Article
Chemistry, Analytical
B. S. Kavitha, S. Sridevi, Pandeeswar Makam, Debasis Ghosh, Thimmaiah Govindaraju, S. Asokan, A. K. Sood
Summary: An effective optical method using CNC bolaamphiphile functionalised eFBG sensor has been developed for selective and rapid detection of mercury (Hg2+) in drinking water. The sensor shows a linear response to thiol-Hg2+ coordination with a LOD of 100nM. Coated with CNC, the sensor achieves a LOD of 1pM with a dynamic range from 1pM to 1μM, showing repeatability and specificity in the presence of interfering metals. The sensor has potential to be a highly sensitive, selective, portable, real-time, on-site optical probe for Hg2+ detection in drinking water.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Chemistry, Analytical
Na Zhao, Zhongkai Zhang, Qijing Lin, Kun Yao, Liangquan Zhu, Yi Chen, Libo Zhao, Bian Tian, Ping Yang, Zhuangde Jiang
Summary: In electrohydrostatic drive actuators, there is a need for temperature and pressure monitoring in complex environments. This paper proposes a gold-plated Fiber Bragg grating (FBG) sensor that has high sensitivity to both temperature and pressure, enabling simultaneous measurement of both parameters. Experimental results show that the temperature sensitivity of the gold-plated FBG is 3 times that of the quartz FBG, while the pressure response sensitivity is the same. Therefore, this sensor has great potential for health monitoring in complex environments with high temperature and high pressure.
Article
Engineering, Electrical & Electronic
Javier Elaskar, Francesca Bontempi, Philippe Velha, Rana M. Armaghan Ayaz, Lorenzo Tozzetti, Stefano Faralli, Fabrizio Di Pasquale, Claudio J. Oton
Summary: We present an interferometer-based multiplexed fiber Bragg grating (FBG) interrogator using silicon photonic technology. The photonic-integrated system includes various components integrated on a 6x8 mm² silicon chip, such as grating couplers, active and passive interferometers, a 12-channel wavelength-division-multiplexing (WDM) filter, and Ge photodiodes. The device showcases the advantage of integrated photonics, allowing the integration of different demodulation schemes in the same chip, enabling easy scalability without increasing dimensions or cost.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Review
Chemistry, Analytical
Hang Qu, Weiyuan Huang, Zhoupeng Lin, Xin Cheng, Rui Min, Chuanxin Teng, Christophe Caucheteur, Xuehao Hu
Summary: This article reviews recent research progress on the annealing effects on polymer optical fibers (POFs) that are used for fiber Bragg gratings (FBGs) in POFs. The review covers the principle of annealing, different annealing timings, methods and conditions, as well as the impact of annealing on POFs and POFBGs. It provides a comprehensive overview of annealing techniques and their importance in this field.
Article
Engineering, Electrical & Electronic
Hanqi Zhang, Hengtian Zhu, Qi Wu, Ye Chen, Rong Wang, Fei Xu, Ke Xiong
Summary: In this study, a microfiber Bragg grating (MFBG) bonded using tapered cantilever was designed and investigated using experimental, theoretical, and numerical methods. The tapered structure amplified the ultrasonic signal and eliminated the influences of static strain and evanescent field using the cantilever. Compared to the cantilevered fiber Bragg grating, the sensitivity of the sensor showed an upward trend with decreasing diameter, with 331% and 108% sensitivity increments observed for MFBGs with 20 and 40 μm diameters, respectively. The improvement was particularly apparent at high frequencies of the ultrasonic signal.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Xiaobin Xue, Xile Han, Linhao Li, Li Min, Daotong You, Tuan Guo
Summary: Respiration rate and volume are important physiological indicators of human health, which can reflect cardiovascular health status and cardiopulmonary function. In this study, a compact breath monitoring system based on a wearable tilted fiber Bragg grating (TFBG) curvature sensor is demonstrated. The TFBGs provide highly sensitive, real-time response to curvature changes during respiration, assisted by a custom designed breathing tube. The proposed miniaturized and cost-effective sensing system consists of a tunable laser module, a field programmable gate array acquisition control circuit module, and a sensor module, and different breathing patterns can be successfully identified from the output of the sensor.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Francesco Anelli, Andrea Annunziato, Mike Godfrey, Antonella Maria Loconsole, Christopher Holmes, Francesco Prudenzano
Summary: A high curvature flexible Bragg grating was designed, fabricated, and characterized using silica glass. The curvature sensing mechanism for slightly off-axis core was explained theoretically and demonstrated experimentally. The electromagnetic behavior of the sensor was investigated using conformal mapping, modal analysis, and coupled-mode theory. The reflection spectrum and the relationship between resonant wavelengths and curvature were measured for a large curvature range.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Tingfeng Li, Ruohui Wang, Xueguang Qiao
Summary: We proposed a fiber Bragg grating (FBG) accelerometer demodulation method based on an in-line Sagnac interferometric structure. The method uses an electro-optical phase modulator as a phase-generating carrier modulation module. The study theoretically analyzed the in-line Sagnac optical path interference based on the electro-optical phase modulator and described its modulation mechanism. Experimental results showed that the proposed method effectively reduces system background noise and provides a fast response to interferometric optical path changes. The sensitivity of the demodulation scheme based on the in-line Sagnac structure was also improved compared to the Sagnac ring structure.
IEEE SENSORS JOURNAL
(2022)
Article
Chemistry, Analytical
Vajresh N. Kumar, B. S. Kavitha, S. Asokan
Summary: In this work, a MA-AuNP coated e-FBG sensor capable of detecting lead metal ion in water is demonstrated. The sensor exhibits a low detection limit, wide dynamic range, and good recovery concentration for real water samples. It shows excellent reproducibility, specificity, portability, and real-time response, making it an ideal optical probe for drinking water.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Chemistry, Multidisciplinary
Huajian Zhong, Xueya Liu, Cailing Fu, Baijie Xu, Jun He, Pengfei Li, Yanjie Meng, Chao Du, Lin Chen, Jian Tang, Yiping Wang
Summary: Two types of series-integrated fiber Bragg gratings (SI-FBGs), strong and weak SI-FBGs, were inscribed in a standard single-mode fiber (SMF) using femtosecond laser point-by-point technology. The grating pitch of each FBG and the distance between the FBGs can be flexibly controlled by adjusting the inscription parameters. The strong SI-FBGs were used to measure temperature distribution and the weak SI-FBGs were used to measure strain distribution, achieving high spatial resolution.
Article
Engineering, Electrical & Electronic
Dongtao Hu, Shanke Lv, Yongxing Guo, Huagang He, Jiayi Liu
Summary: The article presents a fiber Bragg grating (FBG) force sensor with enhanced sensitivity using a strain-reinforcing mechanism, achieving high sensitivity and good performance, demonstrating potential for superior structural health monitoring.
IEEE SENSORS JOURNAL
(2021)
Review
Chemistry, Physical
Marco Bonopera
Summary: With the development of fiber optical technologies, fiber Bragg grating (FBG) sensors are increasingly used in structural health monitoring. This article provides an overview of the recent advancements and principles of FBG-based displacement sensors, focusing on wavelength, intensity, and phase signal demodulation. Future research will aim to improve the efficiency of FBG-based displacement sensors through the use of different elastic structures, gratings manufactured through special fibers, and new temperature compensation methodologies.
Article
Chemistry, Analytical
Abdullah Al Noman, Jitendra Narayan Dash, Md Abdullah Al Maruf, Cheng Xin, Hwa-Yam Tam, Changyuan Yu
Summary: A label-free-based fiber optic biosensor based on etched tilted Bragg fiber grating (TFBG) is proposed and practically demonstrated. The hybridization of probe DNA with the complementary DNA (cDNA) has been monitored using wavelength-dependent interrogation. The reproducibility of the probes has been demonstrated and the response towards non-cDNA has also been investigated to establish its specificity.
Article
Engineering, Multidisciplinary
Yuan Xue, Jianping He, Dongqing Zhang, Wanru Liu
Summary: Geotextile is important for high-speed railway subgrade reinforcement, and its mechanical properties have been studied using an intelligent geotextile developed with optical fiber sensors. The data from tests and field monitoring show that the strain data measured by the sensor is consistent with the data from settlement plates, indicating that the intelligent geotextile not only has good reinforcement function but also sensing function.
Article
Chemistry, Analytical
Takhmina Ayupova, Madina Shaimerdenova, Daniele Tosi
Summary: In this work, a gold-coated shallow-tapered chirped fiber Bragg grating (stCFBG) for dual refractive index (RI) and temperature sensing is presented. The stCFBG demonstrates high sensitivity, low cross-talk values, and is suitable for biosensing and chemical analyte detection.
Article
Instruments & Instrumentation
E. K. Ng, N. Mohd Yusoff, H. K. Lee, J. Y. C. Liew, M. H. Abu Bakar, N. H. Zainol Abidin, M. T. Alresheedi, M. A. Mahdi
Summary: This paper focuses on the design and fabrication method of black phosphorus/polydimethylsiloxane composite microfiber-based saturable absorber (SA) for ultrashort pulse generation. The integration of the SA in an erbium-doped fiber laser exhibited a pulse duration of 724 fs. This work provides a guideline for the design of microfiber-based SA using spin-coating technique to maximize its laser performances.
INFRARED PHYSICS & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Mohammed M. Alkhabet, Saad H. Girei, Husam K. Salih, Rasha Thabit, Mohammed Abdullah Issa, Suriati Paiman, Norhana Arsad, Mohammed Thamer Alresheedi, Mohd A. Mahdi, Mohd H. Yaacob
Summary: This study describes the development of a palladium-coated optical fiber for room temperature hydrogen gas detection. The sensor exhibits high sensitivity, good selectivity, and operates reliably at room temperature. The results demonstrate that this simple and cost-effective method enables reliable and efficient detection of hydrogen gas.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2023)
Article
Optics
Nurul Hida Zainuddin, Hui Yee Chee, Suraya Abdul Rashid, Muhammad Zamharir Ahmad, Muhammad Hafiz Abu Bakar, Mohd Adzir Mahdi, Mohd Hanif Yaacob
Summary: This paper reports on the development of a DNA biosensor using carbon quantum dots (CQDs) for enhanced detection of Leptospira DNA. The biosensor demonstrated high sensitivity and specificity, and has the potential for the development of more sensitive and reliable diagnostic testing for leptospirosis in the future.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Optics
N. Z. A. Naharuddin, M. H. Abu Bakar, N. Tamchek, M. T. Alresheedi, A. F. Abas, C. S. Goh, N. H. Zainuddin, M. A. Mahdi
Summary: This study compares the optical performance of a passively mode-locked erbium-doped fiber laser incorporating gold nanoparticles (Au-NPs) of different sizes as saturable absorbers (SAs). The Au-NPs were mixed with polydimethylsiloxane and spin coated on a microfiber waveguide. The fabricated Au-NP-based SA was used in a ring cavity erbium-doped fiber laser, and its lasing performance was evaluated by comparing SA characteristics and pulse qualities for different Au-NP sizes. The best pulse performance was achieved with 20 and 40 nm Au-NP size.
Article
Engineering, Electrical & Electronic
Norita Mohd Yusoff, Eng Khoon Ng, Natrah Shafiqah Rosli, Che Azurahanim Che Abdullah, Nelydia Md Yusoff, Mohd Adzir Mahdi
Summary: A tapered microfiber decorated with titanium dioxide-silicon dioxide nanocomposite saturable absorber (TiO2-SiO2-SA) was fabricated using alkali fusion method and spin-coating technique. The TiO2-SiO2-SA showed a modulation depth of 17.1%, a saturation fluence of 31.7 μJ/cm(2), and a non-saturable loss of 35.4%. At a repetition rate of 10.39 MHz and a wavelength of 1.56 μm, the TiO2-SiO2-SA generated a pulse duration of 797 fs and an average output power of 16.57 mW. This work demonstrates an improved pulse duration using titanium-based saturable absorbers and suggests a new route for utilizing nanomaterials derived from waste products in ultrafast photonic applications.
IEEE PHOTONICS JOURNAL
(2023)
Article
Optics
Norita Mohd Yusoff, Han Kee Lee, Eng Khoon Ng, Natrah Shafiqah Rosli, Che Azurahanim Che Abdullah, Mohammed Thamer Alresheedi, Mohd Adzir Mahdi
Summary: A nanocomposite of titania-coated silica saturable absorber (TiO2-SiO2-SA) with nonlinear saturable absorption and optical limiting effect was fabricated. It demonstrated stable noise-like pulse (NLP) generation in a ring cavity erbium-doped fiber laser at low threshold power and maintained operation at high pump power. The NLP with TiO2-SiO2-SA showed stability and potential as a next-generation nanocomposite material for ultrafast photonics.
JOURNAL OF LUMINESCENCE
(2023)
Article
Polymer Science
Mohammed Thamer Alresheedi, Mohamed Elsafi, Yosef T. T. Aladadi, Ahmad Fauzi Abas, Abdullrahman Bin Ganam, M. I. Sayyed, Mohd Adzir Mahdi
Summary: This study aimed to prepare silicone rubber composites with heavy metal oxide nanoparticles for gamma ray shielding applications. The incorporation of heavy metal oxide nanoparticles improved the thermal stability, mechanical properties, and radiation shielding performance of the silicone rubber composites. The addition of heavy metal oxide nanoparticles decreased the transmission factor (TF) of gamma rays through the composites, indicating enhanced radiation shielding effectiveness. Furthermore, the linear attenuation coefficient (LAC) and half-value layer (HVL) of the composites were evaluated, with HMO inclusion leading to increased photon interactions and reduced HVL values, particularly at low energy levels.
Article
Chemistry, Multidisciplinary
Ahmad Fauzi Abas, Kuen Yao Lau, Yahya Mohammed Al-Moliki, Yosef Taher Aladadi, Mohammed Thamer Alresheedi, Mohd Adzir Mahdi
Summary: This study presents a passive mode-locked erbium-doped fiber laser using a graphene nanoplatelet-saturable absorber (GNP-SA) to generate femtosecond pulses. The output coupling ratio and intracavity power have been found to affect the optical amplification properties and lasing wavelength of the fiber laser. The results contribute to the understanding of the behavior of oscillating light under varying intracavity power.
APPLIED SCIENCES-BASEL
(2023)
Review
Chemistry, Analytical
Yasmin Mustapha Kamil, Muhammad Hafiz Abu Bakar, Nurul Hida Zainuddin, Mohd Hanif Yaacob, Mohd Adzir Mahdi
Summary: Biosensors play a crucial role in diagnostic and medicinal applications for monitoring, managing illness, and public health. Microfiber-based biosensors have the ability to sensitively measure the presence and behavior of biological molecules. The flexibility of microfiber in supporting different sensing layer designs and integration with nanomaterials enhances specificity.
Article
Materials Science, Multidisciplinary
Norita Mohd Yusoff, Mahmoud Hazzaa Mohamed Ahmed, Eng Khoon Ng, Mohammed Thamer Alresheedi, Mohd Zul Hilmi Mayzan, Mohd Adzir Mahdi
Summary: This work presents a tapered fiber decorated with bulk alpha-alumina that induces noise-like pulse (NLP) in an eye-safe wavelength region. The NLP is formed through light-matter interaction within an ultrathin tapered fiber in a ring configuration of a thulium-doped fiber laser.
RESULTS IN PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Huey Jing Tan, Zulkarnain Zainal, Zainal Abidin Talib, Hong Ngee Lim, Suhaidi Shafie, Sin Tee Tan, Noor Nazihah Bahrudin
Summary: Improving the photoelectrochemical performance of cadmium sulfide (CdS) thin films through preheating treatment and their combination with zinc oxide (ZnO) enables the creation of efficient heterostructures for solar cells.
Article
Chemistry, Physical
Mohammed Thamer Alresheedi, Mohamed Elsafi, Yosef T. Aladadi, Ahmad Fauzi Abas, Abdullrahman Bin Ganam, M. I. Sayyed, Mohd Adzir Mahdi
Summary: This study developed a mortar composite with improved gamma ray shielding properties by adding WO3 and Bi2O3 nanoparticles, as well as replacing part of the sand with granite residue. The addition of nanoparticles and granite residue improved the homogeneity of the mixture and reduced the percentage of voids. Thermal analysis showed that the material exhibited improved thermal properties with the increase in nanoparticles, without weight loss at higher temperatures. The incorporation of Bi2O3 nanoparticles greatly affected the linear attenuation coefficient at low energies and had a noticeable effect at higher energies, resulting in excellent gamma ray shielding properties.
Article
Chemistry, Multidisciplinary
Maisarah Mansor, Nadiah Husseini Zainol Abidin, Norita Mohd Yusoff, Kuen Yao Lau, Josephine Liew Ying Chyi, Vijay Janyani, Amit Kumar Garg, Mohammed Thamer Alresheedi, Mohd Adzir Mahdi
Summary: This research demonstrates the use of tungsten trioxide/polydimethylsiloxane nanocomposite saturable absorber (WO3/PDMS-SA) in achieving mode-locked conventional soliton (CS) and noise-like pulse (NLP) laser generation with net anomalous dispersion. The switching from CS regime to NLP regime was achieved by varying the pump power. The pulse laser exhibited good stability and signal-to-noise ratio in both CS and NLP regimes, making it potentially beneficial for compact dual-purpose laser systems.
NANOTECHNOLOGY REVIEWS
(2023)
Article
Optics
Hazwani Suhaila Hashim, Yap Wing Fen, Nur Alia Sheh Omar, Wan Mohd Ebtisyam Mustaqim Mohd Daniyal, Nurul Illya Muhamad Fauzi, Jaafar Abdullah, Mohd Adzir Mahdi
Summary: By adding graphene quantum dots to the gold thin film, the sensing capabilities of the surface plasmon resonance sensor for phenol have been significantly improved. The gold-graphene quantum dots thin film has a lower limit of detection and higher sensitivity, and exhibits excellent selectivity towards phenol.
OPTICS AND LASER TECHNOLOGY
(2024)
