Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Parallel heterodyne detection of dynamic light scattering spectra from
  gold nanoparticles diffusing in viscous fluids   We developed a microscope intended to probe, using a parallel heterodyne
receiver, the fluctuation spectrum of light quasi-elastically scattered by gold
nanoparticles diffusing in viscous fluids. The cutoff frequencies of the
recorded spectra scale up linearly with those expected from single scattering
formalism in a wide range of dynamic viscosities (1 to 15 times water viscosity
at room temperature). Our scheme enables ensemble-averaged optical fluctuations
measurements over multispeckle recordings in low light, at temporal frequencies
up to 10 kHz, with a 12 Hz framerate array detector.

1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an
18
The categories of this paper are: econ
23
The categories of this paper are: solv-int
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th
26
The categories of this paper are: bayes-an
33
The categories of this paper are: plasm-ph
2
The categories of this paper are: math
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn