Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ultra-Low-Intensity Magneto-Optical and Mechanical Effects in Metal
  Nanocolloids   We theoretically and numerically investigate the linear and nonlinear
magneto-optical contributions to the refractive index of metal nanospheres. The
analysis is in good agreement with the experimental extinction spectra of gold
nanocolloid solutions, with threshold magnetic fields less than 1 mT when
illuminated with light intensities less than 1 W/cm^2. Plasmonic current loops
and vortex power flows provide a new framework for the dynamical interaction
between material magnetization, light polarization and nano-surfaces. The
photo-induced magneto-optical interaction of non-magnetic metal nanocolloids
imparts significant, non-negligible torque forces in nanofluids.

15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
19
The categories of this paper are: eess
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
18
The categories of this paper are: econ