Browsing by Author "Dhasarathan, Vigneswaran"

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Design and Fem Analysis of Pentagonal Photonic Crystal Fiber for Highly Non-linear Applications
(Optical and Quantum Electronics, Springer, 2020-10-08) Mamtaz, Raisa; Ahmed, Kawsar; Paul, Bikash Kumar; Aktar, Mst. Nargis; Uddin, Muhammad Shahin; Dhasarathan, Vigneswaran; Mollah, Md. Aslam
A Pentagonal Photonic Crystal Fiber (P-PCF) injected with As2S5As2S5 in elliptic core has been propounded by FEM technique. The simulation is carried out by perfectly matched layer using COMSOL Multiphysics software. Several features of the PCF have been analyzed as such nonlinearity, confinement loss, birefringence, effective mode area, power fraction, numerical aperture and dispersion by synthesizing the shape of the cladding holes and the elliptic core. The P-PCF renders a higher nonlinear coefficient of 8000 W−1km−1W−1km−1, numerical aperture of 0.44, power fraction of 84% and lower confinement loss of 10−710−7 at 1.00 μm wavelength. Furthermore, higher birefringence and near zero dispersion are also gained. A perfect geometric fabrication and exclusive properties of chalcogenide glass is used as a core makes the PCF so dynamic in polarization controlling schemes, super continuum systems as well as nonlinear fields.
Design of Ge 20 Sb 15 Se 65 Embedded Rectangular Slotted Quasi Photonic Crystal Fiber for Higher Nonlinearity Applications
(Optik, Elsevier, 2019-05) Amiri, I. S.; Chakma, Sujan; Paul, Bikash Kumar; Ahmed, Kawsar; Dhasarathan, Vigneswaran; Rajan, M.S. Mani
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 proposed structure demonstrates significant effect on few optical properties for two polarization modes. It produces a high nonlinearity of 6.161 × 103 W−1Km−1and birefringence of 1.46 × 10−1 inside infrared region (IR). This proposed structure may play a vital role in multitasking applications.
Design of Magnetic Fluid Sensor Using Elliptically Hole Assisted Photonic Crystal Fiber (PCF)
(Journal of Superconductivity and Novel Magnetism, Springer, 2020-03-16) Mitu, Sumaiya Akhtar; Ahmed, Kawsar; Hossain, Md. Nadim; Paul, Bikash Kumar; Nguyen, Truong Khang; Dhasarathan, Vigneswaran
The magnetic field sensor based on Photonic Crystal Fiber (PCF) is proposed by tuning the structure and magnetic fluid which is injected into the core. The sensitivity and resolution response of the magnetic field sensor under different magnetic field strength has been calculated for the magnetic field strength range from 100 Oe to 160 Oe. The investigated result shows the highest sensitivity response of 5000 pm/Oe and resolution of 11.33 Oe. The proposed structure has a vital role on nan fluidic technology. Because of the tenability of external magnetic field strength, high sensitivity and resolution the structure gives an awaited technology for the nan fluidics research.
Exploring Refractive Index Sensor Using Gold Coated D-shaped Photonic Crystal Fiber for Biosensing Applications
(Optik, Elsevier, 2020-02) Khan, Md. Shohag; Ahmed, Kawsar; Hossain, Md. Nadim; Paul, Bikash Kumar; Nguyen, Truong Khang; Dhasarathan, Vigneswaran
In this paper, D-shaped photonic crystal fiber (PCF) based structure has been designed where the chemically sustainable and renowned material gold (Au) is used for high sensing between the core and the analyte. This structure is constructed with pure Silica (SiO2) to obtain maximum performance. The formal simulation is done by the finite element method. By the simulation, here is obtained the maximum wavelength sensitivity of 66666.67 nm/RIU, high amplitude sensitivity (AS) of -1488.82 RIU−1 for the refractive index of na = 1.36 to 1.39. This structure also obtained high resolution of 9.66 × 10-4 RIU for the x polarization. For finding out the efficient result in the field of biological and biomedical analyte detection, the proposed structure is going to be the suitable choice.
Fe3o4 Nanofluid Injected Photonic Crystal Fiber for Magnetic Field Sensing Applications
(Journal of Magnetism and Magnetic Materials, Elsevier Publications, 2020-01-15) Mitu, Sumaiya Akhtar; Dey, Dipak Kumar; Ahmed, Kawsar; Paul, Bikash Kumar; Luo, Yanhua; Zakaria, R.; Dhasarathan, Vigneswaran
This work proposes a novel magnetic field sensor based on nanoparticle ferrosoferric oxide (Fe3O4) magnetic fluid for different magnetic field strength from 100 Oe to 160 Oe. Investigations are performed to verify the simulation model and measure the spectral shift for applied magnetic field strength. The results of this task indicate that it has high sensitivity response with the variation of various magnetic field strength (Oe). The reported sensitivity as 83268.46 nm/RIU and 83188.25 nm/RIU for both for X and Y polarization respectively and it will be the maximum sensitivity to the best of knowledge. The other significant of this work that the proposed sensor seem to be as simple structure, low cost, high accuracy and also helpful for microfluidics technology.
Investigation of Gas Sensor Based on Differential Optical Absorption Spectroscopy Using Photonic Crystal Fiber
(Alexandria Engineering Journal, Elsevier, 2020-12) Paul, Bikash Kumar; Ahmed, Kawsar; Dhasarathan, Vigneswaran; Al-Zahrani, Fahad Ahmad; Aktar, Mst. Nargis; Shahin Uddin, Muhammad; H.Aly, Arafa
This study presented a novel shape photonic crystal fiber based gas sensor for the first time. Perfectly circular shape air hole are arranged to form core and cladding region. Based on full vector finite element method (FV-FEM) and circular shape perfectly matched layer (PML) the designed sensor has been investigated. The model field, effective mode index, sensitivity, confinement loss, effective mode area, nonlinearity, V parameter of the sensor fiber fundamental mode are investigated through FEM based commercial software package COMSOL Multiphysics. Numerical simulations evidences that the sensor shows the sensitivity responses of 64.69% and confinement loss of 4.38 × 10-06 dB/cm at the transmission wavelength λ = 1.55 µm. Besides, the sensor achieves single mode operation over the whole operating wavelength. Based on these excellent optical behaviors of the designed sensor it can be undoubtedly expect that, this sensor will play an influential role detecting gas molecules as well as PCF based optical sensing areas.
MLAFP-XN: Leveraging neural network model for development of antifungal peptide identification tool
(Elsevier, 2024-09-30) Sultana, Md. Fahim; Shaona, Md. Shazzad Hossain; Chen, Li; Karima, Tasmin; Dhasarathan, Vigneswaran; Moni, ∙ Mohammad Ali
Infectious fungi have been an increasing global concern in the present era. A promising approach to tackle this pressing concern involves utilizing Antifungal peptides (AFP) to develop an antifungal drug that can selectively eliminate fungal pathogens from a host with minimal toxicity to the host. Accordingly, identifying precise therapeutic antifungal peptides is crucial for developing effective drugs and treatments. This study proposed MLAFP-XN, a neural network-based strategy for accurately detecting active AFP in sequencing data to achieve this objective. In this work, eight feature extraction techniques and the XGB feature selection strategy are utilized together to present an enhanced methodology. A total of 24 classification models were evaluated, and the most effective four have been selected. Each of these models demonstrated superior accuracy on independent test sets, with respective scores of 97.93 %, 99.47 %, and 99.48 %. Our model outperforms current state of the art methods. In addition, we created a companion website to demonstrate our AFP recognition process and use SHAP to identify the most influential properties.
Multicore Bi-layer Gold-coated SPR-based Sensor for Simultaneous Measurements of CFC and HCFC
(2019) Jabin, Md. Asaduzzaman; Ahmed, Kawsar; Rana, Md. Juwel; Paul, Bikash Kumar; Dhasarathan, Vigneswaran; Uddin, Muhammad Shahin
Global warming is an alarming issue in our daily life. As we know that CFCs and HCFCs have a great impact on ozone depletion and global warming process. So, there must be a cheaper way to detect CFCs and HCFCs from refrigerant products like refrigerator, aerosols, air-conditioner, etc. So, for the very first time, this paper proposes a novel highly sensitive dual-core bi-layer gold-coated surface plasmon resonance (DB-SPR)-based photonic crystal fiber (PCF) for sensing CFCs and HCFCs in the field of chemical and biosensing. The analysis is assumed at 20∘∘C (293 K) for the concentration level of CFCs and HCFCs ranging between 20% and 80%. The entire numerical evaluation process is done by using finite element method (FEM) with a full vectorial software named COMSOL V-5.1 by examining the number of mesh elements of 228,120 which has better flexibility in the fabrication process. The proposed model can prove itself better than any other models by the justification of the major optical parameters, such as birefringence (Bii), coupling length (Lcc), confinement loss (αcαc), transmittance (Txx), transmittance variance (Tvv), power fraction (Pff), amplitude sensitivity (SAA), wavelength sensitivity (Sww), figure of merit (FOM), resolution (Rl), resonance (R2), etc. which respectively corresponds to their maximum performance profiles of 0.038, 40 μμm, 1140 dB/cm, −180 dB, 410 dB/RIU, 51%, −3200 RIU−1−1, 30450.43 nm/RIU, 1300, 1.25×10−5−5, 0.98712. So, it is evident that proposed SPR PCF can be a tough competitor in the field of biosensing and chemical sensing as well as gas sensing.
Numerical Analysis of Circular Core Shaped Photonic Crystal Fiber for Orbital Angular Momentum with Efficient Transmission
(Applied Physics B: Lasers and Optics, Springer, 2020-08-07) Hassan, Md. Mehedi; Kabir, Md. Anowar; Hossain, Md. Nadim; Nguyen, Truong Khang; Paul, Bikash Kumar; Ahmed, Kawsar; Dhasarathan, Vigneswaran
In this paper, a circular core shaped photonic crystal fiber (PCF) is proposed and the optical propagation characteristics are investigated and simulated by applying the finite element method (FEM) with the help of COMSOL Multiphysics software. The cladding of this PCF is composed of fused silica including a large center air-hole. The simulation process is performed within 1000–2000 nm wavelength. The raised PCF supports up to 38 OAM modes with larger bandwidth (1000 nm) as well as flat dispersion variations. The refractive index difference can exceed 10−410−4 for each OAM mode. The confinement loss of this PCF remains low approximately around 10−910−9 to 10−810−8 dB/m, comparatively better the nonlinearity, the numerical aperture, and the dispersion variation evolves into smoother. So, all these optimizing optical properties prove that our designed PCF is a promising candidate for the OAM mode transmission and other relevant optical communications.
Oligoporous-core Quasi Cladding Photonic Crystal Fiber Based Micro-sensor for Alcohol Detection
(Physica B: Condensed Matter, Elsevier, 2020-05-01) Paul, Bikash Kumar; Ahmed, Kawsar; Dhasarathan, Vigneswaran; Nguyen, Truong Khang
A novel quasi-fiber sensor is introduced for alcohol sensing applications with efficient optical guiding properties. The Finite Element Method (FEM) has been employed to explore the guiding properties over a wide range of 0.80 μm–2.8 μm wavelength. The integral purported sensor structure is implemented with scattering boundary condition (SBC) on its outer boundary. The numerical investigation of the optimum structure reveals its relative sensitivity as 60%~98% corresponding to the power fractional distribution of 75% and 72% respectively. Furthermore, a high Numerical Aperture (NA) of 0.68 is obtained from the introduced sensor at the operating wavelength of 2.6 μm. The overall results promise for better performances of proposing sensor, particularly in medical imaging applications.
Quasi Photonic Crystal Fiber Based Spectroscopic Chemical Sensor in the Terahertz Spectrum: Design and Analysis
(IEEE, 2018-09-28) Paul, Bikash Kumar; Ahmed, Kawsar; Dhasarathan, Vigneswaran; Ahmed, Fahad
In this paper, a novel microstructure quasi-photonic crystal fiber (Q-PCF) design is proposed. Aimed at a high relative sensitivity it is targeted for chemical sensing applications in the terahertz regime. A rigorous full-vector finite element method (FV-FEM) based numerical investigation has been applied by employing an anisotropic perfectly matched layer (A-PML) for optimizing key parameters. Improved relative sensitivity response of 78.8%, 77.8%, 69.7% are achieved for targeted analytes ethanol, benzene and water respectively at the operating frequency of f = 1.3 THz. Moreover, confinement loss, effective area, power fraction and numerical aperture (NA) are analyzed from 0.8 THz to 2.0 THz.
Theoretical Analysis of Highly Temperature-Sensitive Fem Based Optical Sensor in the Infrared Range
(Scopus, 2020) Abdullah, Hasan; Islam, Md. Rafiqul; Ahmed, Kawsar; Malka, Dror; Nguyen, Truong Khang; Hossain, Md. Nadim; Paul, Bikash Kumar; Dhasarathan, Vigneswaran
his paper demonstrates a highly sensitive temperature sensor based on photonic crystal fiber (PCF) to evaluate the temperature of an analyte. The proposed structure is evaluated by a finite-element method (FEM) which is composed of one silica core and an analyte core. The maximum wavelength sensitivity of 29,411.765 nm/refractive-index unit (RIU) and the maximum temperature sensitivity of 5000 pm/°C are recorded for the proposed PCF based temperature sensor. According to our knowledge, this measurement represents the maximum sensitivity response to the PCF based temperature sensor. Additionally, the temperature is tuned between 30–60 °C for getting highest sensitivity response. Besides, the peak wavelength shifts, different loss spectra are also investigated for the proposed model. In the future, this proposed structure can be used for multiple sensing purposes such as gas sensing, biomedical sensing, salinity sensing, chemical sensing with modification and analyzing upon this structure.