The negatively-charged NV−-center in diamond has shown great success in nanoscale, high-sensitivity magnetometry. Efficient fluorescence detection is crucial for improving the sensitivity. Furthermore, integrated devices enable practicable sensors. Here, we present a novel architecture which allows us to create NV−-centers a few nanometers below the diamond surface, and at the same time in the mode field maximum of femtosecond-laser-written type-II waveguides. We experimentally verify the coupling efficiency, showcase the detection of magnetic resonance signals through the waveguides and perform first proof-of-principle experiments in magnetic field and temperature sensing. The sensing task can be operated via the waveguide without direct light illumination through the sample, which marks an important step for magnetometry in biological systems which are fragile to light. In the future, our approach will enable the development of two-dimensional sensing arrays facilitating spatially and temporally correlated magnetometry.
@article{arxiv.2012.02560,
title = {An integrated magnetometry platform with stackable waveguide-assisted detection channels for sensing arrays},
author = {Michael Hoese and Michael K. Koch and Vibhav Bharadwaj and Johannes Lang and John P. Hadden and Reina Yoshizaki and Argyro N. Giakoumaki and Roberta Ramponi and Fedor Jelezko and Shane M. Eaton and Alexander Kubanek},
journal= {arXiv preprint arXiv:2012.02560},
year = {2021}
}