Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Transmittance and near-field characterization of sub-wavelength tapered
  optical fibers   We have produced high transmission sub-wavelength tapered optical fibers for
the purpose of whispering gallery mode coupling in fused silica microcavities
at 780 nm. A detailed analysis of the fiber transmittance evolution during
tapering is demonstrated to reflect precisely the mode coupling and cutoff in
the fiber. This allows to control the final size, the number of guided modes
and their effective index. These results are checked by evanescent wave mapping
measurements on the resulting taper.

12
The categories of this paper are: nucl-th
25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn
3
The categories of this paper are: physics
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
26
The categories of this paper are: bayes-an
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
9
The categories of this paper are: nlin
4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys