Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Millimeter-scale and large-angle self-collimation in a photonic crystal
  composed of silicon nanorods   We report the observation of a large-angle self-collimation phenomenon
occurring in photonic crystals composed of nanorods. Electromagnetic waves
incident onto such photonic crystals from directions covering a wide-range of
incident angles become highly localized along a single array of rods, which
results in narrow-beam propagation without divergence. A propagation length of
0.4 mm is experimentally observed over the wavelength range of 1540 nm to 1570
nm, even in the large incident angle case, which is a very considerable length
scale for on-chip optical interconnection.

26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
2
The categories of this paper are: math
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex
21
The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con