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 μm 2 . 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.