Using Quantum Dot Structure and Suitable Material for Increasing Propagation Length of Surface Plasmon Polariton

Hybrid surface plasmon polariton waveguides (HSPPWGs) are used to transmit and manipulate nanoscale optical signals as plasmonic waveguides. This increases optical communication network bandwidth and data transmission rates. Due to their unique properties, HSPPWGs are versatile photonics and integrated optics platforms. In order to achieve better results, the study used several proposed structures and simulated them using the COMSOL Multiphysics software with MATLAB. The gain in the quantum dots significantly improved the results with a choice of certain semiconductor active material. The aim is to reach more than ten times the original length (without material gain) and have good quantum confinement according to the FoM test and Γ-confinement factor, which causes a jump in the calculated propagation length of the hybrid waveguide. Three cases result for propagation lengths in the first case High QDisk 2 nm indicates a maximum Lp value of 37 μm at λ = 1550 nm and 30 μm at λ = 1300 nm. The second case involves increased propagation length in the 1300 – 1600 nm wavelength range, with Lp = 55 μm at λ = 1550 nm and Lp = 48 μm at λ = 1300 nm. In the third case, using AlGaAs 3.0238 in QD 3 nm height, confinement was 0.345, 0.370 for Γ-confinement and 85.110 for FoM, while Lp was 68 µm and 70 µm for wavelengths of 1300 nm and 1550 nm.