Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Compound structure one-dimensional photonic crystal   In this paper, we have proposed a new compound structure one-dimensional
photonic crystal, which include series connection, parallel connection and
positive and negative feedback compound structure photonic crystal. We have
studied their transmission characteristics and obtained some new results, which
should be help to design new type optical devices, such as optical amplifier,
photonic crystal laser and so on.

10
The categories of this paper are: q-bio
20
The categories of this paper are: acc-phys
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
19
The categories of this paper are: eess
15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
17
The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc