Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Near-field enhanced optical tweezers utilizing femtosecond-laser
  nanostructured substrates   We present experimental evidence of plasmonic-enhanced optical tweezers, of
polystyrene beads in deionized water in the vicinity of metal-coated
nanostructures. The optical tweezers operate with a continuous wave (CW)
near-infrared laser. We employ a Cu/Au bilayer that significantly improves
dissipation of heat generated by the trapping laser beam and avoid de-trapping
from heat convection currents. We investigate the improvement of the optical
trapping force, the effective trapping quality factor, and observe an
exponential distance dependence of the trapping force from the nanostructures,
expected from the evanescent plasmon field.

27
The categories of this paper are: comp-gas
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
31
The categories of this paper are: ao-sci
16
The categories of this paper are: stat
6
The categories of this paper are: astro-ph
2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn