Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optical lock-in particle tracking in optical tweezers   We demonstrate a lock-in particle tracking scheme in optical tweezers based
on stroboscopic modulation of an illuminating optical field. This scheme is
found to evade low frequency noise sources while otherwise producing an
equivalent position measurement to continuous measurement. This was
demonstrated, and found to yield on average 20dB of noise suppression in the
frequency range 10-5000 Hz, where low frequency laser noise and electronic
noise was significant, and 35 dB of noise suppression in the range 550-710 kHz
where laser relaxation oscillations introduced laser noise. The setup is
simple, and compatible with any trapping optics.

27
The categories of this paper are: comp-gas
4
The categories of this paper are: cond-mat
2
The categories of this paper are: math
13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
1
The categories of this paper are: cs
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th