Switching Power Reduction of the Plasmonic Directional Coupler by XPM Nonlinear Effect

In this letter, the nonlinear plasmonic directional coupler (PDC) with 90ž waveguide bends based on Kerr nonlinear effect has been analyzed numerically by the finite-difference time-domain method. It has been shown that by utilizing the cross-phase modulation nonlinear effect, the required switching pump and signal power of the PDC is much lower than the signal power of the one with self-phase modulation effect.