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    Analysis and Simulation of Micrometre-scale Silicon Electro-optic Modulators Based on Ring Resonators

    , M.Sc. Thesis Sharif University of Technology Jafari, Omid (Author) ; Akbari, Mahmood (Supervisor)

    Modeling and Dynamic Analysis of Anti-Lock Braking System Modulator

    , M.Sc. Thesis Sharif University of Technology Shafiei, Mohammad Javad (Author) ; Behzad, Mahdi (Supervisor)
    Abstract
    Anti-lock brakes car as one of the most fundamental and vehicle stability control system is considered. Solenoid valves, one-way valves, Accumulator, damper orifices and other components is a crucial role in the anti-lock system performance, so that the performance of the system and thus affect the dynamic performance of the vehicle. This is the most important part of the anti-lock brake System and These components are all new brake system.In this study a complete modeling of hydraulic control unit and obtain sufficient data to model the dynamic behavior of the hydraulic control unit to be seen. operators working in higher frequencies are weak and virtually reached saturation and efficient... 

    Investigation and Analysis of the Effect of Graphene on the Extraordinary Transmission of Light using Circuit Model

    , M.Sc. Thesis Sharif University of Technology Motavassel, Ahmad (Author) ; Khavasi, Amin (Supervisor)
    Abstract
    Subwavelength metallic slit structures allow extraordinary transmission of light (EOT) at certein frequencies.In recent years, the effect of graphene layer on EOT has been investigated, which is used in the design of terahertz modulators. The electrostatic tuning ability of graphene electrical conductivity controls the resonance frequency and the amount of incident radiation absorption. Because of the single atomic thickness of graphene, the wide range control of incident light can not be achieved alone. However, by placing this layer with various 1-D and 2-D patterns on periodic metallic layers with EOT ability, high light modulations can be obtained. In particular, the structure of the... 

    Analysis and Design of a Graphene-based Plasmonic Modulator

    , Ph.D. Dissertation Sharif University of Technology Ghahri, Mohammad Reza (Author) ; Faez, Rahim (Supervisor)
    Abstract
    In this study, we simulated and analyzed a plasmonic waveguide modulator based on single layer graphene. It includes a graphene sheet, which sandwiches between two layers of silicon dioxide. Then, some gates are arranged on either side of the waveguide on a periodic structure. When an electric field is applied perpendicular to the waveguide plate, the Fermi level of graphene under the gates, changes. Detailed analysis is performed by the method of lines based on Maxwell's equations along the propagation direction of the waveguide. Computation of the multi-gate device starts by examining the effect of Fermi level. Transmission coefficient of the magnetic-field norms of the modulator is...