الفهرس 
Chapter 1Only 14 pages are availabe for public view
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Abstract
In terms of both data transmission rate and speed, electronics, and semiconductor integrated circuit technologies are speedily moving closer to their fundamental limits. Using light rather than electrons in the functional processing components is one of the up-and-coming solutions to these issues. But, when photonic devices’ dimensions are less than the wavelength of light inside the material, it results in a phenomenon called “light diffraction limit” which limits the fabrication process of nanoscale photonic devices. Surface Plasmon Polaritons (SPPs), electromagnetic waves, and charge oscillation are both coupled to each other at the metal / dielectric interface, which can overcome the problem which was caused by the diffraction limit and carry out electromagnetic energy localization in these nanoscale regions. The metal / dielectric interface has a normal electromagnetic field with long-range propagation along this interface but decays exponentially when moving away from it. This essential property of SPPs, which allows them to carry and propagate both signals (electrical or optical), makes them a suitable basis for the design of photonic integrated circuits (PICs) in the next generation. Metal-Insulator-Metal (MIM) and Insulator-Metal-Insulator (IMI) structures are two classic kinds of the plasmonic waveguide. The MIM structure is suitable and attractive for on-chip integration into PICs due to its strong light confinement with significant propagation and ease of implementation with recent fabrication technologies such as focused ion beam, lithography, etching, and template methods. Based on the aforementioned features, a collection of plasmonic waveguides based on the MIM structure has been proposed and established, such as filters, sensors, absorbers, and more. In this thesis, two plasmonic filters are designed, modeled, and simulated using COMSOL Multiphysics software package. A comparative analysis between these two designed plasmonic filters and the previous verified work is also shown.For the first design, a highly efficient compact tunable optical notch filter is proposed and analyzed using the 2D Finite Element Method (FEM). The proposed structure consists of a slanted stub plasmonic resonator, MIM waveguide, and InGaAsP as a third-order nonlinear optical material. The suggested notch filter can remove four narrow bands of wavelengths, each around 50 nm wide, and a transmission of about -17 dB. By altering the pumping state of the InGaAsP, the filtered wavelengths may be easily controlled continuously over 200 nm a range. The proposed filter’s key advantages are its high transmission coefficient and fabrication simplicity with compact size. For future integrated plasmonic devices such as outdoor visible light communications and biomedical optical imaging, the proposed filter can be manufactured using an oblique angle shadow evaporation technique.The second filter design is a new design for a tunable multi-channel plasmonic bandpass filter that is numerically investigated using the two-dimensional finite element method (2D-FEM). The proposed multi-channel plasmonic bandpass filter consists of a MIM-WG and double-sided arrow-shaped cavities. Silver (Ag) and a nonlinear optical medium (InGaAsP) are used in the designed filter. InGaAsP fills the bus waveguide and arrow-shaped cavities. The refractive index of InGaAsP is sensitive to the incident light intensity, therefore the resonance wavelengths can be controlled. Utilizing different incident light intensities (such as 1017 V2/m2 and 2 × 1017 V2/m2) on the InGaAsP, the filter wavelengths is tuned over a range from 600 nm to 1200 nm. The proposed filter with a confinement area of 0.5 μm2 can be used in wavelength division multiplexing (WDM), photonic systems, coloring filters, sensing, and 5G+ communication.