Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: High-performance and power-efficient 2${\times}$2 optical switch on
  Silicon-on-Insulator   A compact (15{\mu}m${\times}${\mu}m) and highly-optimized 2${\times}$2
optical switch is demonstrated on a CMOS-compatible photonic crystal
technology. On-chip insertion loss are below 1dB, static and dynamic contrast
are 40dB and >20dB respectively. Owing to efficient thermo-optic design, the
power consumption is below 3 mW while the switching time is 1 {\mu}s.

28
The categories of this paper are: alg-geom
4
The categories of this paper are: cond-mat
18
The categories of this paper are: econ
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
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
13
The categories of this paper are: quant-ph
6
The categories of this paper are: astro-ph
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
20
The categories of this paper are: acc-phys
5
The categories of this paper are: gr-qc