Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Particle trapping and conveying using an optical Archimedes' screw   Trapping and manipulation of particles using laser beams has become an
important tool in diverse fields of research. In recent years, particular
interest is given to the problem of conveying optically trapped particles over
extended distances either down or upstream the direction of the photons
momentum flow. Here, we propose and demonstrate experimentally an optical
analogue of the famous Archimedes' screw where the rotation of a
helical-intensity beam is transferred to the axial motion of optically-trapped
micro-meter scale airborne carbon based particles. With this optical screw,
particles were easily conveyed with controlled velocity and direction, upstream
or downstream the optical flow, over a distance of half a centimeter. Our
results offer a very simple optical conveyor that could be adapted to a wide
range of optical trapping scenarios.

14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
25
The categories of this paper are: patt-sol
26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
6
The categories of this paper are: astro-ph
9
The categories of this paper are: nlin
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
12
The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
11
The categories of this paper are: hep-lat