: C
authors.lastname: Schneider
authors.affiliation: Technische Physik, Physikalisches Institut and Wilhelm Conrad Röntgen-Research Center for Complex Material Systems, Universität Würzburg, Am Hubland, D-97074, Würzburg, Germany.
authors.forename: Sebastian
authors.initials: S
authors.lastname: Maier
authors.affiliation: Technische Physik, Physikalisches Institut and Wilhelm Conrad Röntgen-Research Center for Complex Material Systems, Universität Würzburg, Am Hubland, D-97074, Würzburg, Germany.|SUPA, School of Physics and Astronomy, University of St. Andrews, St. Andrews, KY 16 9SS, UK.
authors.forename: Sven
authors.initials: S
authors.lastname: Höfling
authors.affiliation: Technische Physik, Physikalisches Institut and Wilhelm Conrad Röntgen-Research Center for Complex Material Systems, Universität Würzburg, Am Hubland, D-97074, Würzburg, Germany.
authors.forename: Martin
authors.initials: M
authors.lastname: Kamp
authors.affiliation: Department of Physics, KAIST, Daejeon 305-701, South Korea.
authors.forename: Yong-Hee
authors.initials: YH
authors.lastname: Lee