Abdul Khaleque

Abdul Khaleque
Rajshahi University of Engineering & Technology · Department of Electrical and Electronic Engineering

PhD

About

60
Publications
7,777
Reads
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585
Citations
Introduction
Dr. Abdul Khaleque is currently working as a Professor in the Department of EEE, RUET, Bangladesh. He received his PhD degree in electrical engineering (EE) from the University of New South Wales, Australia in 2017. His research interest includes Photonics: Advanced optical fibers (PCF, HCF, HC-ARF), Plasmonics and optical devices, Nano-antennas and integrated devices, graphene and related devices, optical modulator, and fiber laser.
Additional affiliations
March 2013 - present
Rajshahi University of Engineering & Technology
Position
  • Research Assistant
Description
  • I am doing PhD in UNSW, Canberra. Research Topics: Surface Plasmonic Devices
March 2013 - March 2016
UNSW Sydney
Position
  • Postgraduate Research Student
June 2008 - February 2013
Rajshahi University of Engineering & Technology
Position
  • Research Assistant

Publications

Publications (60)
Article
This paper reveals a THz leading nodeless antiresonant slotted hollow core fiber (NARS-HCF) with low transmission loss and broad band flat near zero dispersion. We have achieved better results in a simpler structure as far as we know: a minimal confinement loss in the order of around 10−4 dBm−1 and a very low effective material loss of 0.0248 dBm−1...
Article
We present a compact polarization splitter on a dual hollow-core antiresonant fiber with broad bandwidth covering two well-known communication wavelengths of 1.31 µm and 1.55 µm. It can achieve excellent polarization splitting performances in a simpler optimized single-layer geometry compared to the related splitters and for the first time, simulta...
Conference Paper
In this paper, a proposal on highly birefringent and low losses hollow core antiresonant fiber is presented and analyzed, capable of exhibiting better performances than the recent related achievements. The addition of high index layers and elliptical nesting on our optimized structure improved the birefringence by nearly one order: highest value is...
Conference Paper
In this paper, we proposed a hollow core antiresonant fiber, having conjoined tube cladding elements with additional negative curvature layer which presents hybrid configuration, offers very stunning performance among related fibers. The proposed hybrid conjoined tube fiber exhibits a lowest loss of 3.0×10 −6 dB/m at 1430 nm by keeping a loss of ~...
Conference Paper
In this paper, an antiresonant hollow core fiber, having a triple cladding arrangement, is presented. The addition of a third cladding ring in an optimized geometry leads to three orders of loss reduction compared to the double cladding ring fibers resulting in lowest leakage loss of 5.82×10 −5 dB/km at 1.06 μm wavelength. The fiber also exhibits a...
Article
In this article, an antiresonant nodeless hollow core fiber having nested hybrid cladding elements is proposed without having large distance between core and jacket capillary. The presented anisotropic construction (elliptical nesting in circular tube) with optimized curvature factor, strut thickness, and gap between adjacent tubes lead to extremel...
Article
In this article, we consistently elucidate the impacts of cladding geometries on conjoined tube hollow-core negative curvature fibers and offers a modified conjoined tube negative curvature fiber with appropriate positioning of additional negative curvature D shaped layer joining with the flat bar able to reveal attractive performances over existin...
Conference Paper
This paper demonstrates a hollow-core anti-resonant fiber containing double cladding rings with nested elements which can reduce the leakage loss by about five orders of magnitude. The results show ultra-low leakage loss of 1.0×10−3 dB/km at 1400 nm wavelength and able to maintain the leakage loss lower than 0.10 dB/km over wide bandwidth (around 3...
Conference Paper
This paper proposed a hollow core (HC) antiresonant fiber (ARF) with anisotropic nested elliptical elements inserted into the outer circular antiresonant tubes. The additional uneven nested elements with the proper choice of designing parameters have reduced the loss by more than four order. The numerical calculation exhibits notably lower loss ove...
Article
Full-text available
In this paper, a highly sensitive temperature sensor is proposed on the platform of photonic crystal fiber (filled with ethanol) and Sagnac interferometer. The sensing characteristics of the device are analyzed by the finite element method. The results show a high temperature sensitivity of 23.23 nm/°C and − 8.71 nm/°C for the fiber length of 24 cm...
Article
Full-text available
A photonic crystal fiber based highly sensitive sensing mechanism is proposed, in the terahertz frequency band, able to detect a wide range of analytes, such as toxic or non-toxic chemicals and illicit drugs. The proper optimization of the PCF structure increases the light-matter interaction in the core, which results in a high relative sensitivity...
Article
Full-text available
A double cladding nested antiresonant hollow core fiber is reported in this article. We demonstrated that the addition of nested elements in the second cladding ring and the proper optimization of structural parameters lead to the loss reduction by more than five orders. The numerical simulation exhibits a loss of less than ∼ 0.1 dB/km over the O,...
Article
A compact polarization beam splitter based on a gold-filled photonic crystal fiber with a square lattice is proposed. The full vector finite element method is used to design and characterize the proposed ultra-compact and ultra-broadband polarization splitter. The plasmonic plays an important role in order to achieve an ultra-short length of 56.33...
Conference Paper
This paper presents a biosensor based on photonic crystal fiber and surface plasmon resonance. The plasmonic metal and the sample are placed outside the fiber to enhance the sensitivity. The presented biosensor numerically exhibits the maximum wavelength sensitivity of 19,000 nm/RIU and 7000 nm/RIU for y- and x- polarization, respectively. In addit...
Article
Full-text available
A numerical analysis on dual core photonic crystal fiber (DC-PCF) based surface plasmon resonance (SPR) refractive index sensor is presented. The guiding parameters and required sensing performances are examined with finite element method (FEM) based software under MATLAB environment. According to simulation, it is warrant that the proposed refract...
Conference Paper
Bow-tie nano-antennas are the kind of plasmonic structures that are widely used in optical applications to obtain strong electric fields in a limited volume. Their capability to enhance the incident light can be greatly improved by constructing these structures from several alternating metal/dielectric layers. Following this approach, we introduce...
Article
Full-text available
This paper analyzes a multi-layered bowtie nano-antenna, consisting of alternate layers of silica (SiO2) and gold (Au). We show that the multi-layered structure can produce six times higher elec-tric field enhancement than a purely gold bowtie antenna. The antennas may find applications insensing (e.g., Surface Enhanced Raman Scattering) and imagin...
Article
Full-text available
In this article, a new and flexible approach to control the electric field enhancement of bow-tie nano-antennas by integrating them on the lateral of a tapered optical fiber is proposed. The device is driven by a Q-switched laser and the performance of a fabricated nano-antenna in a quartz slide is tested by a Surface Enhanced Raman Scattering (SER...
Article
Full-text available
Silicon photonics has begun to use index tunable plasmonic materials, such as graphene and indium tin oxide (ITO), because these materials can have their properties tailored by an external voltage. In this article, a compact plasmonic device, which can work as an optical mode controller and electro-absorption (EA) modulator at 1550 nm, is proposed....
Article
Manganese dioxide (MnO<sub>2</sub>) is an abundant material that is widely used in many devices, such as alkaline batteries. At infrared frequencies, MnO<sub>2</sub> is lossy and strongly absorbs light. These characteristics make MnO<sub>2</sub> a potential candidate as a low-cost saturable absorber in Q-switched lasers. In this paper, we examine t...
Conference Paper
A hybrid Q-switched ring laser combining tungsten disulfide (WS 2 ) nano-particles and an in-fiber acousto-optical modulator is constructed. Pulses ranging from 35 ns to 8 μs are obtained with this laser.
Conference Paper
We analyze a multi-layered nano-antenna made of alternating layers of silica and gold. We show that a multi-layered structure can produce higher (two times) electric field enhancement than a pure gold antenna.
Article
Full-text available
Q-switched lasers are widely used in material processing, laser ranging, medicine, and nonlinear optics-in particular, Q-switched lasers in optical fibers are important since they cannot only generate high peak powers but can also concentrate high peak powers in small areas. In this paper, we present new finite-difference time-domain methods that a...
Article
Graphene, a single layer of carbon atoms arranged in a honeycomb lattice, is attracting significant interest because of its potential applications in electronic and optoelectronic devices. Although graphene exhibits almost uniform absorption within a large wavelength range, its interaction with light is weak. In this paper, the enhancement of the o...
Article
Nano-antennas are the optical equivalent of antennas that are used to transmit and receive information at radio frequencies. These antennas have been used in different applications in photonics such as optical imaging, particle manipulation, bio-sensing, and improvement of the performance of solar cells. In this article we study composite nano-ante...
Conference Paper
Full-text available
The enhancement in absorption of photonic graphene structure is reported in this article: it can be enhanced about four times (40%) compared to a reference absorption (9.8%) at certain wavelengths by adding defects and mirrors.
Conference Paper
A composite graphene-silica grating structure based upon a pseudo-noise function is proposed and analysed - it is shown that the properties of the compound grating can be tailored by applying an external voltage to graphene.
Conference Paper
Full-text available
A polarization splitter based on a gold filled photonic crystal fiber (PCF) is reported in this article: it can work from 1420 nm to 1980 nm with 254.6 μm length, covering communications and sensing applications.
Article
Full-text available
In this work, the main properties of a dual-core plasmonic photonic crystal fiber that can split an incoming signal into two orthogonal polarization states are analyzed by using finite element method. The proposed splitter has a short length of 117 μm, being capable of splitting an incoming wave into two orthogonal states in the wavelength range be...
Article
Full-text available
A polarization splitter based on gold filled dual-core photonic crystal fiber (DC-PCF) that can work from 1420 nm to 1980 nm (560 nm bandwidth) is proposed in this work. The splitter has an extinction ratio lower than -20 dB over a large bandwidth with a total length of 254.6 μm. The key principle of operation of the splitter is the induced change...
Conference Paper
Full-text available
We investigate the electric field enhancement in multilayered dipole nano-antenna and show that the combination of Au/SiO 2 layers taken at a 50% filling factor can produce extremely high field enhancements in the order of 17.9.
Article
Full-text available
In this article, a polarizer based on surface plasmon resonance in a squeezed rectangular lattice is analyzed through a full-vector finite-element method solver. The device allows one state of polarization (e.g., y-polarized mode) to propagate through the fiber while the other state (x-polarized mode) is heavily attenuated: the modal losses for the...
Article
Full-text available
Graphene is a two-dimensional material with outstanding properties such as high electronic and thermal conductivities that may bring a revolution in the miniaturization of electronic and optical circuits. In this letter, we analyze a tunable grating structure that combines a graphene grating and a vertical silica grating based upon a pseudonoise fu...
Article
Full-text available
This article studies the propagation of light in asymmetric Cantor set fractal multi-layered structures. We show that well designed Cantor set structures can lead to broadband high reflectivity over a large wavelength range but, by adding asymmetries to the Cantor set, it is possible to control the reflectivity from 100% to nearly 0%.
Article
Full-text available
Some microobjects can concentrate an incoming incident plane wave and produce the socalled photonic nanojets. The highly focused emerging beams have a high intensity and can be used in applications in microscopy, beam manipulation and imaging. In this article, it is shown that an adequate choice of geometric shape and material can lead to an improv...
Conference Paper
Full-text available
We show that the addition of chromium to a graphene oxide Q-switched laser leads to a reduction in the duration of the pulses from 9.4 μs to 3.5 μs.
Article
Full-text available
In recent years, graphene and its compounds (e.g., oxides) have been used as saturable absorbers in passive Q-switched and mode-locked lasers, leading to the fabrication of compact pulsed fiber lasers. In this article, we study the operation of a Q-switched ytterbium-doped fiber ring laser based on a composite saturable absorber made of graphene ox...
Conference Paper
In this paper, it is shown that the electric field enhancement factor of plasmonic nanojets can be dynamically controlled by the application of an external intense magnetic flux density.
Article
Full-text available
In recent years, many researchers have studied photonic nanojets. These nanojets are created when an incident plane wave is focused into a narrow and high intensity emerging optical beam leaving a micro-object (e.g. microcylinder). These narrow beams may find applications in particle imaging and detection, optical sensors, enhanced Raman scattering...
Conference Paper
Full-text available
This paper presents a simple, low cost compact microstrip antenna, which works in triple frequency band. This compact microstrip antenna realized by changing the geometric shape, obtained by inserting a vertical slot. The simulation has been performed by simulation software GEMS version 7.71.01 and using Taconic TLY-5 dielectric substrate with rela...
Conference Paper
Full-text available
This paper presents a numerical finite difference time domain (FDTD) analysis of the electromagnetic field (EMF) penetration in structures that represent estimation of human head anatomical tissues, in specific conditions associated to mobile phone technology. Specific absorption rate (SAR) calculations have been carried out for some configurations...
Article
Full-text available
In this paper, the effect of the obstacle in an environment such as building on the electromagnetic wave propagation has been analyzed by MATLAB simulation software for TMz mode. Maxwell’s equations in 3-D are converted into 2D algebraic equations for special condition by Finite Difference Time Domain (FDTD) method with first order MUR absorbing bo...
Article
Full-text available
This paper presents birefringence tailoring of photonic crystal fibers using artificial defects along one of the orthogonal axes. The APSS™ software based on the finite difference method with anisotropic perfectly matched layer boundaries is used as the design tool. According to simulation, it is shown that it is possible to design very high birefr...
Article
Full-text available
The optical signals pass through a number of components such as optical fibers, filters, multiplexers and switches. These components increase the amount of total dispersion. Dispersion or pulse spreading of the optical signals is a problem which limits the bandwidth and length of the information carrying fiber. Therefore, it is important to control...

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Projects

Projects (4)
Project
The objectives and aims of this project are to:  propose new HC-ARFs design for THz application
Project
The objectives and aims of this project are –  To design novel Hollow core Antiresonant fibers
Project
To produce new optical devices on the platform of PCFs, ARFs and others useful for communication as well as THz applications.