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Articles by Abbas Zarifkar
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.
Simultaneous all-optical sampling and quantization scheme based on the nonlinear Kerr effect in an ultra-compact silicon waveguide grating structure
Abstract In this paper, a novel method for simultaneous all-optical sampling and quantization is presented, to the best of our knowledge. This study utilizes the nonlinear Kerr effect in a silicon-based waveguide grating to realize nonlinear filters in which the sampling pulses are affected by the input signal.
Compact, broadband, and low-loss multimode optical switch based on phase-change material for mode division multiplexing systems
Abstract Mode-division multiplexing (MDM) technology is one of the suitable approaches to increase data transmission capacity in photonic integrated circuits. Multimode optical switches play an important role in MDM interconnection networks.
Ultracompact temporal integrator using graphene-based long-range hybrid plasmonic waveguides
Abstract A microdisk-resonator add–drop temporal integrator, composed of a long-range hybrid plasmonic waveguide, with graphene as the central layer, is proposed for the first time, to the best of our knowledge. The integrator benefits from a considerable integration time of ${\sim}5.55\; {\rm ps}$, which is about 11 times longer than our previously proposed plasmonic integrator, and also is fairly comparable with the integration time of a microring-based integrator with a ring radius of 47.5 µm.
Compact, high-performance, and fabrication friendly two-mode division multiplexer based on a silicon bent directional coupler
Abstract In response to the increasing demands of the capacity enhancement of optical communication, a compact and high-performance silicon mode division multiplexer is proposed that multiplexes the fundamental and first-order transverse magnetic modes. The device structure is based on an asymmetric bent directional coupler with an ultrasmall coupling length of 3.67 µm.
Ultracompact and ultrabroadband mode division multiplexer based on an Au nanocube array assisted directional coupler
Abstract An ultracompact and ultrabroadband two-mode (de)multiplexer based on an asymmetric directional coupler for mode division multiplexing is proposed. The device structure consists of a pair of silicon waveguides with an array of plasmonic Au nanocubes sandwiched in the coupling region. The coupling region length of the directional coupler is decreased to 1 µm for coupling of the fundamental transverse magnetic (TM) mode to the first order mode by excitation of the surface plasmon polaritons.
Compact and broadband 2 × 2 optical switch based on hybrid plasmonic waveguides and curved directional couplers
Abstract In this paper, a compact, broadband, and CMOS compatible ${2} \times {2}$ optical switch based on hybrid plasmonic waveguides (HPWs) and curved directional coupler is presented. The proposed coupler consists of a combination of straight and curved hybrid plasmonic waveguides.
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.
Compact and broadband data exchange for mode-division-multiplexed networks
Abstract Recently, mode-division multiplexing (MDM) technology has been used to enable high-bandwidth data transmission. Information swapping or data exchange is an essential function in such high-capacity networks. This paper presents a small, broadband on-chip optical data exchange between two multiplexed modes on the silicon-on-insulator platform.
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.
Design of ultracompact tunable fractional-order temporal differentiators based on hybrid-plasmonic phase-shifted Bragg gratings
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