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Q: Fachverband Quantenoptik und Photonik

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

Q 55.1: Hauptvortrag

Donnerstag, 14. März 2019, 14:00–14:30, S SR 112 Maschb.

Color centers in diamond as novel atomic-scale sensors — •Elke Neu — Saarland University, Faculty for Natural Sciences and Technology, Physics, 66123 Saarbrücken

Individual, luminescent defects in diamond (color centers) are stable, atomic-scale quantum systems. Nitrogen vacancy (NV) centers also represent single electronic spins which we coherently manipulate using microwave radiation while we read-out the spin state using confocal laser fluorescence microscopy. Due to their atomic size, individual NVs form nanoscopic quantum sensors e.g. for magnetic fields and optical near fields. To enable nanoscale sensing, we incorporate the centers into tip-like photonic nanostructures. These enable scanning NV centers close (< 50 nm) to a sample to record nanoscale resolution images. Simultaneously, with these structures we retrieve bright fluorescence from the centers enhancing sensitivity. The talk will summarize our work on manufacturing and optimizing such structures. We maximize fluorescence rates via numerical simulations and pave the way towards up-scaling of sensor fabrication using novel diamond materials, while treating the diamond surface aids in stabilizing the color center charge state. Finally, we present novel sensing experiments using color centers e.g. via their interaction with 2D materials.