Article
Optics
Jingyu Mo, Xuefeng Chang, Duoji Renqing, Jian Liu, Shanming Luo
Summary: This study presents the design and fabrication of a novel double-sided aspherical Fresnel lens on a curved substrate to address the issues of long focal length and large volume associated with traditional Fresnel lenses. The study also proposes a combined method of single-point diamond turning and press molding for manufacturing the lens, which proves to be cost-effective and suitable for mass production. The results demonstrate that the novel DSAF lens offers advantages such as increased design flexibility, shorter focal length, smaller volume, and improved light-gathering capabilities.
Article
Engineering, Electrical & Electronic
Manyu Liu, Fan Zhang, Cong Xu, Zhu Ma, Shunshun Zhong, Ji'an Duan
Summary: An experimental and theoretical study is conducted on an optical coupling system consisting of a laser diode, aspherical lens, and GRIN fiber. The effects of various factors on coupling efficiency are systematically investigated, and the study provides insights on optimizing the launch optics for designing and fabricating GRIN fiber coupled packaging of optoelectronic devices.
OPTICAL FIBER TECHNOLOGY
(2022)
Review
Chemistry, Inorganic & Nuclear
Yong Zhao, Yingxuan Liu, Bo Han, Mingyue Wang, Qi Wang, Ya-nan Zhang
Summary: Most VOCs are harmful to human health and the environment, thus the need for their detection and identification in both indoor and outdoor environments is urgent. Fiber optic sensors offer new approaches to overcome the limitations of conventional gas sensing systems, as they are intrinsically safe, portable, immune to electromagnetic interference, and easy to use for remote sensing and multiplexing. This review assesses recent advances in fiber optic VOC gas sensors, including sensing principles, gas-responsive materials, sensing material deposition techniques, structures, and applications.
COORDINATION CHEMISTRY REVIEWS
(2023)
Article
Engineering, Electrical & Electronic
Siyu Lin, Yundong Zhang, Yanchen Qu, Fan Wang, Xiaopeng Han
Summary: In this paper, a miniature high-temperature fiber-optic sensor based on tip-packaged Fabry-Perot interferometer is proposed and demonstrated. The sensor is insensitive to changes in external refractive index and maintains good temperature sensing characteristics. Two packaging methods, using hollow core fiber (HCF) or single mode fiber (SMF), are proposed. The temperature sensitivities of these sensors increase due to the non-linear thermo-optic coefficient (TOC) of silicon. The repeatability and stability of the sensors are verified, making them suitable for practical engineering applications.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Engineering, Electrical & Electronic
Hui Zhang, Jing Kang, Meng Zhang, Chuanxu Liu, Jiuru Yang
Summary: A novel micro-cavity based Mach-Zehnder interferometer is proposed in this paper, achieving high sensitivity and detection resolution for axial strain monitoring and temperature sensing.
IEEE SENSORS JOURNAL
(2021)
Article
Optics
Conghao Wang, Huilan Liu, Jianrui Ma, Qiang Fu, Yijun Li, Yanchuan Chen, Yuqian Gao, Jingquan Tian, Xinlei Luo, Fei Yu, Chunzhu Zhao, Runlong Wu, Aimin Wang, Lishuang Feng
Summary: This study presents a lensed fiber-optic two-photon endomicroscopy technique that does not require an objective lens, providing a larger field of view for in situ imaging and diagnosis at subcellular resolution. The probe has a field of view of 750 μm with a resolution of 3.03 μm, and has a small size and lightweight design, making it suitable for imaging both ex vivo and in vivo tissues.
Article
Engineering, Electrical & Electronic
Wenting Yang, Wei Wang, Haibin Chen, Xiongxing Zhang, Zilong Guo, Junying Zhang
Summary: A highly sensitive fiber-optic curvature sensor based on SMF and HCF has been proposed in this study, which can achieve high sensitivity measurement within a certain curvature range and exhibit low-temperature sensitivity.
OPTICAL FIBER TECHNOLOGY
(2021)
Article
Engineering, Biomedical
Yinan Den, Tangwen Yang, Shaotao Dai, Guoli Song
Summary: The study designed and evaluated a miniature triaxial fiber optic sensor for measuring contact force during ureteroscopy. The sensor demonstrated precise measurement in both axial and lateral directions, establishing its excellent performance and reliability.
IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING
(2021)
Article
Physics, Applied
Kun Wang, Yosuke Mizuno, Xingyu Su, Xingchen Dong, Wolfgang Kurz, Maximilian Fink, Heeyoung Lee, Martin Jakobi, Alexander W. Koch
Summary: Modal interference in a multimode fiber has been used to develop simple sensors for various physical parameters. The study investigated the effects of the core diameter and numerical aperture on the performance of strain and temperature sensing based on multimode interference. It was found that larger core diameter resulted in higher temperature sensitivity but lower strain sensitivity, while higher numerical aperture increased strain sensitivity. Strain-insensitive temperature sensing was demonstrated using low strain sensitivity, with a sensitivity of approximately 6.1 pm/°C.
APPLIED PHYSICS EXPRESS
(2023)
Article
Engineering, Electrical & Electronic
Zahra Akbarpour, Vahid Ahmadi, Farzaneh Arabpour Roghabadi
Summary: This paper presents an all-fiber Mach-Zehnder interferometer (MZI) sensor for refractive index (RI) measurement using Multimode-Single-mode-Multimode (MSM) fiber. The effects of reducing the radius of the sensing part and surface plasmon resonance (SPR) on efficiency are investigated. The sensitivity is significantly improved by increasing the interaction between high-order modes and external media through etching the cladding layer of the single-mode fiber part. Both wavelength and intensity interrogation methods are used to study the Multimode-etched Single-mode-Multimode (MESM) fiber sensor.
OPTICAL FIBER TECHNOLOGY
(2022)
Review
Chemistry, Analytical
Jose Rafael Guzman-Sepulveda, Rafael Guzman-Cabrera, Arturo Alberto Castillo-Guzman
Summary: This review focuses on fiber-based multimode interference (MMI) devices for sensing applications, particularly for nonconventional physical variables, covering mechanical, electromagnetic, chemical, and optical aspects, with around fifteen years of work in the field. Additionally, new trends of MMI-based schemes involving polymer fibers for wavelength-locking applications, retrieving the thermo-optic coefficient of liquid samples, and measuring the dynamics of complex fluids are also reviewed at the end of the paper.
Article
Optics
Dora Juan Juan Hu, Linbo Liu, Hui Dong, Hailiang Zhang
Summary: In this paper, an optical fiber-based broadband mode coupler for multimode optical coherence tomography (OCT) in the O-band is proposed. The device uses a tapered few-mode fiber (FMF) to achieve efficient mode coupling between the higher-order modes of the FMF and the fundamental mode of a single-mode fiber (SMF). Key design parameters such as the tapering ratio, core separation, coupler length, and coupling ratio in the O-band are thoroughly studied. The proposed fiber device allows for better signal collection and improved penetration depth in deep tissue imaging for multimode OCT.
Article
Engineering, Electrical & Electronic
Zhenfeng Gong, Haie Li, Xu Jiang, Guojie Wu, Tianli Gao, Min Guo, Fengxiang Ma, Ke Chen, Liang Mei, Wei Peng, Qingxu Yu
Summary: The silicon cantilever-based fiber-optic acoustic sensor has advantages of high sensitivity, small size, and good stability, showing linear response at different frequencies and a wide operating bandwidth.
IEEE SENSORS JOURNAL
(2021)
Article
Computer Science, Information Systems
Jun Zhou, Zichun Le, Zongshen Liu, Yanxin Dai, Yanyu Guo, Jiayu Deng, Jiapo Li
Summary: This study proposes a compound speckle reduction method that effectively reduces speckle contrast and achieves good spot quality by combining a vibrating multimode fiber and a tracked moving DOE loop. Experimental results are in good agreement with Goodman's speckle theory, indicating promising potential for applications in laser imaging systems.
Article
Engineering, Electrical & Electronic
Mohammad Istiaque Reja, Linh Nguyen, Heike Ebendorff-Heidepriem, Stephen C. Warren-Smith
Summary: In this study, we present a multipoint optical fiber pressure sensor for high temperature operation using multimode interference. The sensor consists of several sensing elements that are connected in series and demultiplexed using Fourier analysis. Each sensing element is made of a four-hole asymmetric multimode fiber and two standard polarization-maintaining single mode fibers. The sensor can operate at temperatures up to 900 degrees C and has potential applications in heavy industry for spatially resolved pressure measurements that can improve efficiency and safety.
OPTICAL FIBER TECHNOLOGY
(2023)
