Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Integrated optical devices based on broadband epsilon-near-zero
  meta-atoms   We verify the feasibility of the proposed theoretical strategy for designing
the broadband near-zero permittivity (ENZ) metamaterial at optical frequency
range with numerical simulations. In addition, the designed broadband ENZ stack
are used as meta-atoms to build functional nanophotonic devices with
extraordinary properties, including an ultranarrow electromagnetic energy
tunneling channel and an ENZ concave focusing lens.

26
The categories of this paper are: bayes-an
25
The categories of this paper are: patt-sol
30
The categories of this paper are: q-alg
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
6
The categories of this paper are: astro-ph
17
The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th