Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optimal unidirectional amplification induced by optical gain in
  optomechanical systems   We propose a three-mode optomechanical system to realize optical
nonreciprocal transmission with unidirectional amplification, where the system
consists of two coupled cavities and one mechanical resonator which interacts
with only one of the cavities. Additionally, the optical gain is introduced
into the optomechanical cavity. It is found that for a strong optical input,
the optical transmission coefficient can be greatly amplified in a particular
direction and suppressed in the opposite direction. The expressions of the
optimal transmission coefficient and the corresponding isolation ratio are
given analytically. Our results pave a way to design high-quality nonreciprocal
devices based on optomechanical systems.

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The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th
23
The categories of this paper are: solv-int
6
The categories of this paper are: astro-ph
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
1
The categories of this paper are: cs
7
The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg