Simplified design of a hybrid plasmonic waveguide to maximize propagation length

We design a waveguide for maximizing propagation length using the COMSOL environment based on the finite element method. The proposed design aims to achieve a high propagation distance and a constrained normalized TM mode. The range of propagation length (5−12)mm and the normalized TM mode area range can be achieved in the range of gap thickness (2−17)nm, silver thickness (1−6)nm, and arc radius 50nm. A trade-off will be between having a small mode area and a long propagation length in a successful hybrid plasmonic waveguide (HPW) design. The findings show that, with such a small mode area and long propagation length of SPPs at the wavelength 1.55μm, the suggested waveguide may avoid the unavoidable loss-confinement trade-off, which is desirable for integrated circuits. Balancing the arc radius and gap thickness at the widely used wavelength of 1.55 µm typically yields the required results. A substantial confinement coefficient has been achieved, essential in the HPW field.