Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observation of a surface lattice resonance in a fractal arrangement of
  gold nanoparticles   The collective response of closely spaced metal particles in non-periodic
arrangements has the potential to provide a beneficial angular and frequency
dependence in sensing applications. In this paper, we investigate the optical
response of a Sierpinski fractal arrangement of gold nanoparticles and show
that it supports a collective resonance similar to the surface lattice
resonances that exist in periodic arrangements of plasmonic resonators. Using
back focal plane microscopy, we observe the leakage of radiation out of a
surface lattice resonance that is efficiently excited when the wavenumber of
the incident light matches a strong Fourier component of the fractal structure.
The efficient coupling between localized surface plasmons leads to a collective
resonance and a Fano-like feature in the scattering spectrum. Our experimental
observations are supported by numerical simulations based on the coupled-dipole
approximation and finite-difference time-domain methods. This work presents a
first step towards the application of fractal arrangements for plasmonic
applications

1
The categories of this paper are: cs
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
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
6
The categories of this paper are: astro-ph
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
7
The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ