Electric control of enhanced lateral shift owing to surface plasmon resonance in Kretschmann configuration with an electro-optic crystal

In this paper, the electric control of enhanced lateral shift owing to surface plasmon excitation in the Kretschmann configuration with an electro-optic crystal prism is analyzed. The large positive and negative lateral shifts are due to the excitation of surface plasmon resonance. The sign and the magnitude of the lateral shift can be conveniently controlled by adjusting the applied electric field as well as by altering the angle of incidence. Angular modulation in this configuration can be replaced by the modulation of the applied electric field since their effects on reflectivity, phase and lateral shift of the reflected beam are similar. Numerical simulations confirm the theoretical analysis.