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On-chip generation of Bessel–Gaussian beam via concentrically distributed grating arrays for long-range sensing

Light(Science & Applications) 2023年第5期12卷 817-825页

作者： Zihao Zhi Quanxin Na qijie xie Baisong Chen Yingzhi Li Xiaobin Liu Xuetong Li Lijun Wang Guoqiang Lo Junfeng Song State Key Laboratory on Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012China Peng Cheng Laboratory Shenzhen 518000China State Key Laboratory of Luminescence and Application Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China Advance Micro Foundry Pte.Ltd. 11 Science Park RoadScience Park II 117685Singapore

Bessel beam featured with self-healing is essential to the optical sensing applications in the obstacle scattering *** on-chip generation of the Bessel beam outperforms the conventional structure by small size,robustness,and alignment-free ***,the maximum propagation distance(Z_(max))provided by the existing approaches cannot support long-range sensing,and thus,it restricts its potential *** this work,we propose an integrated silicon photonic chip with unique structures featured with concentrically distributed grating arrays to generate the Bessel-Gaussian beam with a long propagation *** spot with the Bessel function profile is measured at 10.24m without optical lenses,and the photonic chip’s operation wavelength can be continuously performed from 1500 to 1630 *** demonstrate the functionality of the generated Bessel-Gaussian beam,we also experimentally measure the rotation speeds of a spinning object via the rotational Doppler Effect and the distance through the phase laser ranging *** maximum error of the rotation speed in this experiment is measured to be 0.05%,indicating the minimum error in the current *** the compact size,low cost,and mass production potential of the integrated process,our approach is promising to readily enable the Bessel-Gaussian beam in widespread optical communication and micro-manipulation applications.

关键词： scattering Bessel beam

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Spatial and Temporal Characteristics of Drought and Flood in Quanzhou Based on Standardized Precipitation Index (SPI) in Recent 55 Years

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Journal of Geoscience and Environment Protection 2018年第8期6卷 25-37页

作者： Dehe Liu Jingfei You qijie xie Yuanyuan Huang Huajun Tong Yongchun County Meteorological Bureau of Fujian Province Yongchun China Quanzhou Meteorological Bureau of Fujian Province Quanzhou China Nan’an Meteorological Bureau of Fujian Province Nan’an China

To analyze the characteristics of drought and flood variations in Quanzhou during recent 55 years, the standardized precipitation index (SPI) and Empirical Orthogonal Function (EOF) and Rotated Empirical Orthogonal Function (REOF) were calculated by using the monthly precipitation data from 6 meteorological bureaus across Quanzhou for 1960-2014. Results showed that: 1) During 1960-2014, the drought and flood showed Periodic variation characteristics in Quanzhou, the specific period of frequent drought was 1963-1972, 1977-1986 and 2009-2011, and the specific period of frequent flood was 1961-1962, 1972-1975, 1990-1992 and 1997-2007;the drought and flood did not have significant tendency of variation in Spring and Summer, and the drought and flood showed a non-significant downward trend in Autumn and Winter. 2) The drought and flood variation had relatively consistent trend in Quanzhou, but there was a big difference on the northwest mountainous area, the middle semi-mountainous area and the southeast coast area in some periods. 3) The precipitation cell and distribution in every season were Nan’an and Anxi, but there was a big difference in rainfall less area: it was Yongchun and Dehua in Spring, Chongwu and Jinjiang in Summer, Chongwu in Autumn, Dehua and Chongwu in Winter.

关键词： Standardized Precipitation Index Drought and Flood Empirical Orthogonal Function (EOF) Rotated Empirical Orthogonal Function (REOF)

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Synthesis of 2-Substituted-1,1,1-Trichloro-3-Nitropropane——A New Type of Fungicide

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Chemical Journal of Chinese Universities 1987年第2期 26-31页

作者： Chen qijie,Liu Fengping xie Longguan(Institute of Element-Organic Chemistry,Nankai University,Tianjin)

The syntheses of fourty-six 2-hydroxy-,2-amino-,2-hydrazino-,and 2-azacyclyl-1,1,1 -trichloro-3-nitropropane derivatives were *** bioassays showed that the compounds exhibited fairly good fungistatic activity,among th... 详细信息

关键词： Cl CI HR A New Type of Fungicide Synthesis of 2-Substituted-1,1,1-Trichloro-3-Nitropropane

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Silicon-based optical phased array with a reconfigurable aperture for“gaze”scanning of LiDAR

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Photonics Research 2024年第5期12卷 932-940页

作者： HEMING HU YAFANG HE BAISONG CHEN ZIMING WANG YINGZHI LI qijie xie QUANXIN NA ZIHAO ZHI XUETONG LI HUAN QU PATRICK LO JUNFENG SONG State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012China Peng Cheng Laboratory Shenzhen 518000China Advance Micro Foundry Pte.Ltd. Singapore 117685Singapore

Light detection and ranging(LiDAR)serves as one of the key components in the fields of autonomous driving,surveying mapping,and environment ***,dense points clouds are pursued by LiDAR systems to provide high-definition 3D ***,the LiDAR is typically used to produce abundant yet redundant data for scanning the homogeneous background of scenes,resulting in power waste and excessive processing ***,it is highly desirable for a LiDAR system to“gaze”at the target of interest by dense scanning and rough sparse scans on the uninteresting ***,we propose a LiDAR structure based on an optical phased array(OPA)with reconfigurable apertures to achieve such a gaze scanning *** virtue of the cascaded optical switch integrated on the OPA chip,a 64-,128-,192-,or 256-channel antenna can be selected discretionarily to construct an aperture with variable *** corresponding divergence angles for the far-field beam are 0.32°,0.15°,0.10°,and 0.08°,*** reconfigurable-aperture OPA enables the LiDAR system to perform rough scans via the large beam spots prior to fine scans of the target by using the tiny beam *** this way,the OPA-based LiDAR can perform the“gaze”function and achieve full-range scanning *** scanning time and power consumption can be reduced by 1/4 while precise details of the target are ***,we embed the OPA into a frequency-modulated continuous-wave(FMCW)system to demonstrate the“gaze”function in beam *** results show that the number of precise scanning points can be reduced by 2/3 yet can obtain the reasonable outline of the *** reconfigurable-aperture OPA(RA-OPA)can be a promising candidate for the applications of rapid recognition,like car navigation and robot vision.

关键词： reconfigurable optical antenna

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Wide-steering-angle high-resolution optical phased array

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Photonics Research 2021年第12期9卷 2511-2518页

作者： YINGZHI LI BAISONG CHEN QUANXIN NA qijie xie MIN TAO LANXUAN ZHANG ZIHAO ZHI YUXUAN LI XIAOBIN LIU XIANSHU LUO GUOQIANG LO FENGLI GAO XUEYAN LI JUNFENG SONG State Key Laboratory on Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012China Peng Cheng Laboratory Shenzhen 518000China Advance Micro Foundry Pte.Ltd. Singapore 117685Singapore

Optical phased array(OPA)technology is considered a promising solution for solid-state beam steering to supersede the traditional mechanical beam *** a key component of the LIDAR system for long-range detection,OPAs featuring a wide steering angle and high resolution without beam aliasing are highly ***,a wide steering range requires a waveguide pitch less than half of the wavelength,which is easily subjected to cross ***,high resolution requires a large aperture,and it is normally achieved by a high count number of waveguides,which complicates the control *** solve the mentioned issues,we design two high-performance 128-channel OPAs fabricated on a multilayered SiN-on-SOI *** to the nonuniform antenna pitch,only 128 waveguides are used to achieve a 4 mm wide ***,by virtue of innovative dual-level silicon nitride(Si_(3)N_(4))waveguide grating antennas,the fishbone antenna OPA achieves a 100°×19.4°field of view(FOV)with divergence of 0.021°×0.029°,and the chain antenna OPA realizes a 140°×19.23°FOV with divergence of 0.021°×0.1°.To our best knowledge,140°is the widest lateral steering range in two-dimensional OPA,and 0.029°is the smallest longitudinal ***,we embed the OPA into a frequency-modulated continuous-wave system to achieve 100 m distance *** reflected signal from 100 m distance is well detected with 26 dBm input transmitter power,which proves that OPA serves as a promising candidate for transceiving optical signal in a LIDAR system.

关键词： antenna waveguide resolution

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THE MECHANISM OF THE FORMATION OF CONDENSATION PRODUCT OF N-SUBSTITUTED SALICYLANILIDE WITH THIOPHOSPHORYL DICHLORIDE

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Chinese Science Bulletin 1986年第17期31卷 1184-1187页

作者：陈其杰谢龙观 Institute of Element-Organic Chemistry Nankai University Tianjin Institute of Element-Organic Chemistry Nankai University Tianjint has been reported in a previous work that both compounds Ⅰ and Ⅱ could be obtained simultaneously by the reaction of N-substituted salicylanilide with thiophosphoryl dichloride in the presence of triethylamine or potassium carbonate:

It has been reported in a previous work that both compounds Ⅰ and Ⅱ could be obtained simultaneously by the reaction of N-substituted salicylanilide with thiophosphoryl dichloride in the presence of triethylamine or... 详细信息

关键词： carbonate potassium substituted petroleum benzene effluent dimethylamino adsorbent removed afford

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硅基量子点激光器研究进展

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发光学报 2023年第11期44卷 2011-2026页

作者：张楠谢启杰纳全鑫骆登峰贾思琪王恺鹏城实验室广东深圳518055 南方科技大学电子与电气工程系广东深圳518055

随着全球数据流量的不断增长,硅基光子集成电路已经成为高性能芯片内/芯片间光通信领域中一个极具发展潜力的研究方向。然而,由于本征硅的发光效率极低,硅基片上光源成为光子集成电路中最具挑战性的元器件。为了解决缺乏原生光源的问题... 详细信息

随着全球数据流量的不断增长,硅基光子集成电路已经成为高性能芯片内/芯片间光通信领域中一个极具发展潜力的研究方向。然而,由于本征硅的发光效率极低,硅基片上光源成为光子集成电路中最具挑战性的元器件。为了解决缺乏原生光源的问题,硅基集成的Ⅲ-Ⅴ族半导体激光器已经得到了广泛研究,该激光器提供了优越的光学和电学性能。值得注意的是,在Ⅲ-Ⅴ族半导体激光器中使用量子点作为增益介质已经引起了诸多关注,因为它具有多种优点,如对晶体缺陷的容忍度高、温度敏感度低、阈值电流密度低和反射灵敏度低等。使用量子点的激光增益区在光子集成方面相比量子阱有许多改进。增益带宽可以根据需要进行设计优化,并在整个近红外光范围内实现激射。量子态与周围材料的大能级分离使其获得了优异的高温性能和亚皮秒时间尺度的增益恢复。本文从量子点材料及量子点激光器、基于晶圆键合技术、基于倒装键合技术、基于直接外延生长技术等多个角度,综述了硅基Ⅲ-Ⅴ族半导体量子点激光器的最新研究进展,并对其未来前景和挑战进行了探讨。

关键词：硅光子学片上量子点激光器光子集成

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风正好扬帆——中国海事局建局十周年成就之党风廉政建设篇

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中国海事 2008年第12期 31-33页

作者：解启杰童翠龙

十年前,当中国海事局（交通部海事局）组建的时候,其作为行使国家水上安全监督管理、防止船舶污染、船舶及海上设施检验、航海保障和交通行业安全等管理职责的国家行政执法机关,是交通部直属机构,也是交通部最大的行政执法机关。部党组... 详细信息

十年前,当中国海事局（交通部海事局）组建的时候,其作为行使国家水上安全监督管理、防止船舶污染、船舶及海上设施检验、航海保障和交通行业安全等管理职责的国家行政执法机关,是交通部直属机构,也是交通部最大的行政执法机关。部党组对新成立的部海事局党委提出了高标准要求：确保水上安全形势持续稳定,

关键词：中国海事局党风廉政建设水上安全监督管理船舶污染执法机关交通部海上设施管理职责

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碳化养护对掺电石渣水泥石性能的影响

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复合材料学报 2024年第2期41卷 1001-1010页

作者：秦玲毛星泰谢期劼崔祎菲鲍玖文陈铁锋高小建张鹏青岛理工大学土木工程学院青岛266525 西安建筑科技大学土木工程博士后科研流动站西安710055 青岛青建新型材料集团有限公司青岛266108 哈尔滨工业大学土木工程学院哈尔滨150090

为降低水泥行业的碳足迹同时回收利用电石渣,本文将电石渣作为掺合料加入碳化养护水泥中,研究了碳化养护对掺电石渣水泥石抗压强度、干燥收缩、氯离子渗透等性能的影响,并利用X射线衍射、热分析、压汞法、扫描电镜等测试手段对水泥石的... 详细信息

为降低水泥行业的碳足迹同时回收利用电石渣,本文将电石渣作为掺合料加入碳化养护水泥中,研究了碳化养护对掺电石渣水泥石抗压强度、干燥收缩、氯离子渗透等性能的影响,并利用X射线衍射、热分析、压汞法、扫描电镜等测试手段对水泥石的微观结构进行了分析。结果表明:碳化养护提高了掺电石渣水泥石的抗压强度及抗氯离子侵蚀性能,使其电通量降低了38.17%~50.08%,56天干燥收缩率降低了8.8%~25.2%,细化了其孔结构。在保证水泥石强度不降低的前提下,约10%的电石渣可以被资源化利用,同时水泥石的固碳率可达11.19%~15.87%。利用碳化养护达到了捕捉固化二氧化碳、资源化利用电石渣、提升水泥石性能的目的。

关键词：电石渣水泥基材料碳化养护抗压强度微观结构

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在Web中自动绘制台风实时路径图

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气象科技 2007年第4期35卷 607-609页

作者：张加春陈煜谢启杰施曼华福建省泉州市气象局泉州362000

采用C++语言自动搜索气象卫星综合应用业务系统的台风报文且转换成实时台风位置等信息的数据库,并将台风实时位置等相关信息通过矢量图形可标记语言(VML)自动绘制于Web网中,生成互联网上的台风实时路径图像和台风相关信息,体现台风的及... 详细信息

采用C++语言自动搜索气象卫星综合应用业务系统的台风报文且转换成实时台风位置等信息的数据库,并将台风实时位置等相关信息通过矢量图形可标记语言(VML)自动绘制于Web网中,生成互联网上的台风实时路径图像和台风相关信息,体现台风的及时性、自动化和图形化显示特点,让公众能更直观地在互联网上浏览到台风实时路径等信息。该技术现已在泉州气象网上成功体现。

关键词： VML技术台风路径 Web实际显示

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