Article
Engineering, Electrical & Electronic
Lishuai Zhao, Guoqiang Li, Jiulin Gan, Zhongmin Yang
Summary: The flexible hydrogel optical fiber with a permeable core/clad structure and a step-index profile is designed for efficient light guiding and fluorescence emission. It shows great potential for real-time, highly sensitive detection of pH in aqueous environments through integration of fluorescent materials as pH probes. This design eliminates external disturbances and allows linear responses over a wide pH range.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Chemistry, Analytical
Chao Wang, Xianhao Zhao, Kaiyu Wu, Shuyi Lv, Chunlei Zhu
Summary: Sensing temperature is crucial for understanding physiological and pathological processes. However, highly sensitive temperature sensing with organic fluorescent nanothermometers is challenging. In this study, a ratiometric fluorescent nanogel thermometer is developed to determine bactericidal temperature. The nanogel exhibits reversible spectral changes based on its hydrophilic-to-hydrophobic transition, and its emission intensity can be correlated to external temperature. The nanogel shows promise in predicting photothermal antibacterial effects and other temperature-related biological events.
Article
Engineering, Electrical & Electronic
Fuxing Zhu, Yundong Zhang, Weiguo Jiang, Yanchen Qu, Kaiyue Qi, Ying Guo
Summary: A highly sensitive hybrid structure sensor based on suspended-core fiber is developed for vector curvature and temperature measurement. The sensor overcomes the blind spots in bending sensitive dual-fiber sensing and maintains a smaller size and more flexible preparation. It shows high curvature and temperature sensitivity, making it suitable for various applications, such as artificial intelligence and medical detection.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
Jie Luo, Zhuohao Xiao, Lingwei Zeng, Jing Liu, Guannan Li, Chunmei Li, Hong He, Lei Zhou, Jun Yang, Jianfeng Tang
Summary: Ratiometric luminescence thermometry is a promising method for non-contact and non-invasive thermometry. A novel transparent germanate glass-ceramic material containing nanocrystals was developed to enhance the temperature sensitivity. The material showed high resolution and repeatability, making it suitable for fiber-optic thermometers.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Analytical
Daniel A. May-Arrioja, Miguel A. Fuentes-Fuentes, Ivan Hernandez-Romano, Rodolfo Martinez-Manuel, Natanael Cuando-Espitia
Summary: This paper presents a ratiometric approach to sensing temperature variations using specialty fiber optic devices. By analyzing the transmission response of cascaded segments of multicore fibers (MCFs), it was found that dissimilar lengths can generate an adequate scheme for ratiometric operation. The perturbation of optical parameters in the MCFs results in a rich spectral behavior, allowing for highly sensitive ratiometric measurements.
Article
Engineering, Electrical & Electronic
Huibo Fan, Cong Lu, Hui He, Li Fan, Haitao Chen
Summary: An ultracompact graphene-coated twisted silica taper is fabricated and applied for highly sensitive sensing and all-optical modulation. The coated graphene enhances the temperature sensing by its fast thermal response and the production and confinement of more propagating modes through the surface plasmon polariton (SPP) effect in the twisted taper. The enhanced multimode interference improves the optical sensitivities for temperature and strain sensing. Additionally, the proposed taper exhibits a significant resonant wavelength shift for all-optical modulation.
IEEE SENSORS JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Ada Fort, Marco Mugnaini, Enza Panzardi, Valerio Vignoli, Florian Doetzer, Klaus Stefan Drese
Summary: This study proposes the feasibility of a UV photoacoustic gas sensing system using an innovative resonant PA cell structure. The system design utilizes a ring-shaped cell with optimized characteristics to meet the requirements of the target application. The system is made up of low-cost and commercially available components, allowing for scalable monitoring of different gas species. Experimental evaluation of the system shows a relative sensitivity of 0.38%/ppm for NO2 and a LOD of 500 ppb, with response and recovery times in the order of seconds. The cross-sensitivity of the sensor to CO, CH4, and NH3 was also evaluated.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Engineering, Electrical & Electronic
Hou-Chang Li, Yuan-Kui Leng, Yun-Cheng Liao, Bin Liu, Wei Luo, Juan Liu, Jiu-Lin Shi, Jinhui Yuan, Heng-Yi Xu, Yong-Hua Xiong, Xing-Dao He, Qiang Wu
Summary: This article introduces a new double-taper microfiber Mach-Zehnder interferometer biosensor for Staphylococcus aureus detection. The sensor has a simple structure configuration, high sensitivity, good repeatability and specificity, wide detection range, and fast detection response time. It shows great potential in applications such as food safety inspection, biochemical sensing, diseases, and medical diagnostics.
IEEE SENSORS JOURNAL
(2022)
Article
Engineering, Electrical & Electronic
Sanfeng Gu, Danqi Feng, Tianheng Zhang, Shudan Deng, Meng Li, Yiwen Hu, Wei Sun, Ming Deng
Summary: A taper-based in-line Mach-Zehnder interferometer coated with magnetic fluids was designed and experimentally verified for highly sensitive magnetic field measurement. By analyzing the effect of waist diameter on transmission modes and proposing a cascaded MZI based on the Vernier effect, the sensitivity of magnetic field measurement was significantly enhanced. The proposed device may have broad applications in magnetic field measurement due to its high sensitivity, low cost, small volume, and simple fabrication.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Chemistry, Physical
Wanlai Zhu, Feng Xu, Zao Yi, Shubo Cheng, Hua Yang, Xianwen Wu, Gongfa Li, Liangcai Zeng, Zhenfang Yu, Hailiang Li
Summary: To improve the fabrication difficulty and sensing performance of optical fiber sensors, this study introduced surface plasmon resonance (SPR) effect and designed an eccentric-core photonic crystal fiber (EC-PCF). The study investigated the characteristics of different modes and the influence of structural parameters on the sensing performance, achieving a high refractive index sensitivity and resolution. Tests with different sensing types demonstrated the excellent performance of EC-PCF, providing a new and easily fabricated design idea for optical fiber sensing.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Tulika Khanikar, Vinod Kumar Singh
Summary: In this paper, a linear three hole microstructured optical fiber surface plasmon resonance sensor is proposed for temperature and refractive index (RI) detection. The sensor exhibits simple structure and competitive sensing performance, making it potentially useful for sensing high RI analytes in the petroleum and chemical industry and for magnetic field and temperature measurement.
Article
Chemistry, Physical
Shaoshuai Zhou, Wei Wang, Xiantao Wei, Min Yin
Summary: By employing a time-gated ratiometric thermometry technique, the temperature was measured based on the luminescence intensity ratio. Sm3+ doped material was used as the temperature responsive signal and reference signal. The experimental results showed high relative sensitivity and good temperature measurement performance within the investigated temperature range.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Analytical
Shiyi Xie, Cong Zhu, Lijuan Yang, Huiyi Li, Haizhen Zhu, Zhou Nie, Chunyang Lei
Summary: This study presents a ratiometric electrochemical sensor that detects viral proteases with high sensitivity by integrating target proteolysis-activated in vitro transcription and a DNA-functionalized electrochemical interface. The sensor demonstrated robust and specific NS3/4A protease sensing with sub-femtomolar sensitivity, and showed potential for developing direct-acting antivirals and novel therapies for viral infections.
ANALYTICAL CHEMISTRY
(2023)
Article
Engineering, Electrical & Electronic
Kaiming Yang, Bonan Liu, Changrui Liao, Yongxue Wang, Zhihao Cai, Jian Tang, Yatao Yang, Yiping Wang
Summary: The sensor proposed in this study is based on PBP-FBG and utilizes spectrum loss, Bragg dip shifts, and cut-off mode shift to measure surrounding liquid level, temperature, and refractive index respectively. It provides a simple and reliable method for accurate measurements in hazardous environments.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Adrian Sanchez Visedo, Jorge Losada Matias, Ana Soldado Cabezuelo, Jose Manuel Costa Fernandez, Maria Teresa Fernandez Arguelles, Marta Valledor Llopis, Juan Carlos Campo Rodriguez, Francisco Javier Ferrero Martin
Summary: A novel fiber-optic prototype has been designed for selective and sensitive miRNA detection. The output light power is automatically adjusted to minimize differences in brightness and potential losses. The prototype has been validated for the detection of miRNAs identified as biomarkers of bovine mastitis.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2022)
Article
Chemistry, Applied
Wei Xu, Xin Zhu, Di Zhao, Longjiang Zheng, Fengkai Shang, Zhiguo Zhang
Summary: This study presents a luminescence ratiometric thermometry technique that achieves high sensitivity and low measurement uncertainty by using a mixture of phosphors and optimizing the dopant concentration of rare earth ions, showing great potential in temperature measurement.
JOURNAL OF RARE EARTHS
(2022)
Article
Materials Science, Ceramics
Zhaoxin Zhong, Biao Zhang, Jian Ye, Ye Gao, Qiang Liu, Zhiguo Zhang, Feng Ye
Summary: In this study, porous SiC/Ti3SiC2 ceramic composites were prepared with enhanced electrical conductivity through nano-laminated Ti3SiC2, and achieved good thermal conductivity through in-situ formed nano beta-SiC and raw coarse alpha-SiC in the porous ceramics. The permeability, thermal, and electrical conductivity of the porous SiC/Ti3SiC2 ceramics were improved by adjusting the initial alpha-SiC particle size.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Biao Zhang, Zhaoxin Zhong, Jiaqi Tang, Jian Ye, Feng Ye, Zhiguo Zhang, Qiang Liu
Summary: In this research, a series of three-dimensional architectures formed by SiC nanowires with different microstructures were fabricated to enhance the low-frequency wave absorption ability. The bamboo-shaped SiC nanowires in the felt increased the permittivity and conductivity loss and produced multiple scattering effects on the incident EM waves. The density of the SiC nanowire felt was as low as 0.022 g/cm3 due to the high porosity of 3D networks, fulfilling the requirements of lightweight and efficient electromagnetic wave absorption.
CERAMICS INTERNATIONAL
(2023)
Article
Optics
Wei Xu, Shuning Zong, Fengkai Shang, Longjiang Zheng, Zhiguo Zhang
Summary: This paper proposes a strategy to implement effective luminescence nanothermometry by utilizing the different thermal responses between Yb3+ -> Nd3+ and Nd3+ -> Yb3+ energy transfer processes. Unlike the traditional ratiometric sensing method, this technique uses intensity ratios between Yb3+ and Nd3+ near-IR emissions as the detecting and reference signals for temperature measurement, showing excellent immunity to interference and high thermal sensitivity.
PHOTONICS RESEARCH
(2022)
Article
Physics, Applied
Jiaming Li, Xudong Qi, Kai Li, Ming Lu, Zhaoliang Yu, Duo Wang, Shichong Xu, Enwei Sun, Zhiguo Zhang
Summary: A photoluminescence (PL) method is proposed to characterize the phase transition processes of Li+/Er3+:BaTiO3 (BLET) ferroelectric ceramics using infrared fluorescence intensities. The fluorescence intensities are used to detect the phase transition of BLET ceramics in multiple phase transition regions. The change in fluorescence intensities at the phase transition is attributed to a variation in the radiative transition probability of the I-4(13/2) level. By elucidating the relationship between fluorescence properties and the phase structure, our research contributes to a better understanding of the PL characteristics and phase structure of ferroelectric materials, and further enhances the application potential of PL methods in the detection of ferroelectric phase transition.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Physical
Meng Kou, Feng Qin, Yongda Wang, Xiyu Zhang, Zheng Hu, Zhiguo Zhang
Summary: Environmental heavy atoms can enhance the room temperature phosphorescence emissions of Gd-HMME through the external heavy atom effect. In this study, a method is used to separate the external effect from the total effect and to define a quantity that describes the intrinsic nature of the external effect. The phosphorescent transition rate (kP) increases linearly with the environmental Gd3+ concentration, while the slope kappa is independent of Gd3+ concentration and only depends on the type of environmental heavy atoms.
JOURNAL OF PHYSICAL CHEMISTRY B
(2023)
Article
Engineering, Multidisciplinary
Yongda Wang, Feng Qin, Honglin Zhang, Meng Kou, Zhiguo Zhang
Summary: A high-performance oxygen sensor is developed using room temperature phosphorescence. The sensor probe is made of Sol-gel matrix doped with Palladium (II) octaethylporphyrin (PdOEP) and has a sensitivity of 29.23 kPa(-1). The sensor incorporates a dual-channel structure to eliminate excitation source fluctuations and uses a photomultiplier tube equipped photon counter to enhance the signal-to-noise ratio. The detection limit of the system is 0.1 Pa with an indication error of +/- 1.5%.
Article
Optics
Lixin Peng, Changwen Wang, Leipeng Li, Feng Qin, Zhiguo Zhang
Summary: This study presents a ratiometric optical thermometry based on upconversion luminescence using different multi-photon processes. It proposes a new fluorescence intensity ratio thermometry that utilizes the ratio of specific emissions of Tm3+ and maintains anti-interference against excitation light fluctuations. The validity of the thermometry is confirmed through testing and analyzing emission spectra at different temperatures. The results demonstrate the feasibility and sensitivity of the ratiometric thermometry, providing guidance for selecting suitable upconversion luminescence materials for constructing anti-interference optical thermometers.
Article
Optics
Zhiyang Sun, Yongda Wang, Zhiguo Zhang
Summary: The study investigates the impact of port fraction on the radiant flux of an integrating cavity and establishes a theoretical model for light propagation in an arbitrary-shaped cavity. The relationship between port fraction, radiant flux, and diffuse reflectance is derived and experimentally validated in the absence of gas absorption. A method for measuring the diffuse reflectance of the integrating cavity is proposed, which effectively minimizes the influence of light source fluctuations on the measurement.
APPLIED PHYSICS B-LASERS AND OPTICS
(2023)
Article
Optics
Junqi Cui, Wei Xu, Miao Yao, Longjiang Zheng, Chunhai Hu, Zhiguo Zhang, Zhen Sun
Summary: A novel strategy using convolutional neural network for luminescence thermometry is proposed, which can autonomously select and extract multiple temperature-dependent features for regression temperature calculation, fully utilizing the temperature-dependent spectral data. Compared with traditional ratiometric technology and multiple linear regression method, the proposed method exhibits significantly higher accuracy, indicating the potential of deep learning in the field of luminescence thermometry.
JOURNAL OF LUMINESCENCE
(2023)
Article
Chemistry, Physical
Meng Kou, Feng Qin, Weiming Lu'', Zheng Hu, Zhiguo Zhang
Summary: Modern photodynamic therapy relies on the interaction between photosensitizer and oxygen to produce singlet oxygen. Energy transfer from the triplet excited state of photosensitizer to the excited state of oxygen is well-established, while the transfer from the singlet excited state is believed to be insignificant. However, our study provides evidence of energy transfer between the singlet excited state and oxygen in the production of singlet oxygen. This finding has been verified through fluorescence intensity measurements and ultrafast pump probe experiments.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Engineering, Mechanical
Ye Yuan, Bin Liu, Han Jia, Chi Zhang, Zhiguo Zhang, Suhao Wang, Yuzhen Yang, Xun Wang, Xiaobin Cheng, Zhaoli Yan, Jun Yang
Summary: This article introduces a nondestructive testing method based on honeycomb structure. By analyzing and experimental testing, it is found that there is a special wave propagation gap in the honeycomb structure, which can be used to detect debonding defects. This method detects and locates the debonding defects in the honeycomb structure with high sensitivity and efficiency, and it has great potential to be widely used in field tests.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Materials Science, Ceramics
Wei Xu, Fengze Bai, Longjiang Zheng, Chunhai Hu, Zhiguo Zhang, Yungang Zhang, Zhen Sun
Summary: By doping Ga3+ in garnet-structured phosphors, the upconversion luminescence can be significantly enhanced, leading to color switching in response to temperature change.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Meng Kou, Feng Qin, Yongda Wang, Xiyu Zhang, Zheng Hu, Hua Zhao, Zhiguo Zhang
Summary: In this study, a method was proposed to accurately determine the Stern-Volmer constant (K(SV)) of the photosensitizer by measuring the oxygen-dependent consumption of 1,3-diphenylisobenzofuran. The consumption time (Δ) was introduced as a measurable quantity and obtained from the absorption spectrum with a high signal-to-noise ratio. Experimentally, rose Bengal and metalloporphyrin were used to validate this method, and the K(SV) values obtained were 43(1) kPa(-1) and verified the accuracy of this method.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Analytical
Xinyu Ai, Yungang Zhang, Zhiguo Zhang
Summary: High-sensitivity trace oxygen sensing based on far-ultraviolet absorption spectroscopy was achieved in this study. The optimal wavelength range for accurate and sensitive oxygen measurements was determined, and a calibration curve for oxygen was established. The detection sensitivity and lowest detection limit were also determined, indicating significant potential for application.
