Multicone Diamond Waveguides for Nanoscale Quantum Sensing
- URL: http://arxiv.org/abs/2306.02966v1
- Date: Mon, 5 Jun 2023 15:28:12 GMT
- Title: Multicone Diamond Waveguides for Nanoscale Quantum Sensing
- Authors: Tianqi Zhu, Jan Rhensius, Viraj Damle, Konstantin Herb, Gabriel
Puebla-Hellmann, Christian L. Degen and Erika Janitz
- Abstract summary: The electronic spin of the nitrogen-vacancy center in diamond is a promising quantum sensor for detecting nanoscopic magnetic and electric fields.
Here, we address the challenge of the poor signal-to-noise ratio (SNR) of prevalent optical spin-readout techniques.
We optimize the structure in simulation, observing an increase in collection efficiency for tall ($geq$ 5 $mu$m) pillars with tapered sidewalls.
An optimized device yields increased SNR, owing to improvements in collimation and directionality of emission.
- Score: 0.5131152350448099
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: The long-lived electronic spin of the nitrogen-vacancy (NV) center in diamond
is a promising quantum sensor for detecting nanoscopic magnetic and electric
fields in a variety of experimental conditions. Nevertheless, an outstanding
challenge in improving measurement sensitivity is the poor signal-to-noise
ratio (SNR) of prevalent optical spin-readout techniques. Here, we address this
limitation by coupling individual NV centers to optimized diamond nanopillar
structures, thereby improving optical collection efficiency of fluorescence.
First, we optimize the structure in simulation, observing an increase in
collection efficiency for tall ($\geq$ 5 $\mu$m) pillars with tapered
sidewalls. We subsequently verify these predictions by fabricating and
characterizing a representative set of structures using a reliable and
reproducible nanofabrication process. An optimized device yields increased SNR,
owing to improvements in collimation and directionality of emission.
Promisingly, these devices are compatible with low-numerical-aperture,
long-working-distance collection optics, as well as reduced tip radius,
facilitating improved spatial resolution for scanning applications.
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