Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Surface enhanced nonlinear Cherenkov radiation in one-dimensional
  nonlinear photonic crystal   We study the configuration of efficient nonlinear Cerenkov diffraction
generated from a one-dimensional nonlinear photonic crystal surface, which
underlies the incorporation of both quasi-phase-matching and total internal
reflection by the crystal surface. Multidirectional radiation spots with
different Cerenkov angles are demonstrated experimentally, which results from
different orders of reciprocal vectors. At specific angles, the incident light
and total internal reflect light associating with quasi-phase-matching format
completely phase-matching scheme, leading to great enhancement of harmonic
efficiency.

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The categories of this paper are: gr-qc
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The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
8
The categories of this paper are: hep-ex
12
The categories of this paper are: nucl-th
34
The categories of this paper are: chem-ph
13
The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
17
The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas