Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An integrated magnetometry platform with stackable waveguide-assisted
  detection channels for sensing arrays   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.

24
The categories of this paper are: dg-ga
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math
0
The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
8
The categories of this paper are: hep-ex
29
The categories of this paper are: funct-an
23
The categories of this paper are: solv-int
28
The categories of this paper are: alg-geom
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio