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Improvement in resolution of fiber-laser photoacoustic tomography based on a virtual-point concept

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Visual Computing for Industry,Biomedicine,and Art 2021年第1期4卷 22-28页

作者： Xue bai Xu Li Jun Ma bai-ou guan guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Institute of Photonics TechnologyJinan UniversityGuangzhou 511443China

In this study,a virtual-point concept was introduced into fiber-laser photoacoustic tomography to improve the elevational image *** flexible fiber laser was bent into an arc shape to conform to the ultrasound wavefront,which formed an ultrasound focus at the center of the *** synthetic aperture focusing technique was utilized to reconstruct the images;as a result,the elevational resolution particularly within the out-of-focus region was considerably improved compared to the resolution of an image retrieved by multiplexing the PA time-resolved signals with sound *** all-optical fiber-laser photoacoustic tomography system with a high spatial resolution has potential for various applications,including biomedical research and preclinical/clinical diagnosis.

关键词： Photoacoustic tomography Fiber laser Virtual point Synthetic aperture focusing

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 *** symmetry is conventionally implemented between two spatially distributed subspaces with identical localized eigenfrequencies and complementary gain and loss *** implementation is *** this paper,we propose and demonstrate that PT symmetry can be implemented between two subspaces in a single spatial unit based on optical polarimetric *** 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 *** 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

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 ***,capture of the detailed matter changes on a photocatalyst surface in real time,and in situ during photocatalysis remains *** 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 *** 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 *** the catalytic layer is less than 1µm thick,the typical high-power light source can be replaced by low-power light *** 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 *** with the existing methods used for photocatalysis evalu-ation,this optical microfiber can be directly employed in real matrices to track local photocatalytic *** can also provide details about the different adsorption/degradation kinetics of *** is suitable for most photocatalytic processes and is not limited to pollutants with characteristic UV–visible absorption *** 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

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 *** are indispensable optical elements for direct polarization ***,arbitrary polarization generation,except that of common linear and circular polarization,relies heavily on bulky optical components such as cascading linear polarizers and ***,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 *** 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 *** 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 *** 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

Efficiently Writing Bragg Grating in High-Birefringence Elliptical Microfiber for Label-Free Immunosensing with Temperature Compensation

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Advanced Fiber Materials 2021年第5期3卷 321-330页

作者： Peng Xiao Zhiyuan Xu Deming Hu Lili Liang Lipeng Sun Jie Li Yang Ran bai‑ou guan guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Institute of Photonics TechnologyJinan UniversityGuangzhou 510632China Ji Hua Laboratory Foshan 528300China Institute of Information Technology Handan UniversityHandan 056005China

Immunosensor is a powerful tool in healthcare and clinic,food and drug industry,and environmental ***-free fiber-optic immunosensors have shown a myriad of advantages,such as high sensitivity,anti-electromagnetic interference,and afield measurement via the fiber ***,the fiber-optic based sensor may bear the temperature cross-talk,especially under the warming condition for bio-activating the immune *** this study,we proposed a highly birefringent microfiber Bragg grating for immunosensing with the *** birefringent microfiber was drawn from the elliptical cladding multimode fiber that was ablated by the CO2 *** considerably large energy overlap region offered by the original multimode fiber favored the efficient inscription of FBG with high *** dual reso-nances derived by the orthogonal polarization states presented similar temperature responsivities but significantly different ambient refractive index sensitivities,allowing the temperature-compensational RI *** human immunoglobulin G(IgG)molecules were anchored on the surface of the microfiber grating probe by the covalent functionalization technique to enable the specific detection of the anti-IgG *** proposed method promises a high-efficiency and low-cost design for the microfiber Bragg grating-based biosensor without being subjected to the temperature cross-sensitivity.

关键词： Fiber-optic biosensors Microfiber Fiber Bragg grating Birefringence Temperature compensation Immunosensing

Dual-shot dynamics and ultimate frequency of all-optical magnetic recording on GdFeCo

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Light(Science & Applications) 2021年第1期10卷 98-105页

作者： Sicong Wang Chen Wei\Yuanhua Feng Hongkun Cao Wenzhe Li Yaoyu Cao bai-ou guan Arata Tsukamoto Andrei Kirilyuk Alexey VKimel Xiangping Li guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Institute of Photonics TechnologyJinan UniversityGuangzhou 510632China Institute for Molecules and Materials Radboud UniversityHeyendaalseweg 1356525 AJ NijmegenThe Netherlands Department of Electronic Engineering College of Information Science and TechnologyJinan UniversityGuangzhou 510632China Institute of New Energy Technology Department of Electronic EngineeringCollege of Information Science and TechnologyJinan UniversityGuangzhou 510632China College of Science and Technology Nihon University7-24-1 FunabashiChiba 274-8501Japan FELIX Laboratory Radboud UniversityToernooiveld 76525 ED NijmegenThe Netherlands

Although photonics presents the fastest and most energy-efficient method of data transfer,magnetism still offers the cheapest and most natural way to store *** ultrafast and energy-efficient optical control of magnetism is presently a missing technological link that prevents us from reaching the next evolution in information *** discovery of all-optical magnetization reversal in GdFeCo with the help of 100fs laser pulses has further aroused intense interest in this compelling *** the applicability of this approach to high-speed data processing depends vitally on the maximum repetition rate of the switching,the latter remains virtually *** we experimentally unveil the ultimate frequency of repetitive all-optical magnetization reversal through time-resolved studies of the dual-shot magnetization dynamics in Gd27 Fe63.87 *** the intensities of the shots and the shotto-shot separation,we reveal the conditions for ultrafast writing and the fastest possible restoration of magnetic *** is shown that although magnetic writing launched by the first shot is completed after 100 ps,a reliable rewriting of the bit by the second shot requires separating the shots by at least 300 *** two shots partially overlapping in space and minimally separated by 300 ps,we demonstrate an approach for GHz magnetic writing that can be scaled down to sizes below the diffraction limit.

关键词： magnetic dynamics recording

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 *** 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 *** 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 *** 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 *** 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

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 *** 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 *** magnetic flux density can then be detected by measuring the frequency change of the beat *** sensitivity of the sensor can be tuned with a maximum response of 35.21 kHz/kGs ***,the sensor shows good immunity to environment interference.

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

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

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Photonic Sensors 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

We demonstrate a compact and high-resolution dual-polarization fiber laser accelerometer. A spring-mass like scheme is constructed by fixing a 10-gram proof mass on the laser cavity to transduce applied vibration into beat-frequency change. The loading is located at the intensity maximum of intracavity light to maximize the optical response. The detection limit reaches 107 ng/Hz1/2 at 200 Hz. The working bandwidth ranges from 60 Hz to 600 Hz.

关键词： Dual-frequency fiber lasers fiber Bragg grating photonic accelerometers