Selim Hossain, Rokeya Mumtahana Mou, Mohammed Mahedi Hasan, Sajib Chakraborty et al.
Tea is a popular beverage all around the world, and in Bangladesh the cultivation of tea plays a vital role. Many diseases affect the proper growth of tea leaves leading to its reduction, thus hindering of the production of tea. However, if the disease is identified at an early age it would solve al...
Monir Morshed, Md. Imran Hassan, Tushar Kanti Roy, Muhammad Shahin Uddin et al.
In this paper, a highly sensitive gas sensor based on the microstructure core and cladding photonic crystal fiber (PCF) is presented over the wavelength range from 1.3 to 2.2 μm, which is advantageous for sensor fabrication. The guiding properties of the proposed structure are dependent o...
Md. Selim Habib, Md. Samiul Habib, S. M. Abdur Razzak, Md. Anwar Hossain
Md. Imran Hasan, Md. Selim Habib, Md. Samiul Habib, S. M. Abdur Razzak
Md. Rabiul Hasan, Md. Shamim Anower, Md. Ashraful Islam, S. M. Abdur Razzak
A polarization-maintaining porous-core spiral photonic crystal fiber is proposed for efficient transmission of polarization-maintaining terahertz (THz) waves. The finite element method with perfectly matched layer boundary conditions is used to characterize the guiding properties. We demonstrate tha...
G. K. M. Hasanuzzaman, Md. Selim Habib, S. M. Abdur Razzak, Md. Anwar Hossain et al.
A novel porous-core kagome lattice photonic crystal fiber (PCF) is designed and analyzed in this paper for terahertz (THz) wave guidance. Using finite element method (FEM), properties of the proposed kagome lattice PCF are simulated in details including the effective material loss (EML), confinement...
Md. Imran Hasan, S. M. Abdur Razzak, G. K. M. Hasanuzzaman, Md. Samiul Habib
This letter reports a photonic crystal fiber having ultralow material loss and near-zero dispersion at the telecom window which is suitable for THz wave guidance. The finite element method with perfectly matched layer circular boundary is used to investigate the guiding properties. The numerical res...
Alok Kumar Paul, Md. Samiul Habib, Nguyen Hoang Hai, S. M. Abdur Razzak
Most surface plasmon resonance (SPR) based photonic crystal fiber (PCF) sensors have been designed to detect the analyte refractive index (RI) ranging from 1.33 to 1.41. In this paper, we propose a new approach to extend the detection range of the sensor, and it can be fabricated with the existing f...
Md. Rabiul Hasan, Md. Ashraful Islam, Md. Shamim Anower, S. M. Abdur Razzak
A novel porous-core photonic crystal fiber is presented, and its guiding properties are numerically investigated by using the finite element method. It is demonstrated that by introducing a rhombic-shaped core made of circular air holes inside the conventional hexagonal cladding, it is possible to o...
Md. Imran Hasan, S. M. Abdur Razzak, Md. Samiul Habib
A residual dispersion compensating octagonal photonic crystal fiber (OPCF), with an elliptical array of circular air-holes in the fiber core region, is proposed. The full-vector finite-element method with perfectly matched layer boundary is used as the analysis tool. It is demonstrated that it is po...
Michael Frei, Muhammad Abdur Razzak, Md Moazzem Hossain, Maike Oehme et al.
Lowland rice fields constitute a semi aquatic environment, which is potentially suitable for fish production. Little is known about the effect of fish on greenhouse gas emissions from integrated rice-fish systems. An experiment was carried out at the Bangladesh Agricultural University to assess the ...
Michael Frei, Muhammad Abdur Razzak, Md Moazzem Hossain, Maike Oehme et al.
Irrigated rice fields have enormous potential for expanding the aquaculture production in rice producing countries. Two field experiments were carried out at the Bangladesh Agricultural University, Mymensingh, to optimize the productivity of integrated rice-fish systems using Nile tilapia, Oreochrom...
Md. Aslam Mollah, S. M. Abdur Razzak, Alok Kumar Paul, Md. Rabiul Hasan
This work proposes a highly sensitive plasmonic sensing scheme on a simple circular lattice microstructure optical fiber (MOF) structure. The proposed sensor performance is evaluated by using the finite element method (FEM) in the presence of perfectly matched layer (PML) and scattering boundary con...
Md. Rabiul Hasan, Md. Shamim Anower, Md. Imran Hasan, S. M. Abdur Razzak
A polarization maintaining ultra-low effective material loss based on slotted core kagome lattice fiber is proposed for terahertz (THz) wave propagation. Numerical study demonstrates that by using rectangular slotted air holes in the core of the kagome lattice exhibits simultaneously an ultra-high b...
Md. Imran Hasan, Md. Samiul Habib, Md. Selim Habib, S. M. Abdur Razzak
A highly birefringent dispersion compensating hybrid photonic crystal fiber is presented. This fiber successfully compensates the chromatic dispersion of standard single mode fiber over E- to L-communication bands. Simulation results reveal that it is possible to obtain a large negative dispersion c...
Md. Farhan Israk, Md. Abdur Razzak, Kawsar Ahmed, Md. Mehedi Hassan et al.
A unique, spectacular design of Photonic Crystal Fiber (PCF) is discussed in this paper to introduce one of the highest numbers of Orbital Angular Momentum (OAM) modes for the very first time with a very large bandwidth of 1,900 nm. Three layers of convoluted coiled structure air cavities formed the...
Mir Golam Rabby, Abdur Razzak, Md. Mamun Molla
In this research, we numerically investigate the physics of a pulsatile non-Newtonian flow confined within a two-dimensional (2D) axisymmetric pipe with an idealized stenosis using the finite volume method. The governing Navier-Stokes equations have been modified using the Cartesian curvilinear coor...
Md. Abdur Razzak, Md. Asaduzzaman, Hideyuki Tanaka, Toshiki Asao
Monir Morshed, Md. Imran Hasan, S. M. Abdur Razzak
This paper proposes the design and characterization of microstructure optical fiber for gas sensing applications. The aim is to detect toxic and colorless gases over a wide transmission band covering 0.80 µm to 2.00 µm wavelength. Numerical investigation is carried out by using the finite element me...
Tanvir Ahmed, Alok Kumar Paul, Md. Shamim Anower, S. M. Abdur Razzak
In this paper, the guiding properties and sensor performance are numerically investigated for a dual-core hexagonal lattice photonic crystal fiber sensor based on surface plasmon resonance (SPR). Gold is used as the active plasmonic material in order to create resonance, and it is placed outside the...