▎ 摘　　要

A plasmonic logic gate based on a tunable graphene in the region of near infrared (NIR) frequencies has been reported. The electric biasing effects are studied to control the transmission of the guided mode resonances. In the proposed configuration, white graphene is used as a substrate for graphene. Analytical and numerical results exhibit that, by doping various level in graphene through electric biasing, the characteristics of the propagation of the guided mode resonances can be manipulated and several types of logic gates including AND, OR, and XOR are obtained. The magnitude of the applied electric voltage is 0.1 mV with the footprint 1.4 mu m x 0.8 mu m x 0.206 mu m. Besides, the proposed multifunctional logic gate shows an extinction ratio of 20-50 dB at the wavelength of 7.5 mu m. This high tunable graphene-based plasmonic multifunctional logic gate can play an important role in the progression of nano-scale practical on-chip applications such as plasmonic memory devices.