Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Momentum selection for enhanced adaptive focusing through
  semi-transparent media   Adaptive optics can focus light through opaque media by compensating the
random phase delay acquired while crossing a scattering curtain. The technique
is commonly exploited in many fields, including astrophysics, microscopy,
biomedicine and biology. A turbid lens has the capability of producing foci
with a resolution higher than conventional optics, however it has a fundamental
limit: to obtain a sharp focus one has to introduce a strongly scattering
medium in the optical path. Indeed a tight focusing needs strong scattering
and, as a consequence, high resolution focusing is obtained only for weakly
transmitting samples. Here we disclose an unprecedented phenomenon which allows
to obtain highly concentrated optical spots even by introducing a minimum
amount of scattering in the beam path that is with semi-transparent materials.
By filtering the pseudo-ballistic components of the transmitted beam we are
able to experimentally overcome the limits of the adaptive focus resolution,
gathering light on a spot with a diameter which is one third of the original
speckle grain.

12
The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con
2
The categories of this paper are: math
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
4
The categories of this paper are: cond-mat
19
The categories of this paper are: eess
21
The categories of this paper are: adap-org
26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
36
The categories of this paper are: cmp-lg
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio