Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Intrinsic Optical Properties and Enhanced Plasmonic Response of
  Epitaxial Silver   Plasmonics offers an enticing platform to manipulate light at the
subwavelength scale. Currently, loss represents the most serious challenge
impeding its progress and broad impact towards practical technology. In this
regard, silver (Ag) is by far the preferred plasmonic material at optical
frequencies, having the lowest loss among all metals in this frequency range.
However, large discrepancies exist among widely quoted values of optical loss
in Ag due to variations in sample preparation procedures that produce
uncontrollable grain boundaries and defects associated with additional loss. A
natural question arises: what are the intrinsic fundamental optical properties
of Ag and its ultimate possibilities in the field of plasmonics? Using
atomically-smooth epitaxial Ag films, we extracted new optical constants that
reflect significantly reduced loss and measured greatly enhanced propagation
distance of surface plasmon polaritons (SPPs) beyond what was previously
considered possible. By establishing a new benchmark in the ultimate optical
properties of Ag, these results will have a broad impact for metamaterials and
plasmonic applications.

5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
1
The categories of this paper are: cs
8
The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
0
The categories of this paper are: hep-ph
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
25
The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin