Nanoscale plasmonic combinational logic circuits based on an elliptical resonator.

The half-adder (HA) and half-subtractor (HS) plasmonic combinational logic circuits are explained using a finite element method with a COMSOL software package. The combinational circuits are created using insulator-metal-insulator technology with nanoscale plasmonic structures. In order to achieve an excellent transmission value, the phase angle of optical waves and the position of the control and input ports are the more crucial elements. In this design, the nanoscale combinational circuits are realized at a 35% transmission threshold to distinguish between the logic "0" and logic "1" stand on the interference between the input and control ports with 540 ×250 dimensions and an 850 nm resonant wavelength. The modulation depth, contrast ratio, and insertion loss have 97.38%, and 11.84 and 3.3 dB for the HA, and they have 92.38%, and 7.12 and -1.41 for the HS, respectively.