Improved design of all-optical half-adder and half-subtractor circuits using MIM plasmonic waveguides for optical networks

All-optical half-adder and half-subtractor circuits are implemented through using metal–insulator-metal (MIM) waveguide utilizing a footprint of 66 μm2. The linear interference principle is used in this design at 66 μm operating wavelength, the suggested device focuses on transverse electric (TE) polarization of optical communication. Both the half-adder and half-subtractor has the identical structure which is flexible in nature. The structure consists of two Y-shaped power combiners giving optimized operation and comparison of different performance parameters such as extinction ratio, transmission efficiency and insertion loss. The device is designed mainly for ultrafast surface-plasmon polariton switching applications. The finite-difference time-domain (FDTD) technique is used to examine this design. MATLAB simulation and mathematical computation results are used to further verify the computation.