Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Direct amplitude-phase near-field observation of higher-order anapole
  states   Anapole states associated with the resonant suppression of electric-dipole
scattering exhibit minimized extinction and maximized storage of
electromagnetic energy inside a particle. Using numerical simulations, optical
extinction spectroscopy and amplitude-phase near-field mapping of silicon
dielectric disks, we demonstrate high-order anapole states in the near-infrared
wavelength range (900-1700 nm). We develop the procedure for unambiguously
identifying anapole states by monitoring the normal component of the electric
near-field and experimentally detect the first two anapole states as verified
by far-field extinction spectroscopy and confirmed with the numerical
simulations. We demonstrate that higher order anapole states possess stronger
energy concentration and narrower resonances, a remarkable feature that is
advantageous for their applications in metasurfaces and nanophotonics
components, such as non-linear higher-harmonic generators and nanoscale lasers.

11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
20
The categories of this paper are: acc-phys
18
The categories of this paper are: econ
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
2
The categories of this paper are: math
24
The categories of this paper are: dg-ga
36
The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
4
The categories of this paper are: cond-mat