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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 ***,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

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Ultra-compact on-chip slot Bragg grating structure for small electric field detection

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Photonics Research 2017年第3期5卷 212-218页

作者： wentao qiu HUIHUI LU FADI ISSAM BAIDA MARIA-PILAR BERNAL Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Department of Optoelectronic EngineeringJinan University Département d'Optique P.M.Duffieux Institut FEMTO-STUMR 6174 CNRS Université Bourgogne Franche-Comté

In this paper, we present an ultra-compact 1D photonic crystal(Ph C) Bragg grating design on a thin film lithium niobate slot waveguide(SWG) via 2D-and 3D-FDTD simulations. 2D-FDTD simulations are employed to tune the photonic bandgap(PBG) size, PBG center, cavity resonance wavelength, and the whole size of Ph C. 3DFDTD simulations are carried out to model the real structure by varying different geometrical parameters such as SWG height and Ph C size. A moderate resonance quality factor Q of about 300 is achieved with a Ph C size of only 0.5 μm× 0.7 μm× 6 μm. The proposed slot Bragg grating structure is then exploited as an electric field(E-field) sensor. The sensitivity is analyzed by 3D-FDTD simulations with a minimum detectable E-field as small as 23 m V∕m. The possible fabrication process of the proposed structure is also discussed. The compact size of the proposed slot Bragg grating structure may have applications in on-chip E-field sensing, optical filtering, etc.

关键词： of nm FDTD in PBG for

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Recent progress of second harmonic generation based on thin film lithium niobate [Invited]

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Chinese Optics Letters 2021年第6期19卷 54-65页

作者： Yang Li Zhijin Huang wentao qiu Jiangli Dong Heyuan Guan Huihui Lu Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Jinan UniversityGuangzhou 510632China Key Laboratory of Optoelectronic Information and Sensing Technologies of Guangdong Higher Education Institutes Jinan UniversityGuangzhou 510632China

Recently, nonlinear photonics has attracted considerable interest. Among the nonlinear effects, second harmonic generation(SHG) remains a hot research topic. The recent development of thin film lithium niobate(TFLN) technology has superior performances to the conventional counterparts. Herein, this review article reveals the recent progress of SHG based on TFLN and its integrated photonics. We mainly discuss and compare the different techniques of TFLN-based structures to boost the nonlinear performances assisted by localizing light in nanostructures and structured ***, our conclusions and perspectives indicate that more efficient methods need to be further explored for higher SHG conversion efficiency on the TFLN platform.

关键词： thin film lithium niobate second harmonic generation waveguide nanostructure

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工业纯铁电解制备高纯铁

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重庆大学学报（自然科学版） 2017年第12期40卷 59-70页

作者：黄红兵彭其春邱文涛武汉科技大学材料与冶金学院武汉430081 鄂州汉衍新材料公司湖北鄂州436000

以工业纯铁为原料,运用正交设计对电解制备高纯铁的影响因素进行研究,以电沉积速率、电流效率、电解铁纯度及外观为指标,确定各因素的显著性及最佳组合方案。用ICP-AES、扫描电镜(SEM)对电解铁纯度及其主要杂质元素进行分析,通过退火还... 详细信息

以工业纯铁为原料,运用正交设计对电解制备高纯铁的影响因素进行研究,以电沉积速率、电流效率、电解铁纯度及外观为指标,确定各因素的显著性及最佳组合方案。用ICP-AES、扫描电镜(SEM)对电解铁纯度及其主要杂质元素进行分析,通过退火还原对杂质氧进行分析提纯,并采用NaoH溶液浸出电解铁片,测量浸出液中SO_4^(2-)浓度。结果表明:溶液Fe^(2+)浓度50g/L,pH值为4,电解温度25℃,电流密度100A/m^2,是电解制纯铁实验的最佳因素组合。在该工艺参数下,电沉积速率为0.549g/h,电流效率达到89.2%,电解铁纯度达到99.98%以上;电解铁退火还原后氧元素含量大大减少,浸出液中硫酸根的量大约为30mg/L,且结合实际电解条件可知,氧和硫的主要存在形式为铁的氧化物和硫酸亚铁。

关键词：电解制备高纯铁正交设计最佳因素组合

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Distance-controllable and direction-steerable opto-conveyor for targeting delivery

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Photonics Research 2020年第7期8卷 1124-1133页

作者： Zhen Che Wenguo Zhu Yaoming Huang Yu Zhang Linqing Zhuo Pengpeng Fan Zhibin Li Huadan Zheng Wenjin Long wentao qiu Yunhan Luo Jun Zhang Jinghua Ge Jianhui Yu Zhe Chen Key Laboratory of Optoelectronic Information and Sensing Technologies of Guangdong Higher Education Institutes Guangdong Provincial Key Laboratory of Optical Fiber Sensing and CommunicationsJinan UniversityGuangzhou 510632China Department of Optoelectronic Engineering Jinan UniversityGuangzhou 510632China Department of Cell Biology Yale University School of MedicineNew HavenConnecticut 06510USA

Opto-conveyors have attracted widespread interest in various fields because of their non-invasive and non-contact delivery of micro/***,the flexible control of the delivery distance and the dynamic steering of the delivery direction,although very desirable in all-optical manipulation,have not yet been achieved by ***,using a simple and cost-effective scheme of an elliptically focused laser beam obliquely irradiated on a substrate,a direction-steerable and distance-controllable opto-conveyor for the targeting delivery of microparticles is ***,in the proposed scheme of the opto-conveyor,the transverse and longitudinal resultant forces of the optical gradient force and the optical scattering force result in the transverse confinement and the longitudinal transportation of microparticles,*** this study,it is experimentally shown that the proposed opto-conveyor is capable of realizing the targeting delivery for ***,the delivery distance of microparticles can be flexibly and precisely controlled by simply adjusting the irradiation *** simply rotating the cylindrical lens,the proposed opto-conveyor is capable of steering the delivery direction flexibly within a large range of azimuthal angles,from-75°to 75°.This study also successfully demonstrated the real-time dynamic steering of the delivery direction from-45°to 45°with the dynamical rotation of the cylindrical *** to its simplicity,flexibility,and controllability,the proposed method is capable of creating new opportunities in bioassays as well as in drug delivery.

关键词： simply cylindrical simplicity

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非线性超声实验系统的改进与优化

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科技与创新 2014年第19期 23-23,27页

作者：邱文涛南昌航空大学无损检测技术教育部重点实验室江西南昌330063

对实验室已建立的非线性超声实验系统的数据采集与处理进行了改进和优化。结果表明,新系统在保证实验结果准确、可靠的同时,提高了数据采集、分析的速度和整个系统的集成化程度,从而提升了实验系统的工作效率。

关键词：非线性超声技术检测系统正弦超声波二次谐波

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Resonance-assisted light–control–light characteristics of SnS_2 on a microfiber knot resonator with fast response

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Photonics Research 2018年第12期6卷 1137-1143页

作者： HUIHUI LU ZHONGMIN WANG ZHIJIN HUANG JUN TAO HANQING XIONG wentao qiu HEYUAN GUAN HUAZHUO DONG JIANGLI DONG WENGUO ZHU JIANHUI YU YONGCHUN ZHONG YUNHAN LUO JUN ZHANG ZHE CHEN Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Department of Optoelectronic EngineeringJinan University Key Laboratory of Optoelectronic Information and Sensing Technologies of Guangdong Higher Education Institutes Jinan University

An all-optical light–control–light functionality with the structure of a microfiber knot resonator (MKR) coated with tin disulfide (SnS_2) nanosheets is experimentally demonstrated. The evanescent light in the MKR [with a resonance Q of ～59,000 and an extinction ratio (ER) of ～26 dB] is exploited to enhance light–matter interaction by coating a two-dimensional material SnS_2 nanosheet onto it. Thanks to the enhanced light–matter interaction and the strong absorption property of SnS_2, the transmitted optical power can be tuned quasi-linearly with an external violet pump light power, where a transmitted optical power variation rate ΔT with respect to the violet light power of ～0.22 dB∕mW is obtained. In addition, the MKR structure possessing multiple resonances enables a direct experimental demonstration of the relationship between resonance properties (such as Q and ER), and the obtained ΔT variation rate with respect to the violet light power. It verifies experimentally that a higher resonance Q and a larger ER can lead to a higher ΔT variation rate. In terms of the operating speed, this device runs as fast as ～3.2 ms. This kind of all-optical light–control–light functional structure may find applications in future all-optical circuitry, handheld fiber sensors, etc.

关键词： response fast experimental optical multiple pump can tin

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Sensitivity-enhanced surface plasmon resonance sensor utilizing a tungsten disulfide (WS_2) nanosheets overlayer

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Photonics Research 2018年第6期6卷 485-491页

作者： HAO WANG HUI ZHANG JIANGLI DONG SHIQI HU WENGUO ZHU wentao qiu HUIHUI LU JIANHUI YU HEYUAN GUAN SHECHENG GAO ZHAOHUI LI WEIPING LIU MIAO HE JUN ZHANG ZHE CHEN YUNHAN LUO Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Jinan University School of Physics and Optoelectronic Engineering Guangdong University of Technology Key Laboratory of Optoelectronic Information and Sensing Technologies of Guangdong Higher Education Institutes Jinan University Key Laboratory of Visible Light Communications of Guangzhou Jinan University State Key Laboratory of Optoelectronic Materials and Technologies and School of Electronics and Information Technology Sun Yat-sen University

Tungsten disulfide （WS2）, as a representative layered transition metal dichalcogenide （TMDC） material, possesses important potential for applications in highly sensitive sensors. Here, a sensitivity-enhanced surface plasmon resonance （SPR） sensor with a metal film modified by an overlayer of WS2 nanosheets is proposed and demo onstrated. The SPR sensitivity is related to the thickness of the WS2 overlayer, which can be tailored by coating a WS2 ethanol suspension with different concentrations or by the number of times of repeated post-coating. Benefitting from its large surface area, high refractive index, and unique optoelectronic properties, the WS2 nanosheet overlayer coated on the gold film significantly improves the sensing sensitivity. The highest sensitivity （up to 2459.3 nm/RIU） in the experiment is achieved by coating the WS2 suspension once. Compared to the case without a WS2 overlayer, this result shows a sensitivity enhancement of 26.6%. The influence of the WS2 nano- sheet overlayer on the sensing performance improvement is analyzed and discussed. Moreover, the proposed WS2 SPR sensor has a linear correlation coefficient of 99.76% in refractive index range of 1.333 to 1.360. Besides sensitivity enhancement, the WS2 nanosheet overlayer is able to show additional advantages, such as protection of metal film from oxidation, tunability of the resonance wavelength region, biocompatibility, capability of vapor, and gas sensing.

关键词： Plasmonics Surface waves Optical sensing and sensors

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三维特性的斜激波在受限通道中发展的仿真模拟

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燃烧科学与技术 2018年第3期24卷 193-198页

作者：吴晋湘刘敏田亮闫文涛邱萍河北工业大学能源与环境工程学院天津300401

为了深入了解超燃冲压发动机中三维斜激波对燃烧室内流动产生的影响,应用数值模拟的方法,利用斜劈结构来模拟开式凹腔剪切层凸起,采用不同形状的斜劈结构,分析其在超声速流场中产生的三维斜激波以及激波与壁面的相互作用规律.斜劈展向... 详细信息

为了深入了解超燃冲压发动机中三维斜激波对燃烧室内流动产生的影响,应用数值模拟的方法,利用斜劈结构来模拟开式凹腔剪切层凸起,采用不同形状的斜劈结构,分析其在超声速流场中产生的三维斜激波以及激波与壁面的相互作用规律.斜劈展向与气流方向成45°角时,激波和膨胀波结构呈现三维特性,当激波与Z=20,mm壁面相交成锐角时会产生马赫反射;而激波与Z=0,mm壁面相交成钝角则会以叠加膨胀波的形式减弱激波,并且使激波面的法线方向与壁面的法线方向垂直.对于Λ型斜劈结构,产生的两个斜激波相交后会在相交处形成马赫反射,马赫反射激波面的宽度随高度增加而增加,最终达到侧壁面.

关键词：斜激波膨胀波斜劈激波反射

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Potassium and calcium channels in different nerve cells act as therapeutic targets in neurological disorders

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Neural Regeneration Research 2025年第5期20卷 1258-1276页

作者： Qing qiu Mengting Yang Danfeng Gong Haiying Liang Tingting Chen Department of Pharmacology School of PharmacyNantong UniversityNantongJiangsu ProvinceChina Jiangsu Province Key Laboratory of Inflammation and Molecular Drug Target NantongJiangsu ProvinceChina Department of Pharmacy Longyan First Affiliated Hospital of Fujian Medical UniversityLongyanFujian ProvinceChina

The central nervous system, information integration center of the body, is mainly composed of neurons and glial cells. The neuron is one of the most basic and important structural and functional units of the central nervous system, with sensory stimulation and excitation conduction functions. Astrocytes and microglia belong to the glial cell family, which is the main source of cytokines and represents the main defense system of the central nervous system. Nerve cells undergo neurotransmission or gliotransmission, which regulates neuronal activity via the ion channels, receptors, or transporters expressed on nerve cell membranes. Ion channels, composed of large transmembrane proteins, play crucial roles in maintaining nerve cell homeostasis. These channels are also important for control of the membrane potential and in the secretion of neurotransmitters. A variety of cellular functions and life activities, including functional regulation of the central nervous system, the generation and conduction of nerve excitation, the occurrence of receptor potential, heart pulsation, smooth muscle peristalsis, skeletal muscle contraction, and hormone secretion, are closely related to ion channels associated with passive transmembrane transport. Two types of ion channels in the central nervous system, potassium channels and calcium channels, are closely related to various neurological disorders, including Alzheimer's disease, Parkinson's disease, and epilepsy. Accordingly, various drugs that can affect these ion channels have been explored deeply to provide new directions for the treatment of these neurological disorders. In this review, we focus on the functions of potassium and calcium ion channels in different nerve cells and their involvement in neurological disorders such as Parkinson's disease, Alzheimer's disease, depression, epilepsy, autism, and rare disorders. We also describe several clinical drugs that target potassium or calcium channels in nerve cells and could be u

关键词： astrocytes calcium channels central nervous system extracellular ion concentration microglia neurological disorders neurons potassium channels

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