Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Three-Dimensional Nanotransmission Lines at Optical Frequencies: A
  Recipe for Broadband Negative-Refraction Optical Metamaterials   Here we apply the optical nanocircuit concepts to design and analyze in
detail a three-dimensional (3-D) plasmonic nanotransmission line network that
may act as a negative-refraction broadband metamaterial at infrared and optical
frequencies. After discussing the heuristic concepts at the basis of our
theory, we show full-wave analytical results of the expected behavior of such
materials, which show increased bandwidth and relative robustness to losses.
The possibility and constraints of getting a 3-D fully isotropic response is
also explored and conditions for minimal losses and increased bandwidth are
discussed. Full-wave analytical results for some design examples employing
realistic plasmonic materials at infrared and optical frequencies are also
presented, and a case of sub-wavelength imaging system using a slab of this
material is numerically investigated.

2
The categories of this paper are: math
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
23
The categories of this paper are: solv-int
6
The categories of this paper are: astro-ph
25
The categories of this paper are: patt-sol
17
The categories of this paper are: q-fin
5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
19
The categories of this paper are: eess