Rostock 2019 – wissenschaftliches Programm
Q 24.4: Poster
Dienstag, 12. März 2019, 16:30–18:30, S Fobau Physik
Simulation of NV centers coupled to Si3N4 photonic crystal nanobeam cavities — •Jan Olthaus1, Philip Schrinner2, Carsten Schuck2, and Doris E. Reiter1 — 1Institut für Festkörpertheorie, Universität Münster, 48149 Münster, Germany — 2Physikalisches Institut, Universität Münster, 48149 Münster, Germany
The efficient integration of single-quantum emitters with photonic circuits is a major challenge for the development of quantum technologies. A scalable implementation of single-photon emitters (SPEs) on a chip requires a low-loss interface and strong light-matter interaction.
To provide such a platform we create a photonic crystal nanobeam cavity (PhC), which supports a localised mode at the wavelength of the single-photon emitter. If placed inside a resonant cavity, the spontaneous emission rate of SPEs in the weak coupling regime can be enhanced significantly (Purcell effect). The critical parameters for this enhancement are the Q-factor, mode volume and relative electric field strength at the SPEs position. A wavelength-scale mode volume can be easily achieved by an appropriate design and there are many approaches to minimise scattering losses of the defect mode.
We present results based on 3D-FDTD simulations of a PhC embedded with a Si3N4 waveguide on SiO2 substrate coupled to a NV-center in nanodiamond. Besides geometry optimisations, we analyse effects of a substrate and the positioning of an emitter with finite volume.
Our results pave the way for an efficient integration of single-photon sources into photonic circuits.