Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Generation and subwavelength focusing of longitudinal magnetic fields in
  a metallized fiber tip   We demonstrate experimentally and numerically that in fiber tips as they are
used in NSOMs azimuthally polarized electrical fields
(|E$_{\text{azi}}$|$^2$/|E$_{\text{tot}}$|$^2$ $\approx$ 55% $\pm $ 5% for
1.4\mu m tip aperture diameter and \lambda$_0$ = 1550nm), respectively
subwavelength confined (FWHM $\approx$ 450nm $\approx$ \lambda$_0$/3.5)
magnetic fields, are generated for a certain tip aperture diameter (d = 1.4\mu
m). We attribute the generation of this field distribution in metal-coated
fiber tips to symmetry breaking in the bend and subsequent plasmonic mode
filtering in the truncated conical taper.

4
The categories of this paper are: cond-mat
26
The categories of this paper are: bayes-an
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
7
The categories of this paper are: hep-th
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol