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Articles by Mir Hamid Rezaei
Cross-talk-free, high extinction ratio, and ultra-compact all‑optical 4 × 2 encoder using graphene-based plasmonic waveguides - Scientific Reports
Abstract This paper presents an all-optical 4 × 2 encoder based on graphene-plasmonic waveguides for operation in the wavelength range of 8–12 μm. The basic plasmonic waveguide consists of a silicon (Si) strip and a graphene sheet supported by two dielectric ridges. Surface plasmon polaritons (SPPs) are stimulated in the spatial gap between the graphene sheet and the Si strip.
Near-perfect wide-band absorbers based on one-dimensional photonic crystal structures in 1–20 THz frequencies
Abstract This paper investigates the absorption behavior of one-dimensional (1D) photonic crystal (PhC) structures in the 1–20 THz region. The structures are analyzed by the transfer matrix method to achieve accurate results quickly with ordinary simulation facilities. The simulation results indicate a strong dependence of the absorber performance on the thickness and material of the PhC layers, as well as the frequency and angle of incident light.
Ultracompact, high-extinction ratio XOR, OR, and Feynman logic gates based on plasmonic metal-insulator-metal directional couplers
Abstract Three plasmonic logic gates including XOR, OR, and Feynman based on directional couplers operating in the optical communications band are proposed. First, a 3 dB directional coupler based on metal–insulator–metal waveguides is presented and its operation principles are investigated using the coupled mode theory method. Then, XOR and OR logic gates are implemented simultaneously in one structure.
High-extinction ratio and ultra-compact two-bit comparators based on graphene-plasmonic waveguides
Abstract Electro-optical 1-bit and 2-bit comparators based on graphene plasmonic waveguides are proposed. Surface plasmon polaritons are stimulated by radiation of a TM-polarized light with a wavelength of 15 µm and their propagation is controlled by applying electrical signals which represent the binary numbers that need to be compared. The results of comparing two numbers are obtained in the form of light at the output ports.
Dielectric-loaded graphene-based plasmonic multilogic gate using a multimode interference splitter
Abstract In this paper, we propose a multilogic gate (MLG) by utilizing a dielectric-loaded graphene-based plasmonic waveguide (DLGPW) in the mid-infrared spectral region. The proposed MLG is composed of DLGPW-based switches and multimode interference (MMI) splitters and supports three logical operations—AND, XNOR, and NOR—simultaneously.
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