Optimized multi-functional plasmonic logic gates by the coupling of nonlinear Kerr effect

In this work, we propose a novel structure of multifunctional optical AND and OR gates that can be realized for various functions in optical communications including parity checking, address recognition, data integrity verification, and data encryption/decryption. The AND and OR optical gates which are being demonstrated are built around a hybrid photonic crystal resonator that mixes nonlinear doped glass rods with metallic hollow circles. In this hybrid configuration, Ge rods material and Ag hollow circles fused in air are used as dielectric and metal rods, respectively. We use the FDTD and PWE methods to analyze the properties of the proposed hybrid structure. Surface plasmon polaritons is produced when the plasmonic mode created by the metallic hollow circles and the resonant PhC are properly coupled. This mode is highly confined to the metal–dielectric interface, leading to an enhancement of the optical field and an enhanced transmission of the proposed gates. With its small footprint of 134.6 µm², an excellent contrast ratio of 22.78 db and low consumption power equal to 0.4 W/µm². The hybrid AND and OR gates are well suited for applications in integrated opto-plasmonic devices.