Mohamed Nizar S
@ifet.ac.in
Associate Professor/ECE
IFET COLLEGE OF ENGINEERING
RESEARCH INTERESTS
Fiber Optic Sensors
Optical Communication
Scopus Publications
Scopus Publications
Elizabeth Caroline Britto, Bhuvaneshwari Krishnamoorthi, R. Rajasekar, and S. Mohamed Nizar
Springer Science and Business Media LLC
S. Mohamed Nizar, Elizabeth Caroline Britto, Margarat Michael, and K. Sagadevan
Springer Science and Business Media LLC
K Sagadevan, B Elizabeth Caroline, B Lavanya, S Lavanya, and S Mohamed Nizar
IEEE
Terahertz (THz) technology, which is one of the emerging sectors, has greater demand for high-performance devices. It has a wide range of applications in time domain spectroscopy, highly sensitive sensing, security monitoring, biological imaging, and high-speed communication. Therefore, one of the milestones of terahertz technology is an efficient shielding of THz radiation which absorbs it rather than radiating. Hence, designed an absorber that uses graphene as a metamaterial that has a resonant frequency at 3THz and an absorption bandwidth range from 1. 3THz$\\sim$4.5THz. The Bandwidth, resonant frequency and absorption of the absorber can be varied by changing different geometric parameters of metamaterial and substrate which makes it a tunable absorber. And at frequencies 2THz and 4. 3THz, the absorber works effectively and has an absorption rate of nearly 100% which makes it applicable to various terahertz applications. It can be effectively used in LO (Low Observable) technology.
Elizabeth Caroline Britto, S. Mohamed Nizar, and Prabu Krishnan
Springer Science and Business Media LLC
S. Mohamed Nizar, B. Elizabeth Caroline, and Prabu Krishnan
Springer Science and Business Media LLC
S. Mohamed Nizar, B. Elizabeth Caroline, and Prabu Krishnan
Springer Science and Business Media LLC
S. Mohamed Nizar, K. Loga, B. Elizabeth Caroline, and S. Mahalakshmi
IEEE
Photonic crystals have some unique properties if any optical fiber depends on those fundamentals it is meant to be a PCF. It is designed by using the three major elements such as core, cladding, and the PML. Here, the detection Nitrous Oxide (N2O) and Benzene (C6H6) Gas present in the atmosphere is done by designing a highly sensitive Photonic Crystal Fiber based sensor. There are many ozone depleting elements in that one of the major harm is due to (N2O) gas and it even causes many health defects to living organisms such as depression, hypoxia, psychosis, damages immune system, and loss of memory. Basically, there is a presence of (C6H6) gas in the atmosphere these elements react with the chemical compounds creating smog which breaks down at some point and then the collision between rain and snow happens resulting in contamination of water and soil. It also results in harming the human beings by creating problems such as increasing heart rate, unconsciousness, level of RBC gets decreased, and damaging the bone marrow. Due to all these reasons, at the present scenario it is very much needed to sense the Nitrous Oxide (N2O) and Benzene (C6H6) Gas at atmospheric level. The highly sensitive proposed model is designed by using the COMSOL Multiphysics software by obtaining an accurate and high performing output. The simulation results are calculated by using the final element method which results in the relative sensitivity of 99.384%, 99.937% and 9.56 × 10−11 dB/m, 0dB/m loss of confinement at the wavelength of λ = 1μm, 0.20μm for N2O and C6H6 Gas. According to the above results it is proved that the proposed gas sensor is very simple with high rate of performance and accuracy.
S. Mahalakshmi, S. Mohamed Nizar, B. Elizabeth Caroline, K. Sagadevan, and K. Loga
IEEE
PCF is a photonic crystal-based optical fibre. For sensing HIV (Human Immunodeficiency Virus) in the human body, a photonic crystal fiber-based biosensor is proposed.The hollow core photonic crystal fibre (HCPCF) is utilised in this article to elucidate the HIV virus contaminated cells in the body. This model gives higher sensitivity in detecting contaminated HIV virus by minimising confinement loss. To analyse the output of the PCF sensor the Sample cells are inserted in the core.The hollow core with air ring enhances the sensing for biomedical analytes.Relative Sensitivity(Rs), Effective mode area (Aeff), Confinement loss (αCL) and effective mode index can be determined by using this Comsol multiphysics software. This Software is used to design the high complexity fabrication model.Pathogen impacts the defensive mechanism of the human individual.AIDS (acquired immunodeficiency syndrome) can develop from HIV if it is not adequately managed). To examine the PCF sensor's operation, sample cells typically placed into the core. The hollow core with air ring optimizes the sensing of biological analytes. At Certain Wavelength the laser light passes through a core. This Software is employed in construct the high complexity fabrication.TheHIV pathogen develops the HIV/AIDS epidemic spectrum.The human immune system's CD4+ T cells, macrophages, and dendritic cells are frequently contaminated by that of the retrovirus designated as HIV. It suppresses CD4+ T cells both intrinsically and extrinsically. The three levels of HIV infectioncompriseof acute, chronic, and acquired immunodeficiency syndrome (AIDS).Although there is no cure for HIV, medication can help to standstill or quit the progression of the disease. Antiretroviral therapy is a type of treatment for HIV infection (ART). HIV is spurred on by a virus. Through sexual contact, illicit drug use, reusing needles,in touch with contaminated blood, or contact with infected blood, it can be spread from mother to infant, delivery, or suckling. HIV attacks CD4 T cells, is some kind of white blood cell that is essential for disease resistance. The design of the previous work is quite complicated and lacks precision. So, using the COMSOL Multiphysics software, we created a basic structure PCF-based Bio Sensor for HIV sensing. We reached a relative sensitivity of around 96.827 for wavelengthλ = 0.7m by interpreting the simulation findings. Our concept appears to be fairly basic and accuratepremised on the results we have obtained.
B. Elizabeth Caroline, M. Margarat, M. Divya Shree, and S. Mohamed Nizar
IEEE
Dense Wavelength Division Multiplexing (DWDM) is an excellent solution for increasing channel capacity and be able to meet rapidly increasing bandwidth demands in optical fiber communication. The optical signal in this technology will convey numerous streams of data, each with its own individual wavelength. This article utilizes a single mode fiber with a length of 120km and a wavelength of 1555nm to reduce signal dispersion. The DWDM system analysis is carried out using an optisystem with a flow rate of 10Gbits/s per channel and simulation, optical amplifiers are utilized to achieve signals with enhanced Q-Factor and BER. The proposed system is used for the data transmission over longer distances more than 50km and helps to reduce the signal noise of the system.
K. Loga, S. Mohamed Nizar, and B. Elizabeth Caroline
IEEE
PCF is a type of optical fiber which relies on the property of photonic crystals. Design of Photonic Crystal Fiber based sensors is proposed for sensing Nitrous Oxide (N2O) and Benzene (C6 H6) Gas present in the atmosphere. The (N2O) Gas is known to be very dangerous in the environment causing damage to all natural resources by depleting the ozone layer and affects all living creatures by inducing very harmful diseases. Even-though it has a shorter life span it is 300 times more powerful than Carbon-dioxide (CO2) gas so it harms very faster. Formation of smog is due to the collision of chemical with Benzene gas present in the atmosphere after some point it breaks down and joins with rain and snow by polluting the soil and water. It also causes various problems to human beings such as minimizing the count of RBC, immune system damage, leads to anemia, increase in bleeding. Due to this the detection Nitrous Oxide and Benzene Gas at atmospheric level is very much needed in this current situation. In the existing work, the design is very complex and does not have high accuracy. So, we have designed a simple structure PCF based Gas Sensor for sensing N2O and (C6 H6) using COMSOL Multiphysics software. By, perceiving the simulation results we have achieved a relative sensitivity of about 73.822%, 76.422% at wavelength of absorption λ = 1.43μm, 1.51μm for N2O and C6 H6 Gas with zero confinement loss. According to the output we have obtained our design is very simple with high accuracy.
S Mohamed Nizar, Elizabeth Caroline, and Prabu Krishnan
Springer Science and Business Media LLC
S. Mohamed Nizar and S. Balakumaran
IEEE
Carbon monoxide and Pentane is Hazardous gases, which is harmful to human begins . These gases are present in the atmosphere in the minimum amount . This paper is designed to detect the leak of hazardous gas from the industries and refrigerators with high sensitivity of 98% and its wavelength is 1.5µm. From the proposed PCF the confinement . loss is 0db/m, when the wavelength increased and reaches above 15µm, then confinement . loss get increased 0.60 db/m. The photonic crystal fiber arranged in structure of cladding and core arranged in different shapes which helps to provide better sensitivity and minimum confinement. loss. The result helps to detect the hazardous gas leakage from industry and refrigerator.
S. Mohamed Nizar, B. Kesavaraman, E. Priyanka, and R. Jayasri
IOP Publishing
Abstract In this paper, a circular Photonic Crystal fiber (C-PCF) is designed to detect two types of antibodies such as Immunoglobulin G (IgG) and Immunoglobulin M (IgM). Light guiding property of different refractive index (RI) of IgG and IgM are analyzed. For various RI value confinement losses, relative sensitivity and effective mode area are analyzed. The projected C-PCF sensor produces low confinement loss and high sensitivity for the detection of IgM and IgG. Realistic execution of the proposed PCF sensor is viable by accessible technology and it is applicable to sense corona virus disease.
S. Mohamed Nizar, S. Rafi Ahamed, E. Priyanka, R. Jayasri, and B. Kesavaraman
IOP Publishing
Abstract Photonic Crystal Fiber (PCF) is the category of optical fiber; the assets of this PCF is grounded on a photonic crystal. This PCF is of two types, and they are named as solid core PCF and Hollow-core PCF. Here, in this paper a survey is proposed for different shape PCF. These different shapes PCF uses different background material like silica, Zeonex, and TOPAS. Using this different shape PCF with different background material the sensitivity and confinement loss are compared. This paper can enhance research work in the field of fiber optics.
Vigneshkumar P and Mohamed Nizar S
IEEE
This work expresses a circular center core fiber based gas sensor for noticing carbon disulphide (CS2). In this paper, the entire reenactment has finished by COMSOL software by (FEM). The rectangular center based sensor is working for observing the gases with a high affectability differentiation to strong and circular center PCF sensors. Distinctive mathematical boundaries of this plan, for example, air opening, center material, cladding material and Perfectly Matched Layer (PML) have been dramatically investigated to make the plan more compelling. This plan furnishes the overall sensitivity of 99.53% with a confinement loss of 0.002 dB/m at λ= 1.8 μm intuition of CS2. The lower compelling region based rectangular gas sensor can keep a lot of light in the center and results the best presentation. The result gives the sensor being a fitting contender for noticing CS2 gas in the climate precisely.
S.Mohamed Nizar and B.Elizabeth Caroline
IEEE
A review of the fiber optic sensor based on Fiber Bragg Grating (FBG) was done for the different parameters such as humidity, temperature, force and Refractive Index (RI) of the different medium which was analyzed from different experiments. Using single sensors more than one parameter can be measured using FBG. Fiber optic sensors are lightweight and portable in size, it can be used to measure minute variations. The application of FBG sensors is found to be in the field of biomedical, food processing, industrial measurements and health monitoring of the civil structures. The analysis for different measured parameters were considered and few parameters were compared