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Spatiotemporal pulse weaving scalar optical hopfions

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Light(Science & Applications) 2023年第3期12卷 325-326页

作者： Chenhui Li Sicong Wang Xiangping Li guangdong provincial key laboratory of optical fiber sensing and communications Institute of Photonics TechnologyJinan UniversityGuangzhouChina

Scalar optical hopfions weaved by nested equiphase lines in the shape of a toroidal vortex are theoretically designed and experimentally *** category of hopfions manifesting as a spatiotemporally structured pulse propagating in space-time may enable encoding and transferring optical topological information in an additional(temporal)dimension.

关键词： pulse optical enable

Resonant enhancement of second harmonic generation in etchless thin film lithium niobate heteronanostructure

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Science China(Physics,Mechanics & Astronomy) 2022年第10期65卷 75-82页

作者： Zhijin Huang Kaiwen Luo Ziwei Feng Zhanyuan Zhang Yang Li Wentao Qiu Heyuan Guan Yi Xu Xiangping Li Huihui Lu guangdong provincial key laboratory of optical fiber sensing and communications Department of Optoelectronic EngineeringJinan UniversityGuangzhou 510632China guangdong provincial key laboratory of optical fiber sensing and communications Institute of Photonics TechnologyJinan UniversityGuangzhou 510632China guangdong provincial key laboratory of Information Photonics Technology Institute of Advanced Photonics TechnologySchool of Information EngineeringGuangdong University of TechnologyGuangzhou 510006China

Lithium niobate has received interest in nonlinear frequency conversion due to its wide transparency window,from ultraviolet to mid-infrared spectral regions,and large second-order nonlinear ***,its nanostructure is generally difficult to etch,resulting in low-Q resonance and lossy nanostructures for second harmonic *** applying the concept of bound states in the continuum,we performed theoretical and experimental investigations on high-Q resonant etchless thin-film lithium niobate with Si O_(2) nanostructures on top for highly efficient second harmonic *** the fabricated nanostructured devices,a resonance with a Q factor of 980 leads to the strong enhancement of second harmonic generation by over 1500 times compared with that in unpatterned lithium niobate thin *** the pump slightly deviates from central resonance,an absolute conversion efficiency of 6.87×10^(-7) can be achieved with the fundamental pump peak intensity of 44.65 MW/cm^(2),thus contributing to the normalized conversion efficiency of 1.54×10^(-5)cm^(2)/*** work establishes an etchless lithium niobate device for various applications,such as integrated nonlinear nanophotonics,terahertz frequency generation,and quantum information processing.

关键词： second harmonic generation etchless thin-film lithium niobate heteronanostructure high-Q resonance

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

fiber-Optic Biosensors for Cancer Theranostics:From in Vitro to in Vivo

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Photonic Sensors 2024年第4期14卷 42-73页

作者： Fangzhou JIN Zhiyuan XU Donglin CAO Yang RAN Bai-Ou GUAN guangdong provincial key laboratory of optical fiber sensing and communications Institute of Photonics TechnologyJinan UniversityGuangzhou 510632China Department of laboratory Medicine The Affiliated Guangdong Second Provincial General Hospital of Jinan UniversityGuangzhou 510317China

Cancer has been one of the most serious diseases,resulting in more than 10 million deaths every ***-optic sensors have great potential for diagnosing and treating cancer due to their flexibility,precise positioning,real-time monitoring,and minimally invasive *** to traditional central laboratory examination,fiber-optic biosensors can provide high sensitivity,miniaturization,and versatility,which feature the point-of-care diagnostic ***,we focus on recent advances in fiber-optic biosensors for cancer *** is primarily concerned with advancements in the design of various fiber sensing approaches,fiber cancer sensing,and therapy *** fiber-optic biosensors,cancer marker detection,cancerous cell differentiation,ex vivo tumor model validation,and in vivo tumor detection can be *** the medical fiber also can be used to provide photothermal therapy,photodynamic therapy,and combination therapy for solid ***,cancer sensing and therapy can be integrated into the fiber,which demonstrates the multiplexing capabilities of fiber-optic ***,we systematically summarize the fiber biosensor applications from in vitro to in vivo,and conclude with the challenges in development and prospects.

关键词： fiber-optic sensors cancer sensing cancer therapy cancer theranostics

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

Spin-orbit Rabi oscillations in optically synthesized magnetic fields

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Light(Science & Applications) 2023年第9期12卷 1930-1942页

作者： Guohua Liu Xiliang Zhang Xin Zhang Yanwen Hu Zhen Li Zhenqiang Chen Shenhe Fu Department of Optoelectronic Engineering Jinan UniversityGuangzhou 510632China guangdong provincial key laboratory of optical fiber sensing and communications Guangzhou 510632China guangdong provincial Engineering Research Center of Crystal and Laser Technology Guangzhou 510632China

Rabi oscillation has been proven to be one of the cornerstones of quantum mechanics,triggering substantial investigations in different disciplines and various important applications both in the classical and quantum *** far,two independent classes of wave states in the Rabi oscillations have been revealed as spin waves and orbital waves,while a Rabi wave state simultaneously merging the spin and orbital angular momentum has remained *** we report on the experimental and theoretical observation and control of spin–orbit-coupled Rabi oscillations in the higher-order regime of *** constitute a pseudo spin-1/2 formalism and optically synthesize a magnetization vector through light-crystal *** observe simultaneous oscillations of these ingredients in weak and strong coupling regimes,which are effectively controlled by a beam-dependent synthetic magnetic *** introduce an electrically tunable platform,allowing fine control of transition between different oscillatory modes,resulting in an emission of orbital-angular-momentum beams with tunable topological *** results constitute a general framework to explore spin–orbit couplings in the higher-order regime,offering routes to manipulating the spin and orbital angular momentum in three and four *** close analogy with the Pauli equation in quantum mechanics,nonlinear optics,etc.,implies that the demonstrated concept can be readily generalized to different disciplines.

关键词： field orbital momentum

Moving-window bis-correlation coefficients method for visible and near-infrared spectral discriminant analysis with applications

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Journal of Innovative optical Health Sciences 2018年第2期11卷 65-77页

作者： Lijun Yao Weiqun Xu Tao Pan Jiemei Chen guangdong provincial key laboratory of optical fiber sensing and communications Department of Optoelectronic Engineering Jinan University GuangzhouChina Department of Biological Engineering Jinan University GuangzhouChina

The moving window bis corelation coefficients(MW BiCC)was proposed and employed for the discriminant analysis of transgenic sugarcane leaves and B-thalassemia with visible and near-infrared(Vis NIR)*** well-performed moving window principal component analysis linear discriminant analysis(MWPCA-LDA)was also conducted for comparison.A total of 306 transgenic(positive)and 150 nont ransgenic(negative)leave samples of sugarcane were collected and divided to calibration,prediction,and *** diffuse reflection spectra were corected using Savitzky-Golay(SG)smoothing with first-order derivative(d=1),third-degree polynomial(p=3)and 25 smpothing points(m=25).The selected waveband was 736-1054nm with MW-BiCC,and the positive and negative validation recognition rates(V_REC^(+),VREC^(-))were 100%,98.0%,which achieved the same effect as *** example,the 93 B-thalassemia(positive)and 148 nonthalassemia(negative)of human hemolytic samples were *** transmission spectra were corrected using SG smoothing withd=1,p=3 and m=*** M W-BiCC,many best wavebands were selected(e.g.,1116-1146,17941848 and 22842342nm).The V_REC^(+)and V_REC^(-)were both 100%,which achieved the same effect as ***,the BICC only required ca lculating correlation cofficients between the spectrum of prediction sample and the average spectra of two types of calibration ***,BiCC was very simple in algorithm,and expected to obtain more *** results first confirmed the feasibility of distinguishing B-thalassemia and normal control samples by NIR spectroscopy,and provided a promising simple tool for large population thalassemia screening.

关键词： Visible and near infrared spectroscopic discriminant analysis transgenic sugarcane leaves B-thalassemia moving-window bis-correlation cofficients moving-window principal component analysis linear discriminant analysis.

One-step plasmonic welding and photolithographic patterning of silver nanowire network by UV-programable surface atom diffusion

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Nano Research 2022年第3期15卷 2582-2591页

作者： Gui-Shi Liu Ting Wang Yexiong Wang Huajian Zheng Yunsen Chen Zijie Zeng Lei Chen Yaofei Chen Bo-Ru Yang Yunhan Luo Zhe Chen guangdong provincial key laboratory of optical fiber sensing and communications Key Laboratory of Visible Light Communications of GuangzhouKey Laboratory of Optoelectronic Information and Sensing Technologies of Guangdong Higher Education InstitutesDepartment of Optoelectronic EngineeringJinan UniversityGuangzhou 510632China State key laboratory of Optoelectronic Materials and Technologies School of Electronics and Information TechnologySun Yat-Sen UniversityGuangzhou 510006China

Silver nanowire(AgNW)based transparent electrode(TE)plays a pivotal role in optoelectronics where TE is generally required to have fine pattern and high *** the rapid technological advances in either welding or patterning of AgNWs,there are few studies that combine the two processes in a simple and practical ***,aiming to fabricate high-performance patterned AgNW TE,we develop a simplified photolithography that enables both plasmonic nanowelding with low-level UV exposure(20 mW/cm^(2))and high-resolution micropatterning without photoresist and etching process by conjugating AgNW with diphenyliodonium nitrate(DPIN)and UV-curable *** cellulose as a binder can effectively enhance plasmonic heating,adhesion,and stability,while the photosensitive DPIN,capable of modulating surface atom diffusion,can boost the plasmonic welding at AgNW junction and induce patterning in AgNW network with Plateau-Rayleigh *** fabricated AgNW TE has high figure of merit of up to 1,000(3.7Ω/sq at 90%transmittance)and minimal pattern size down to 3µm,along with superior ***,a flexible smart window with high performance is demonstrated using the patterned and welded AgNW TEs,verifying the applicability of the simplified photolithography technique to optoelectronic devices.

关键词： silver nanowires plasmonic welding patterning Plateau-Rayleigh instability transparent electrodes

fiber laser technologies for photoacoustic microscopy

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Visual Computing for Industry,Biomedicine,and Art 2021年第1期4卷 91-103页

作者： Long Jin Yizhi Liang guangdong provincial key laboratory of fiber Optic sensing and communications Institute of Photonics TechnologyJinan UniversityGuangzhou 510632China

fiber laser technology has experienced a rapid growth over the past decade owing to increased applications in precision measurement and optical testing,medical care,and industrial applications,including laser welding,cleaning,and manufacturing.A fiber laser can output laser pulses with high energy,a high repetition rate,a controllable wavelength,low noise,and good beam quality,making it applicable in photoacoustic ***,recent developments in fiber-laser-based photoacoustic microscopy(PAM)are *** PAM can be used to image oxygen saturation or lipid-rich biological tissues by applying a Q-switched fiber laser,a stimulated Raman scattering-based laser source,or a fiber-based supercontinuum source for photoacoustic *** can also incorporate a single-mode fiber laser cavity as a high-sensitivity ultrasound sensor by measuring the acoustically induced lasing-frequency *** of their small size and high flexibility,compact head-mounted,wearable,or hand-held imaging modalities and better photoacoustic endoscopes can be enabled using fiber-laser-based PAM.

关键词： fiber lasers fiber sensors Photoacoustic imaging Photoacoustic microscopy