Super-high transmission, ultra-compact size, and very high modulation depth plasmonic de(multiplexer) based on elliptical disk resonator

Photonic devices face limits in size due to diffraction, whereas plasmonic technology allows for smaller devices. Plasmonic multiplexers/demultiplexers are crucial for all-optical arithmetic logic units, with performance measured for them by transmission (T), contrast ratio, modulation depth (MD), and insertion loss. We present, construct, and simulate a new design for an all-optical 2x1 Mux and 1x2 demultiplexer using elliptical disk insulator-metal-insulator plasmonic waveguides. A maximum transmission efficiency of 250% is displayed by this structure, a feature not investigated in previous studies. Given that the MD exceeded 98%, the proportions of this design are excellent and ideal. This entire feat was accomplished with a mere 300x250 nm size. The reason for obtaining these transmission efficiency values is that the suggested designs have three inputs. Using COMSOL Multiphysics, the proposed plasmonic Mux and Demux are simulated using the finite element method via trial and error. (c) 2025 Society of Photo-Optical Instrumentation Engineers (SPIE)