SKM 2023 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 6: Poster
KFM 6.34: Poster
Dienstag, 28. März 2023, 17:00–19:00, P3
Optical and Spin Properties of NV Center Ensembles in Diamond Nano-Pillars — •Kseniia Volkova1, Julia Heupel2, Sergei Trofimov1, Fridtjof Betz3, Rémi Colom3, Rowan W. MacQueen1, Sapida Akhundzada4, Meike Reginka4, Arno Ehresmann4, Johann Peter Reithmaier2, Sven Burger3, Cyril Popov2, and Boris Naydenov1 — 1ASPIN, Helmholtz-Zentrum Berlin, Germany — 2INA, CINSaT, University of Kassel, Kassel, Germany — 3Zuse Institute Berlin, Berlin, Germany — 4IP, CINSaT, University of Kassel, Kassel, Germany
Nitrogen-vacancy (NV) centers in diamond integrated in nano-pillars could be used as tips for scanning probe for magnetic field imaging with high sensitivity and nano-scale spatial resolution. We present the fabrication of diamond nano-pillars with diameters up to 1000 nm in type Ib diamonds with two crystal orientations [100] and [111] using electron beam lithography and inductively coupled plasma reactive ion etching. The NV centers ensembles were created by 6 keV-He ion bombardment and subsequent annealing. Estimated numbers of NVs per pillar to be 4300 ± 300 and 520 ± 120 for the [100] and [111] samples, respectively. Lifetime measurements of the NV’s excited state showed two time constants with average values of τ1 ≈ 2 ns and τ2 ≈ 8 ns, which are shorter than a single NV center in a bulk crystal. This is probably due to interaction with defects created by the helium ion bombardment and substitutional nitrogen. Optically detected magnetic resonance contrast was about 5% and average coherence times are T2 [100] = 420 ± 40 ns, T2 [111] = 560 ± 50 ns.