Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Widefield Microwave Imaging in Alkali Vapor Cells with sub-100 um
  Resolution   We report on widefield microwave vector field imaging with sub um resolution
using a microfabricated alkali vapor cell. The setup can additionally image dc
magnetic fields, and can be configured to image microwave electric fields. Our
camera-based widefield imaging system records 2D images with a 6x6 mm2 field of
view at a rate of 10 Hz. It provides up to 50 um spatial resolution, and allows
imaging of fields as close as 150 um above structures, through the use of thin
external cell walls. This is crucial in allowing us to take practical advantage
of the high spatial resolution, as feature sizes in near-fields are on the
order of the distance from their source, and represents an order of magnitude
improvement in surface-feature resolution compared to previous vapor cell
experiments. We present microwave and dc magnetic field images above a
selection of devices, demonstrating a microwave sensitivity of 1.4 uT/sqrt-Hz
per 50x50x140 um3 voxel, at present limited by the speed of our camera system.
Since we image 120x120 voxels in parallel, a single scanned sensor would
require a sensitivity of at least 12 nT/sqrt-Hz to produce images with the same
sensitivity. Our technique could prove transformative in the design,
characterisation, and debugging of microwave devices, as there are currently no
satisfactory established microwave imaging techniques. Moreover, it could find
applications in medical imaging.

31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
21
The categories of this paper are: adap-org
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
2
The categories of this paper are: math
4
The categories of this paper are: cond-mat
26
The categories of this paper are: bayes-an
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio