Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observing Abnormally Large Group Velocity at the Plasmonic Band Edge via
  a Universal Eigenvalue Analysis   We developed a novel universal eigenvalue analysis for 2D arbitrary
nanostructures comprising dispersive and lossy materials. The complex
dispersion relation (or complex Bloch band structure) of a metallic grating is
rigorously calculated by the proposed algorithm with the finite-difference
implementation. The abnormally large group velocity is observed at a plasmonic
band edge with a large attenuation constant. Interestingly, we found the
abnormal group velocity is caused by the leaky (radiation) loss not by metallic
absorption (Ohmic) loss. The periodically modulated surface of the grating
significantly modifies the original dispersion relation of the semi-infinite
dielectric-metal structure and induces the extraordinarily large group
velocity, which is different from the near-zero group velocity at photonic band
edge. The work is fundamentally important to the design of plasmonic
nanostructures.

23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
19
The categories of this paper are: eess
0
The categories of this paper are: hep-ph
9
The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex