Erlangen 2018 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 43: Nano-Optics (Single Quantum Emitters)

Q 43.1: Gruppenbericht

Mittwoch, 7. März 2018, 14:00–14:30, K 0.023

Towards Energy Transfer-based Sensing and Imaging with Color Centers in Single-Crystal Diamond — •Richard Nelz, Michel Challier, Ettore Bernardi, and Elke Neu — Universität des Saarlandes, Fakultät NT - Fachrichtung Physik, Campus E2.6, 66123 Saarbrücken

Individual nitrogen vacancy (NV) color centers in diamond are bright, photo-stable dipole emitters [1]. Consequently, they represent optimal candidates for novel scanning near field microscopy techniques [2]. Here, NV centers form one member of a Förster Resonance Energy Transfer (FRET) pair. Due to their broadband emission (> 100 nm), NVs are versatile donors for FRET to systems absorbing in the near infrared spectral range. Promising applications include, e.g., nanoscale imaging of fluorescent molecules or nanomaterials like graphene [2].

Critical parameters for FRET are the NV’s quantum efficiency, charge state stability and distance to the sample. Previous experiments used NVs in nanodiamond for FRET [2], however these NVs might suffer from quenching, instability and bad control of surface termination. We here adress this issue demonstrating quenching of NVs in single crystal diamond by applying graphene to the surface.

To bring NVs close (< 10 nm) to the sample, we establish optimized approaches in fabricating cylindrical nanostructures as scanning probes.

[1] Bernardi et al., Crystals 7 124 (2017).

[2] Tisler et al., Nano Lett. 13 3152-3156 (2013).