Nonlinear dielectric property of InP under strong microwave field

In this paper, the dielectric properties of indium phosphide (InP) are investigated under a strong microwave field. By introducing a re-entrant coaxial cavity, the strong microwave field is constructed, and the dielectric properties of the material are monitored using the cavity perturbation method. It is shown that the dielectric properties of InP changes obviously under the given strong microwave field. From the experimental results and theoretical analysis, we conclude that the nonlinear behaviour is caused by a kind of non-thermal microwave effect. The experimental setup and method could also be applied to predict the consequences of non-thermal microwave effects of other high power microwave materials under strong microwave field.