Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Third-order Self-action Effects in Photonic Microcavities   Third-order nonlinear optical effects in photonic microcavities are studied.
Significant light defocusing in the thin nonlinear microcavity spacer was
observed. The polarization self-action effect was detected, when the large
nonlinear polarization rotation angle arises when exciting the microcavity
mode, being proportional to the radiation intensity.

25
The categories of this paper are: patt-sol
17
The categories of this paper are: q-fin
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
0
The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
24
The categories of this paper are: dg-ga
4
The categories of this paper are: cond-mat
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph