All-optical logic gate using waveguide-type SPR with Au/ZnO plasmon stack

We have proposed a novel all-optical logic gates based on surface plasmon resonance. The waveguide-type Kretchmann-Raether configuration with high sensitivity on the metal surface was used for all-optical logic gate. When the external light source is injected into the thin ZnO film deposited on the facet of a GaAs waveguide, the refractive index of the thin ZnO layer is changed by the absorption of external light. The proposed waveguide-type configuration is analyzed and optimized using finite-difference time-domain method for all-optical OR and NAND gates.