  Optical nonreciprocity and routing using optocal microcavities draw much
atttention in recent years. Here, we report the results of the study on the
nonreciprocity and routing using optomechanical multimode interference in an
optical microcavity. The optomechanical system used here possesses
multi-optical modes and a mechanical mode. Optomechanical induced transparency
and absorption, appear in the system due to the interference between different
paths. The system can present significant nonreciprocity and routing properties
when appropriate parameters of the system are set. We design quantum devices,
such as diode, circulator and router, which are important applications. Our
work shows that optomechanical multimode system can be used as a promising
platform for buliding photonic and quantum network.
