An Efficient Coupling Scheme Between Photonic Crystal Waveguides and Plasmonic Metal-Insulator-Metal Waveguides

In this study, an efficient bi-directional optical coupler has been proposed. Our approach involves the development of a novel mechanism aimed at coupling a plasmonic waveguide to a photonic crystal waveguide. The innovative design of the small-scale plasmonic-photonic crystal-plasmonic coupler (PW-PC-PW) facilitates optimal power transmission between these interconnected waveguides. To conduct comprehensive simulations of the plasmonic-photonic crystal-plasmonic waveguides, we employ the finite difference time domain (FDTD) method. By establishing a coupling between the photonic crystal and plasmonic structures, we achieve efficient signal transfer, thereby laying the foundation for the creation of diverse devices that amalgamate the advantages offered by plasmonic devices and photonic crystals. Consequently, the device outlined in this paper holds substantial promise as a pivotal component for various types of optical integrated circuit devices. The electromagnetic waves operating within this structure fall within the wavelength range of 1500 to 2050 nm, and the achieved transmittance value at a wavelength of λ = 1550 nm reaches an impressive 95