Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Interferometric Time-Resolved Probing of Acoustic Modes in Single Gold
  Nanospheres   We measure the transient absorption of single gold particles with a
common-path interferometer. The prompt electronic part of the signal provides
high-contrast images for diameters as small as 10 nm. Mechanical vibrations of
single particles appear on a longer timescale (period of 16 ps for 50 nm
diameter). They reveal the full heterogeneity of the ensemble, and the
intrinsic damping of the vibration. We also observe a lower-frequency mode
involving shear. Ultra-fast pump-probe spectroscopy of individual particles
opens new insight into mechanical properties of nanometer-sized objects.

12
The categories of this paper are: nucl-th
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The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
34
The categories of this paper are: chem-ph
2
The categories of this paper are: math
10
The categories of this paper are: q-bio
23
The categories of this paper are: solv-int
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat