Heidelberg 2015 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 15: Poster: Quantum Optics and Photonics I

Q 15.90: Poster

Montag, 23. März 2015, 17:00–19:00, C/Foyer

Optical trapping of nano-crystals with a deep parabolic mirror — •Vsevolod Salakhutdinov1,2, Mathieu Manceau3, Alberto Bramati3, Elisabeth Giacobino3, Markus Sondermann1,2, and Leuchs Leuchs1,21Max Planck Institute for the Science of Light, Erlangen, Germany — 2Institute of Optics, Information and Photonics, University Erlangen-Nuremberg, Erlangen, Germany — 3Laboratoire Kastler Brossel, Université Pierre et Marie Curie, Ecole Normale Supérieure, Paris , France

Many experiments involving nanoscopic single photon emitters such as quantum dots, NV centres or organic molecules would benefit from high photon-collection efficiency. Here, we aim at demonstrating high collection efficiency for photons emitted by colloidal nano-crystals. The central element of our setup is a deep parabolic mirror (PM) covering 94% of the solid angle relevant for a linear-dipole emitter [1]. This mirror serves two purposes: ensuring high collection efficiency and trapping the nano-crystals at the mirror's focus via an optical tweezers. The trapped nano-crystals are colloidal CdSe/CdS dot-in-rod (DR) particles with a radiation pattern close to the one of a linear dipole [2]. These DRs have been shown to be promising single-photon sources at room temperature [2]. The optical trap potential is provided by focusing a radially polarized, near infra-red laser beam with the PM. We discuss the experimental set-up in detail and provide an assessment of the achieved collection efficiency.

[1] R. Maiwald et al., Phys. Rev. A 86 , 043431 (2012)

[2] F. Pisanello et al., Appl. Phys. Lett. 96, 033101 (2010)

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