Publication

Abstract : In ultrafast computing, all-optical integrated circuits are highly useful in overcoming the constraints of the electronic industry. In this work, we have proposed an enhanced design for an all-optical logic device using a plasmonic metal-insulator-metal (MIM) waveguide-based Mach-Zehnder interferometer (MZI). One of the interferometric arms of MZI is filled with a nonlinear Kerr material named poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV). This material is used to attain the nonlinearity in the phase of the propagating signal, leading to interferences at its output ports. For high (“1”) and low (“0”) intensity logic levels, the input beams at and , respectively, incident at the input of MZI. For high (low) input power beams, MZI obeys the principle of cross-phase (self-phase) modulation and provides the optical beam at its through (cross) port. MZI switches the optical signals across its output ports with an extinction ratio (ER) and transmission of 22 dB and 90%, respectively. Further, four MZIs are combined to design an integrated circuit to analyze and verify the operations of logic gates, half-adder logic devices, and equal-magnitude bit comparator devices. The proposed device is simulated using a two-dimensional finite-difference time-domain (FDTD) method-based tool.