Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nonlinear optomechanics with gain and loss: amplifying higher-order
  sideband and group delay   We study the nonlinear optomechanically-induced transparency (OMIT) with gain
and loss. We find that (i) for a single active cavity, significant enhancement
can be achieved for the higher-order sidebands, including the transmission rate
and the group delay; (ii) for active- passive-coupled cavities, hundreds of
microsecond of optical delay or advance are attainable for the nonlinear
sideband pulses in the parity-time-symmetric regime. The active higher-order
OMIT effects, as firstly revealed here, open up the way to make a low-power
optomechaical amplifier, which can amplify both the strength and group delay of
not only the probe light but also its higher-order sidebands.

11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
15
The categories of this paper are: nucl-ex
2
The categories of this paper are: math
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
5
The categories of this paper are: gr-qc
6
The categories of this paper are: astro-ph
29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
17
The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
1
The categories of this paper are: cs
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph