SKM 2021 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 14: Materials and devices for quantum technology (joint session HL/TT)
HL 14.4: Talk
Wednesday, September 29, 2021, 11:00–11:15, H4
Integration of NV-centers in nanodiamond in 1D photonic crystal cavities — •Jan Olthaus1, Philip P.J. Schrinner2, Carsten Schuck2, and Doris E. Reiter1 — 1Institute of Solid State Theory, University of Münster, Germany — 2Institute of Physics, Center for NanoTechnology - CeNTech and Center for Soft Nanoscience - SoN, University of Münster, Germany
The scalable integration of single-photon emitters with photonic circuits remains a major hurdle for the realisation of quantum information technologies. Efficient integration requires an interface, combining low losses and high coupling strength between these components. Here, we show results for the coupling of nitrogen vacancy centers in nanodiamond to 1D on-substrate photonic crystal cavities. In the first step, we use 3D FDTD simulations to optimise the geometry of a on-substrate photonic crystal cavity based on tantalum pentoxide waveguides. Based on the optimised structures, we then analyse the coupling conditions, if a nanodiamond cluster of varying sizes is placed in different positions around the cavity center. We find that for a deterministic air-mode design, optimal coupling is achieved when placing the nanodiamond at the air-waveguide interface within the central air-hole. Then, we validate our results experimentally by placing nanodiamonds close to the determined optimal position. We measure antibunching of the integrated photoluminescence signal proving single-photon emission. The scalability of our approach is demonstrated by simultaneous readout of the electron-spin of two neighbouring devices in a optical detected magnetic resonance measurement.