Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: 100GHz Integrated All-Optical Switch Enabled by ALD   The carrier lifetime of a photonic crystal all-optical switch is optimized by
controlling the surface of GaAs by Atomic Layer Deposition. We demonstrate an
all optical modulation capability up to 100GHz at Telecom wavelengths, with a
contrast as high as 7dB. Wavelength conversion has also been demonstrated at a
repetition rate of 2.5GHz with average pump power of about 0.5mW

25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
26
The categories of this paper are: bayes-an
15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
7
The categories of this paper are: hep-th
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga
13
The categories of this paper are: quant-ph
34
The categories of this paper are: chem-ph