Sujan Chakma, Md. Abdul Khalek, Bikash Kumar Paul, Kawsar Ahmed et al.
The particularly sensitive circular lattice Photonic Crystal Fiber (PCF) based Surface Plasmon Resonance (SPR) sensor is proposed to gain high sensitivity for the detection of unknown analytes. In this model, two-layer PCF based on the SPR has been designed. A plasmonic chemically inactive material ...
Md. Nazmul Hossen, Md. Jannatul Ferdous, Md. Abdul Khalek, Sujan Chakma et al.
A photonic crystal fiber (PCF) biosensor based on surface plasmon resonance (SPR) is to obtain maximum sensitivity for the detection of unknown analytes. Chemically stable and inactive plasmonic material gold (Au) is used outside of the PCF structure. To evaluate the performance of the sensor, a per...
Nurshad Ali, Md. Ashraful Hoque, Abedul Haque, Kazi Abdus Salam et al.
BACKGROUND: Arsenic is a potent pollutant that has caused an environmental catastrophe in certain parts of the world including Bangladesh where millions of people are presently at risk due to drinking water contaminated by arsenic. Chronic arsenic exposure has been scientifically shown as a cause fo...
Bikash Kumar Paul, Md. Golam Moctader, Kawsar Ahmed, Md. Abdul Khalek
A novel design of circular hybrid photonic crystal fiber (CH-PCF) with highly nonlinearity and high numerical aperture (NA) is introduced in this paper. The numerical simulation results are obtained by employing the finite element method (FEM) and selecting finer mesh. The investigated parameters ar...
Bikash Kumar Paul, Md. Abdul Khalek, Sujan Chakma, Kawsar Ahmed
In this article, a new quasi photonic crystal fiber (PCF) with chalcogenide ellipse core has been proposed. Fundamental optical transmission characteristics such as effective area, confinement loss, numerical aperture (NA), nonlinearity and power fraction has been investigated through the full vecto...
Nihad Adnan, Shahad Saif Khandker, Md. Ahsanul Haq, Mousumi Akter Chaity et al.
BACKGROUND: Rapid increase in COVID-19 suspected cases has rendered disease diagnosis challenging, mainly depending upon RT-qPCR. Reliable, rapid, and cost-effective diagnostic assays that complement RT-qPCR should be introduced after thoroughly evaluating their performance upon various disease phas...
Bikash Kumar Paul, Sujan Chakma, Md. Abdul Khalek, Kawsar Ahmed
In this paper, we have proposed a new type of quasi photonic crystal fiber (PCF) with a silicon nano crystal core. This structure can be used to sense aqueous analysis over a wavelength range of 1.00 µm to 3.00 µm. The properties of this structure are simulated using the vector-finite element method...
Sebastian Nielsen, Md. Abdul Khalek, Christine Stabell Benn, Peter Aaby et al.
BACKGROUND: West African studies have suggested that national immunisation campaigns with oral polio vaccine (C-OPV) may non-specifically reduce all-cause child mortality rate by 15-25%. We investigated whether C-OPVs had similar non-specific effects in rural Bangladesh from 2004 to 2019. METHODS: C...
Md. Abdul Khalek, Sujan Chakma, Kawsar Ahmed, Bikash Kumar Paul et al.
Md. Nazmul Hossen, Md. Jannatul Ferdous, Kawsar Ahmed, Md. Abdul Khalek et al.
In this paper, we propose a photonic crystal fiber (PCF) polarization filter based on surface plasmon resonance (SPR) characteristics. Gold nanowire is used as the active plasmonic material. Light into silica core becomes coupled to gold nanowire stimulating SPR. It splits light into two orthogonal ...
S Maheswaran, Bikash Kumar Paul, Md. Abdul Khalek, Sujan Chakma et al.
The article includes the greater effort such as quasi Photonic crystal fiber (PCF) with tellurite elliptical core structure is numerically investigated. The performances of the new form of PCF are inferred by calculating the desired optical parameters. As a whole, the PCF provides a significant effe...
A. T. M. Sakiur Rahman, Mahim Ahmed, Hasnat Mohammad Adnan, Md. Kamruzzaman et al.
Abstract. The objectives of the present study were to explore the changes in the water balance components (WBCs) by co-utilizing the discrete wavelet transform (DWT) and different forms of the Mann–Kendall (MK) test and develop a wavelet denoise autoregressive integrated moving average (WD-ARIMA) mo...
Bipul Biswas, Kawsar Ahmed, Bikash Kumar Paul, Md. Abdul Khalek et al.
In this research paper, a D-shape structure of photonic crystal fiber (PCF) is introduced. Here, prime optical transmission characteristics like as nonlinearity, numerical aperture (NA), effective area, confinement loss are obtained by selecting finer mesh and finite element method (FEM). Gallium ph...
I. S. Amiri, Md. Abdul Khalek, Sujan Chakma, Bikash Kumar Paul et al.
In quasi pattern, photonic crystal fiber (PCF) with Ge20Sb15Se65 rectangular core is modeled. In this article, few optical properties of PCFs like power fraction, nonlinearity, effective mode area, birefringence, beat length, waveguide dispersion are obtained using finite element method (FEM). The p...
Md. Abdul Khalek, Sujan Chakma, Bikash Kumar Paul, Kawsar Ahmed
in the sensing ranges between 1.34 and 1.37. Based on the suggested sensor model may provide great impact in biological area such as bio-imaging.