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

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 susceptibility.However,its nanostructure is generally difficult to etch,resulting in low-Q resonance and lossy nanostructures for second harmonic generation.By 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 generation.In 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 film.Although 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)/GW.Our 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

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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 resolution.The 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 arc.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 velocity.The 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

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Observation of photoacoustic/photothermal effect with a liquid-core optical ring resonator

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Chinese Optics Letters 2017年第7期15卷 86-90页

作者：郭焕菁金龙马军关柏鸥 Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Institute of Photonics TechnologyJinan University

Photothermal/photoacoustic（PT/PA） spectroscopy provides useful knowledge about optical absorption, as well as the thermal and acoustical properties of a liquid sample. For microfluidic biosensing and bioanalysis where an extremely small volume of liquid sample is encapsulated, simultaneous PT/PA detection remains a challenge. In this work, we present a new optofluidic device based on a liquid-core optical ring resonator（LCORR） for the investigation of PT and PA effects in fluid samples. A focused 532 nm pulsed light optically heats the absorptive fluid in a capillary to locally create a transient temperature rise, as well as acoustic waves. A1550 nm CW laser light is quadrature-locked to detect the resonance spectrum shift of the LCORR and study thermal diffusion and acoustic wave propagation in the capillary. This modality provides an optofluidic investigative platform for biological/biochemical sensing and spectroscopy.

关键词： resonator quadrature capillary simultaneous modality extremely locked biochemical Observation optically

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Tunable single-longitudinal-mode SOA-based fiber laser based on the spectral narrowing effect in a dispersion-shifted fiber

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Chinese Optics Letters 2017年第10期15卷 25-27页

作者：沈振坤王琳曹元王旭东冯新焕关柏鸥 Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Institute of Photonics TechnologyJinan University

A tunable single-longitudinal-mode（SLM） semiconductor optical amplifier（SOA）-based fiber laser based on a dispersion-shifted fiber（DSF） is proposed and successfully demonstrated. SLM operation is obtained due to the spectral narrowing effect resulting from inverse four-wave mixing in a DSF. A tunable optical filter performs wavelength selection function. By inserting a length of DSF in the laser cavity, SLM lasing can possibly be obtained when laser oscillation is stably established after traveling through the DSF many roundtrips. Stable tunable SLM oscillation with a signal-to-noise ratio as high as 65 dB over a wavelength range of about 35 nm is achieved experimentally, and each spectral linewidth is less than 6.5 kHz.

关键词： SLM DSF SOA Tunable single-longitudinal-mode SOA-based fiber laser based on the spectral narrowing effect in a dispersion-shifted fiber

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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 demonstrated.This 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

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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

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Temperature-compensated dual-polarization fiber grating laser sensors

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Chinese Optics Letters 2016年第5期14卷 24-28页

作者：朱建明金龙梁贻智程凌浩关柏鸥 Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Institute of Photonics TechnologyJinan University

We report on temperature compensation for beat-frequency-encoded dual-polarization fiber laser sensors based on a cleave-rotate-splice method. By cleaving the laser cavity into two segments with comparable lengths, align- ing them with a rotated angle of 90°, and then fusion splicing the two halves, the temperature sensitivity in terms of beat-frequency variation can be greatly reduced from -1.99 to -0.30 MHz/℃ （or by 84.9%）. In contrast, the sensitivity to point loaded mass hardly changes. We also find that the beat-frequency fluctuation decreases from ±30 to ±25 kHz as a result of the temperature compensation.

关键词： fiber lasers Sensitivity analysis Temperature distribution

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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

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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

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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

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