  We theoretically analyze the optical and optomechanical nonlinearity present
in a hybrid system consisting of a quantum dot(QD) coupled to an optomechanical
cavity in the presence of a nonlinear Kerr medium, and show that this hybrid
system can be used as an all optical switch. A high degree of control and
tunability via the QD-cavity coupling strength, the Kerr and the optomechanical
nonlinearity over the bistable behavior shown by the mean intracavity optical
field and the power transmission of the weak probe field can be achieved.The
results obtained in this investigation has the potential to be used for
designing efficient all-optical switch and high sensitive sensors for use in
Telecom systems.
