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Publications (33)
This paper proposes an ultra-narrow band singlemode metamaterial perfect absorber consisting of periodic square graphene split rings and gold (Au) strips at the top layer, an insulator interlayer of SiO<sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub>, and an Au base layer. The absorber designed...
![Fig. 1. EM spectrum showing different band ranges [76].](publication/386434660/figure/fig1/AS:11431281299943478@1735146263414/EM-spectrum-showing-different-band-ranges-76_Q320.jpg)
Optical sensors are among the most significant optical devices that have found extensive applications for THz sensing. Surface plasmon-based sensors have attracted increasing attention more than other kinds of optical sensors such as photonic crystal, optical fiber, and graphene sensors, owing to their compact footprint, fast reaction, and high sen...
This paper presents the design and numerical investigation of a novel, tunable, and highly efficient metal–insulator-metal (MIM) plasmonic device specifically designed for near-infrared (NIR) applications. The device leverages strategically placed stub resonators within a MIM waveguide. We introduce two small perturbations, a triangle and a rectang...
This paper reports the design and numerical results of three new extremely compact and efficient flat-top band-pass plasmonic filters operating in the near-infrared region. The proposed structures are realized in metal–insulator-metal plasmonic waveguides based on stub, tilted T-junction and right-angle trapezoid configurations. A built-in paramete...
This paper presents the design and numerical investigation of tunable, ultra-compact, and highly-efficient plasmonic filters based on stepped impedance resonators (SIRs). The proposed devices are realized in metal–insulator-metal (MIM) plasmonic waveguide systems and exhibit more degrees of freedom and high flexibility to design resonator-based dev...
THz Plasmonic metasurfaces (TPMs) sensor have emerged as a benchmark principle for harnessing and manipulating light at the nano-scale and enabling to use in optical functionalities for detection of different analytes in liquid and solid phases. Plasmonic sensors with very high sensitivity and precision are particularly important to the fields of c...
This paper presents design and numerical investigations of an ultra-compact, and highly-efficient plasmonic absorber based on metal–insulator–metal waveguides. The proposed device offers multiple narrow-band absorption at visible and near-infrared wavelengths with peak absorbance between 81 and 100%. The finite element method has been used to simul...
As regards optical switches can be suitable candidates for optical sensing applications, this chapter focuses on optical switch devices for optical sensing applications. The optical structures studied are photonic crystal, plasmonic, and graphene structures which are good platforms for the realization of optical devices such as optical switches and...
Plasmon-induced transparency (PIT) in the transparent window provides new insights into the design of optical devices such as optical sensors. Therefore, in this paper, four novel structures based on the PIT phenomenon are proposed to design plasmonic refractive index sensors (RISs). The designed structures consist of metal–insulator-metal (MIM) wa...
One of the most interesting topics in bio-optics is measuring the refractive index of tissues. Accordingly, two novel optical biosensor configurations for cancer cell detections have been proposed in this paper. These structures are composed of one-dimensional photonic crystal (PC) lattices coupled to two metal–insulator–metal (MIM) plasmonic waveg...
In this paper, an all-optical plasmonic modulator is proposed. The structure consists of an InGaAsP nano-disk resonator, surrounded by a Si ring-shaped resonator which is located inside a circular cavity, and two perpendicular metal–insulator-metal plasmonic waveguides. The structure also contains a graded stub filter to separate the control signal...
Three novel refractive index (RI) sensors based on one, two, and three H-shaped cavities (HCs) and metal–insulator–metal (MIM) waveguides are proposed in this paper. By coupling more than one HC (two and three), the Q-factor and then the FOM value of the designed RI sensors increase. A well-known method for increasing the sharpness transition betwe...
![Field profile of Hz\documentclass[12pt]{minimal} \usepackage{amsmath}...](publication/352900757/figure/fig3/AS:1040994732621826@1625203893647/Field-profile-of-Hzdocumentclass12ptminimal-usepackageamsmath_Q320.jpg)
Reconfigurable and scalable plasmonics demultiplexers have attracted increasing attention due to its potential applications in the nanophotonics. Therefore, here, a novel method to design compact plasmonic wavelength demultiplexers (DEMUXes) is proposed. The designed structures (two, four, and six-channel DEMUXes) consist of symmetrical rectangular...
In this paper, an elliptical resonator coupled to a straight metal-insulator-metal waveguide through a silicon layer is used for sensing application. The finite-difference time-domain method is used for the numerical investigation of the proposed structure. Such a structure demonstrates a multi resonance mode in the transmission spectrum. Based on...
In this paper, all-optical plasmonic switches are proposed and analyzed. These structures consist of a rectangular resonator filled with a Kerr-type material (AuSiO2) which is coupled to isolated metal–insulator–metal plasmonic waveguides. The resonators contain periodic arrays of nano-rods with rectangular and triangular patterns. The horizontal a...
In this paper, a novel all-optical plasmonic switch is presented. For the proposed structure, a nano-disk resonator coupled to parenthesis-shaped adjunctions and perpendicular metal–insulator–metal waveguides are used. The insulator which is used here, is an optically nonlinear Kerr-type material (InGaAsP). The data and control pulses are injected...
In this paper, a novel technique for realization of all-optical plasmonic switches is presented. The proposed structure is based on an asymmetric metal-insulator-metal plasmonic directional coupler. A Bragg grating is used on one of the directional coupler’s adjacent waveguides while the other remains intact. Such a modification results in dissimil...
A novel hybrid all-optical infrared switch based on metal-insulator-metal plasmonic and one dimensional photonic crystal structures is introduced in this paper. A photonic crystal lattice composed of two different (low and high refractive index) Kerr materials is located at the center of the switch. Two plasmonic metal-insulator-metal waveguides ar...
In this paper, a plasmonic all-optical switch based on a novel topology is presented. The structure is composed of a rectangular cavity coupled with two cross waveguides. Several silver strips with a tapered pattern are inserted in the rectangular cavity to create a sharp edge in the transmission spectrum of data signal. The cavity and waveguides a...
In this paper, all-optical switches using a novel combination of graphene and insulator-metal plasmonic waveguides are proposed. For the proposed switches the optical Kerr effect is used to change the chemical potential of graphene-based plasmonic waveguides which are located in arms of a Mach-Zehnder interferometer. The phase mismatch induced due...
In this paper, a microstrip dual-band bandpass filter (DBBPF) based on an octagonal loop resonator (OLR), tapered resonators and open bended stubs (OBSs) is designed and analysed. The proposed structure produces two passbands with the centre frequencies of 3.65 and 5.67 GHz. The marked advantages of the proposed filter are as follows: Two centre fr...
A compact plasmonic bandpass filter based on metal–insulator–metal plasmonic waveguides and a coupled U‐shaped cavity is proposed in this study. Air and silver are used as insulator and metal materials and silver is characterised by the Drude model in the simulations. By tuning the height of the designed cavity, it is found that the resonance wavel...
In this paper, first a square-shaped plasmonic cavity (SSPC), which is laterally coupled to two metal-insulator-metal (MIM)waveguides, is used to create a single-mode plasmonic bandpass filter. Thereafter, we try to modify the SSPC topology so that the resonance wavelength (λ r )of the filter be transferred to higher wavelengths (without increasing...
In this paper, a plasmonic filter based on metal-insulator-metal (MIM) configuration is proposed. It uses a hexagonal nano-resonator (HNR) coupled to multi-stub waveguides (MSWs) from both sides. The metal and insulator of the proposed plasmonic filter are silver and air, respectively. Finite difference time domain (FDTD) method is used for numeric...
A novel microstrip dual-band bandpass filter (BPF) with bended microstrip lines, rectangular resonators and stepped impedance resonator (SIR) is designed, analyzed and fabricated. This circuit provides two pass-bands with the center frequencies of 3.6 and 5.7 GHz. Moreover, the LC equivalent circuits of the basic and main resonators are meticulousl...
Plasmonic demultiplexers using improved circular nanodisk resonators (CNRs) and metal-insulator-metal waveguides have been designed. The proposed structures use air and silver as insulator and metal layers, respectively. The relative permittivity of silver has been characterized by Drude, Palik, and Drude-Lorentz models in our finite-difference tim...
In this paper, symmetric and asymmetric plasmonic bandpass filter (BPF) topologies based on the metal–insulator–metal (MIM) configuration are proposed. These filters are numerically investigated using finite difference time domain (FDTD) method. The metal and dielectric used for the realization of the filters are silver and air, respectively. The r...
By exploiting bended microstrip lines and tapered resonators, a new microstrip dual‐band bandpass filter (DBBPF) with tunable center frequency and compact size is proposed, analyzed, and fabricated. The LC equivalent circuit of the basic resonator is introduced to present an analytical description. The proposed filter has two passbands at the cente...
In this letter, a compact dual-band bandpass filter (BPF) is designed, analyzed, and fabricated. A loop resonator loaded by two modified T-shaped resonators, double T-shaped resonators, and open bended stubs are applied to form the proposed configuration. The coupling spaces between the loop resonators and open bended stubs result in two passbands...
A novel microstrip lowpass filter (LPF) composed of high impedance transmission lines loaded by radial split-ring resonators and radial patch resonators is compact in size and exhibits a wide stopband, sharp roll-off and low insertion loss. The demonstrated filter has a-3 dB cutoff frequency offc = 1.77 GHz with a roll-off rate of 121.4 dB/GHz. Its...
