Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Large Brillouin Amplification in Silicon   Strong Brillouin coupling has only recently been realized in silicon using a
new class of optomechanical waveguides that yield both optical and phononic
confinement. Despite these major advances, appreciable Brillouin amplification
has yet to be observed in silicon. Using a new membrane-suspended silicon
waveguide we report large Brillouin amplification for the first time, reaching
levels greater than 5 dB for modest pump powers, and demonstrate a record low
(5 mW) threshold for net amplification. This work represents a crucial advance
necessary to realize high-performance Brillouin lasers and amplifiers in
silicon.

35
The categories of this paper are: mtrl-th
21
The categories of this paper are: adap-org
23
The categories of this paper are: solv-int
6
The categories of this paper are: astro-ph
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The categories of this paper are: eess
1
The categories of this paper are: cs
16
The categories of this paper are: stat
7
The categories of this paper are: hep-th
0
The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
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The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
11
The categories of this paper are: hep-lat
22
The categories of this paper are: chao-dyn