Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Complete photonic bandgaps in supercell photonic crystals   We develop a class of supercell photonic crystals supporting complete
photonic bandgaps based on breaking spatial symmetries of the underlying
primitive photonic crystal. One member of this class based on a two-dimensional
honeycomb structure supports a complete bandgap for an index-contrast ratio as
low as $n_{high}/n_{low} = 2.1$, making this the first such 2D photonic crystal
to support a complete bandgap in lossless materials at visible frequencies. The
complete bandgaps found in such supercell photonic crystals do not necessarily
monotonically increase as the index-contrast in the system is increased,
disproving a long-held conjecture of complete bandgaps in photonic crystals.

0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
5
The categories of this paper are: gr-qc
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
14
The categories of this paper are: math-ph
2
The categories of this paper are: math
26
The categories of this paper are: bayes-an
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio