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Q: Fachverband Quantenoptik und Photonik

Q 55: Nano-Optics (Single Quantum Emitters) III

Q 55.4: Vortrag

Donnerstag, 14. März 2019, 15:00–15:15, S SR 112 Maschb.

Influence of dielectric interfaces on the angular emission characteristics of nv centers in nanodiamond — •Justus Christinck, Beatrice Rodiek, Marco López, Helmuth Hofer, Hristina Georgieva, and Stefan Kück — Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, Germany

The development of reliable and stable single photon sources attracts more and more attention. PTB already absolutely characterized a single photon emitting NV-center in a nanodiamond using a confocal microscope setup [Rodiek, 2018]. The next step is to get a better understanding of the angular emission of a NV-center, which is localized at a dielectric interface. The dielectric interface, namely a microscope cover glass, is within the near field of the emitting dipoles, which results in refraction of evanescent waves into the cover glass and a highly directional emission of photons. We present the development of a model of the angular distribution of the emitted light. First, the orientation of the transition dipole moments of NV-centers was investigated and second, using a model of the light emission by dipoles [Lukosz, 1979], the radiation patterns of an arbitrary oriented NV-center were calculated. A theoretical back focal plane image and the collection efficiency of the setup were computed. Furthermore, we present the investigation of a sample of spin-coated nanodiamonds. The NV-centers were characterized spectroscopically and by measurement of the 2nd order correlation function in a Hanbury-Brown and Twiss interferometer. Pictures of the back focal plane of the NV-center emission were taken and were compared to the theoretical back focal plane image.