Parabolic diamond scanning probes for single spin magnetic field imaging
- URL: http://arxiv.org/abs/2003.01733v1
- Date: Tue, 3 Mar 2020 19:00:05 GMT
- Title: Parabolic diamond scanning probes for single spin magnetic field imaging
- Authors: N. Hedrich (1), D. Rohner (1), M. Batzer (1), P. Maletinsky (1) and
B.J. Shields (1) ((1) Department of Physics, University of Basel,
Switzerland)
- Abstract summary: We develop diamond scanning probes with a truncated parabolic profile that optimize the photonic signal from single embedded NV centers.
The resulting parabolic tip shape yields a median saturation count rate of 2.1 $pm$ 0.2 MHz.
Our results mark a 5-fold improvement in measurement signal over the state-of-the art in scanning-probe based NV sensors.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Enhancing the measurement signal from solid state quantum sensors such as the
nitrogen-vacancy (NV) center in diamond is an important problem for sensing and
imaging of condensed matter systems. Here we engineer diamond scanning probes
with a truncated parabolic profile that optimizes the photonic signal from
single embedded NV centers, forming a high-sensitivity probe for nanoscale
magnetic field imaging. We develop a scalable fabrication procedure based on
dry etching with a flowable oxide mask to reliably produce a controlled tip
curvature. The resulting parabolic tip shape yields a median saturation count
rate of 2.1 $\pm$ 0.2 MHz, the highest reported for single NVs in scanning
probes to date. Furthermore, the structures operate across the full NV
photoluminescence spectrum, emitting into a numerical aperture of 0.46 and the
end-facet of the truncated tip, located near the focus of the parabola, allows
for small NV-sample spacings and nanoscale imaging. We demonstrate the
excellent properties of these diamond scanning probes by imaging ferromagnetic
stripes with a spatial resolution better than 50 nm. Our results mark a 5-fold
improvement in measurement signal over the state-of-the art in scanning-probe
based NV sensors.
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