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Miniature Fiber-Optic Magnetic Field Sensor Based on Ampere Force and Fiber Laser

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Photonic Sensors 2020年第4期10卷 291-297页

作者： Weiren CHENG Tianming LUO Linghao CHENG Hao LIANG BAI-ou GUAN Institute of Photonics Technology Jinan UniversityGuangzhou 510632China

A compact fiber-optic magnetic field sensor is proposed by packaging an orthogonal dual-frequency fiber grating laser and a copper wire with alternating electrical current together inside epoxy resin.The alternating current generates Ampere force in a magnetic field,which changes the birefringence of the fiber laser and hence tunes the frequency of the beat signal after photodetection.The magnetic flux density can then be detected by measuring the frequency change of the beat signal.The sensitivity of the sensor can be tuned with a maximum response of 35.21 kHz/kGs demonstrated.Moreover,the sensor shows good immunity to environment interference.

关键词： Fiber laser optical magnetic field sensors fiber-optic sensors Ampere force

Free-moving-state microscopic imaging of cerebral oxygenation and hemodynamics with a photoacoustic fiberscope

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Light(Science & Applications) 2024年第1期13卷 33-46页

作者： Xiaoxuan Zhong Yizhi Liang Xiaoyu Wang Haoying Lan Xue bai Long Jin BAI-ou GUAN guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Institute of Photonics TechnologyJinan UniversityGuangzhou510632China

We report the development of a head-mounted photoacoustic fiberscope for cerebral imaging in a freely behaving mouse.The 4.5-gram imaging probe has a 9-µm lateral resolution and 0.2-Hz frame rate over a 1.2-mm wide area.The probe can continuously monitor cerebral oxygenation and hemodynamic responses at single-vessel resolution,showing significantly different cerebrovascular responses to external stimuli under anesthesia and in the freely moving state.For example,when subjected to high-concentration CO_(2) respiration,enhanced oxygenation to compensate for hypercapnia can be visualized due to cerebral regulation in the freely moving state.Comparative studies exhibit significantly weakened compensation capabilities in obese rodents.This new imaging modality can be used for investigating both normal and pathological cerebrovascular functions and shows great promise for studying cerebral activity,disorders and their treatments.

关键词： cerebral anesthesia moving

Compact Dual-Frequency Fiber Laser Accelerometer With Sub-μg Resolution

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光子传感器：英文版 2016年第2期6卷 115-120页

作者： Qian CAO Long JIN Yizhi LIANG Linghao CHENG BAI-ou GUAN guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Institute of PhotonicsTechnology Jinan University Guangzhou 510632 China

我们表明一个协议和高分辨率的双极化的纤维激光加速表。象计划一样的一个春天团被修理到 transduce 的激光洞上的质量使用了颤动进敲击频率变化的一个 10 克证明构造。装载在 intracavity 光的紧张最大值被定位最大化光反应。察觉限制... 详细信息

我们表明一个协议和高分辨率的双极化的纤维激光加速表。象计划一样的一个春天团被修理到 transduce 的激光洞上的质量使用了颤动进敲击频率变化的一个 10 克证明构造。装载在 intracavity 光的紧张最大值被定位最大化光反应。察觉限制在 200 Hz 到达 107 ng/Hz 1/2 。工作带宽从 60 Hz 到 600 Hz。

关键词：加速度计光纤激光紧凑型双频质量计划高分辨率光学响应双偏振

Flexible microbubble-based Fabry-Pérot cavity for sensitive ultrasound detection and wide-view photoacoustic imaging

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Photonics Research 2020年第10期8卷 1558-1565页

作者： JUN MA YANG HE XUE bai LI-PENG SUN KA CHEN KYUNGHWAN OH BAI-ou GUAN guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Institute of Photonics TechnologyJinan UniversityGuangzhou 511443China Photonic Device Physics Laboratory Department of PhysicsYonsei UniversitySeoul 033722South Korea

Interaction of acoustic waves and microbubbles occurs in numerous biomedical applications including ultrasound imaging,drug delivery,lithotripsy treatment,and cell manipulation,wherein the acoustically driven microbub-blcs routincly act as active microscale oscillators or actuators.In contrast,microbubbles were utilized here as passive reccivers to detect broadband ultrasound waves in aqueous environments.The microbubble was photo-thermally generated on a microstructured optical fiber(MOF)tip,forming a flexible Fabry-Perot cavity whose gas-water interface was sensitive to ultrasound waves.The MOF severed as both a low-loss waveguide and a compact light condenser,allowing high-efficiency generation and stabilization of ultrasmall microbubbles.Integrated with all-fiber interferometry,a 10 um diameter microbubble exhibited a low noise-cquivalcnt pressur elevei of^3.4 mPa/Hz^1/2 and a broad bandwidth of^0.8 MHz,capable of detecting weak ultrasounds emittedfrom red blood cells irradiated by pulsed laser light.With advantages of high sensitivity,compact size,and low cost,the microbubble-based ultrasound sensor has great potential in biomedical imaging and sensing applications.

关键词： microstructure bubble cavity

Fiber‑Optic Microfiber:Tracking Activity Enhancement and Suppression of Heterogeneous Photocatalysts

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Advanced Fiber Materials 2023年第2期5卷 527-542页

作者： Yunyun Huang Jiaxuan Liang Pengwei Chen Jiaxin Wan Haotian Wu Xiaolan Wu Aoxiang Xiao bai‑ou guan Jinan University Guangzhou 511400China guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Institute of Photonics TechnologyJinan UniversityGuangzhou 511443China

Obtaining detailed insight into the photocatalytic performance of heterogeneous photocatalytic materials,is important for evaluating material properties as well as guiding material design.However,capture of the detailed matter changes on a photocatalyst surface in real time,and in situ during photocatalysis remains challenging.This work reports a promising optical microfiber sensor integrating a photocatalytic reaction monolayer on an optical microfiber surface to monitor reaction kinetics using Cu_(2)O-based heterogeneous photocatalysts,as an example.The evanescent field of microfiber is used to track the photocatalytic process in real time,through the interaction with the catalytic layer,by monitoring the surface refractive index changes caused by adsorption and degradation.Since the catalytic layer is less than 1µm thick,the typical high-power light source can be replaced by low-power light irradiation.This method successfully reveals that relative to the pristine Cu_(2)O microspheres,the photocatalytic activity is enhanced by the incorporation of Ti_(3)C_(2)T_(x) MXene into Cu_(2)O,whereas incorporation of CdS into Cu_(2)O suppresses the activity.Compared with the existing methods used for photocatalysis evalu-ation,this optical microfiber can be directly employed in real matrices to track local photocatalytic performance.It can also provide details about the different adsorption/degradation kinetics of photocatalysts.It is suitable for most photocatalytic processes and is not limited to pollutants with characteristic UV–visible absorption spectra.This study provides important inspiration for the future development of in situ,real-time reaction assessment.

关键词： Photocatalysis around microfiber Tracking Heterogeneous photocatalysts Activity enhancement Suppression

Polarimetric parity-time symmetry in a photonic system

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Light(Science & Applications) 2020年第1期9卷 390-397页

作者： Lingzhi Li Yuan Cao Yanyan Zhi Jiejun Zhang Yuting Zou Xinhuan Feng BAI-ou GUAN Jianping Yao guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Institute of Photonics TechnologyJinan UniversityGuangzhou 511442China Microwave Photonics Research Laboratory School of Electrical Engineering and Computer ScienceUniversity of OttawaOttawaON K1N 6N5Canada

Parity-time(PT)symmetry has attracted intensive research interest in recent years.PT symmetry is conventionally implemented between two spatially distributed subspaces with identical localized eigenfrequencies and complementary gain and loss coefficients.The implementation is complicated.In this paper,we propose and demonstrate that PT symmetry can be implemented between two subspaces in a single spatial unit based on optical polarimetric diversity.By controlling the polarization states of light in the single spatial unit,the localized eigenfrequencies,gain,loss,and coupling coefficients of two polarimetric loops can be tuned,leading to PT symmetry breaking.As a demonstration,a fiber ring laser based on this concept supporting stable and single-mode lasing without using an ultranarrow bandpass filter is implemented.

关键词： polarization symmetry Polar

Low-Frequency Vibration Measurement by a Dual-Frequency DBR Fiber Laser

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Photonic Sensors 2017年第3期7卷 206-210页

作者： Bing ZHANG Linghao CHENG Yizhi LIANG Long JIN Tuan GUO BAI-ou GUAN guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Institute of Photonics Technology Jinan University Guangzhou 510632 China

双频率的分布式的布拉格反射镜(DBR ) 纤维激光基于传感器通过 Doppler 效果为低频率的颤动测量被表明。建议传感器的反应是相当线性的并且比一张常规加速表的高得多。建议传感器能工作在下面到有高敏感的 1 Hz。因此，建议传感器在低... 详细信息

双频率的分布式的布拉格反射镜(DBR ) 纤维激光基于传感器通过 Doppler 效果为低频率的颤动测量被表明。建议传感器的反应是相当线性的并且比一张常规加速表的高得多。建议传感器能工作在下面到有高敏感的 1 Hz。因此，建议传感器在低频率的颤动测量是很有效的。

关键词：光纤激光器振动测量 DBR 双频率低频激光传感器分布布拉格反射多普勒效应

Arbitrary polarization conversion dichroism metasurfaces for all-in-one full Poincare sphere polarizers

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Light(Science & Applications) 2021年第2期10卷 208-216页

作者： Shuai Wang Zi-Lan Deng Yujie Wang Qingbin Zhou Xiaolei Wang Yaoyu Cao BAI-ou GUAN Shumin Xiao Xiangping Li guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Institute of Photonics TechnologyJinan University510632 GuangzhouChina Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System Harbin Institute of Technology518055 ShenzhenChina Institute of Modern Optics Nankai University300350 TianjinChina

The control of polarization,an essential property of light,is of broad scientific and technological interest.Polarizers are indispensable optical elements for direct polarization generation.However,arbitrary polarization generation,except that of common linear and circular polarization,relies heavily on bulky optical components such as cascading linear polarizers and waveplates.Here,we present an effective strategy for designing all-in-one full Poincare sphere polarizers based on perfect arbitrary polarization conversion dichroism and implement it in a monolayer all-dielectric metasurface.This strategy allows preferential transmission and conversion of one polarization state located at an arbitrary position on the Poincare sphere to its handedness-flipped state while completely blocking its orthogonal state.In contrast to previous methods that were limited to only linear or circular polarization,our method manifests perfect dichroism of nearly 100%in theory and greater than 90%experimentally for arbitrary polarization states.By leveraging this attractive dichroism,our demonstration of the generation of polarization beams located at an arbitrary position on a Poincare sphere directly from unpolarized light can substantially extend the scope of meta-optics and dramatically promote state-of-the-art nanophotonic devices.

关键词： surface. Poincare arbitrary

Flexible fiber-laser ultrasound sensor for multiscale photoacoustic imaging

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Opto-Electronic Advances 2021年第8期4卷 16-29页

作者： BAI-ou GUAN Long Jin Jun Ma Yizhi Liang Xue bai guangdong Provincial Key Laboratory of Fiber Optic Sensing and Communications Institute of Photonics TechnologyJinan UniversityGuangzhou 511443China

Photoacoustic imag ing(PAI)is a nonin vasive biomedical imag ing tech no logy capable of multiscale imag ing of biological samples from orga ns dow n to cells.Multiscale PAI requires differe nt ultraso und tra nsducers that are flat or focused because the current widely-used piezoelectric transducers are rigid and lack the flexibility to tune their spatial ultrasound responses.Inspired by the rapidly-developing flexible photonics,we exploited the inherent flexibility and low-loss features of optical fibers to develop a flexible fiber-laser ultrasound sensor(FUS)for multiscale PAI.By simply bending the fiber laser from straight to curved geometry,the spatial ultraso und resp onse of the FUS can be tuned for both wide-view optical-resolution photoacoustic microscopy at optical diffraction-limited depth(~1 mm)and photoacoustic computed tomography at optical dissipation-limited depth of several centimeters.A radio-frequency demodulation was employed to get the readout of the beat frequency variation of two orthogonal polarization modes in the FUS output,which ensures low-noise and stable ultrasound detection.Compared to traditional piezoelectrical transducers with fixed ultrasound responses once manufactured,the flexible FUS provides the freedom to design multiscale PAI modalities including wearable microscope,intravascular endoscopy,and portable tomography system,which is attractive to fundamental biologic-al/medical studies and clinical applications.

关键词： flexible ultrasound transducer fiber-laser ultrasound sensor multiscale photoacoustic imaging photoacoustic microscopy photoacoustic computed tomography