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Dielectric metasurface evolution from bulk to monolayer by strong coupling of quasi-BICs for second harmonic boosting

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Photonics Research 2024年第4期12卷 784-792页

作者： yinong xie QIANTING CHEN JIN YAO XUEYING LIU ZHAOGANG DONG JINFENG ZHU Institute of Electromagnetics and Acoustics and Key Laboratory of Electromagnetic Wave Science and Detection Technology Xiamen UniversityXiamen 361005China Shenzhen Research Institute of Xiamen University Shenzhen 518057China Department of Electrical Engineering City University of Hong KongHong Kong 999077China Institute of Materials Research and Engineering(IMRE) Agency for ScienceTechnology and Research(A*STAR)Singapore 138634Singapore Department of Materials Science and Engineering National University of SingaporeSingapore 117575Singapore

2D materials are promising candidates as nonlinear optical components for on-chip devices due to their ultrathin structure. In general, their nonlinear optical responses are inherently weak due to the short interaction thickness with light. Recently, there has been great interest in using quasi-bound states in the continuum (q-BICs) of dielectric metasurfaces, which are able to achieve remarkable optical near-field enhancement for elevating the second harmonic generation (SHG) emission from 2D materials. However, most studies focus on the design of combining bulk dielectric metasurfaces with unpatterned 2D materials, which suffer considerable radiation loss and limit near-field enhancement by high-quality q-BIC resonances. Here, we investigate the dielectric metasurface evolution from bulk silicon to monolayer molybdenum disulfide (MoS2), and discover the critical role of meta-atom thickness design on enhancing near-field effects of two q-BIC modes. We further introduce the strongcoupling of the two q-BIC modes by oblique incidence manipulation, and enhance the localized optical field on monolayer MoS2dramatically. In the ultraviolet and visible regions, the MoS2SHG enhancement factor of our design is 105times higher than that of conventional bulk metasurfaces, leading to an extremely high nonlinear conversion efficiency of 5.8%. Our research will provide an important theoretical guide for the design of high-performance nonlinear devices based on 2D materials.

关键词： monolayer harmonic quasi

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Optical colorimetric LiTaO_(3)wafers for highprecision lithography on frequency control of SAW devices

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Photonics Research 2024年第2期12卷 341-349页

作者： MING HUI FANG yinong xie FANGQI XUE ZHILIN WU JUN SHI SHENG YU YANG YILIN LIU ZHIHUANG LIU HSIN CHI WANG FAJUN LI QING HUO LIU JINFENG ZHU School of Electronic Science and Engineering Xiamen UniversityXiamen 361005China Quanzhou San’an Integrated Circuit Co. Ltd.Quanzhou 362300China Eastern Institute of Technology Ningbo 315200China

Surface acoustic wave(SAW)resonators based on lithium tantalate(LT,LiTaO_(3))wafers are crucial elements of mobile communication *** use of intrinsic LT wafers typically brings about low fabrication accuracy of SAW resonators due to strong UV reflection in the lithography *** hinders their resonance frequency control seriously in industrial *** doping and chemical reduction could be applied to decrease the UV reflection of LT wafers for high lithographic ***,conventional methods fail to provide a fast and nondestructive approach to identify the UV performance of standard single-side polished LT wafers for highprecision frequency ***,we propose a convenient on-line sensing scheme based on the colorimetry of reduced Fe-doped LT wafers and build up an automatic testing system for industrial *** levels of Fe doping and chemical reduction are evaluated by the lightness and color difference of LT-based *** correlation between the wafer visible colorimetry and UV reflection is established to refine the lithography process and specifically manipulate the frequency performance of SAW *** study provides a powerful tool for the fabrication control of SAW resonators and will inspire more applications on sophisticated devices of mobile communication.

关键词： lithography doping wafer

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RNA-Guided Genome Editing in Plants Using a CRISPR-Cas System

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Molecular Plant 2013年第6期6卷 1975-1983页

作者： Kabin xie yinong Yang Department of Plant Pathology and Environmental Microbiology The Huck Institute of the Life Sciences Pennsylvania State University University Park PA16802 USA

Precise and straightforward methods to edit the plant genome are much needed for functional genomics and crop improvement. Recently, RNA-guided genome editing using bacterial Type II cluster regularly interspaced short palindromic repeats （CRISPR）-associated nuclease （Cas） is emerging as an efficient tool for genome editing in microbial and animal systems. Here, we report the genome editing and targeted gene mutation in plants via the CRISPR-Cas9 sys- tem. Three guide RNAs （gRNAs） with a 20-22-nt seed region were designed to pair with distinct rice genomic sites which are followed by the protospacer-adjacent motif （PAM）. The engineered gRNAs were shown to direct the Cas9 nuclease for precise cleavage at the desired sites and introduce mutation （insertion or deletion） by error-prone non-homologous end joining DNA repairing. By analyzing the RNA-guided genome-editing events, the mutation efficiency at these target sites was estimated to be 3-8%. In addition, the off-target effect of an engineered gRNA-Cas9 was found on an imper- fectly paired genomic site, but it had lower genome-editing efficiency than the perfectly matched site. Further analysis suggests that mismatch position between gRNA seed and target DNA is an important determinant of the gRNA-Cas9 tar- geting specificity, and specific gRNAs could be designed to target more than 90% of rice genes. Our results demonstrate that the CRISPR-Cas system can be exploited as a powerful tool for gene targeting and precise genome editing in plants.

关键词： CRISPR-Cas gene targeting genome editing.

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Enhancing THz fingerprint detection on the planar surface of an inverted dielectric metagrating

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Photonics Research 2022年第12期10卷 2836-2845页

作者： XUEYING LIU WEI CHEN YONGJIE MA yinong xie JUN ZHOU LIGUO ZHU YADONG XU JINFENG ZHU Institute of Electromagnetics and Acoustics and Key Laboratory of Electromagnetic Wave Science and Detection Technology Xiamen UniversityXiamen 361005China State Key Laboratory of Applied Optics Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun130033China Terahertz Research Center University of Electronic Science and Technology of ChinaChengdu 610054China Microsystem and Terahertz Research Center China Academy of Engineering PhysicsMianyang 621900China School of Physical Science and Technology and Institute of Theoretical and Applied Physics Soochow UniversitySuzhou 215006China

Terahertz(THz)molecular fingerprint sensing provides a powerful label-free tool for the detection of traceamount *** to the weak light–matter interaction,various metallic or dielectric metasurfaces have been adopted to enhance fingerprint absorbance ***,they suffer from strong background damping or complicated sample coating on patterned ***,we propose an inverted dielectric metagrating and enhance the broadband THz fingerprint detection of trace analytes on a planar sensing *** of the broadband signal originates from the effects of evanescent waves at the planar interface,which are excited by multiplexed quasi-bound states in the continuum(quasi-BICs).One can evenly boost the near-field intensities within the analytes by tuning the asymmetry parameter of quasi-BIC *** multiplexing mechanism of broadband detection is demonstrated by manipulating the incident angle of excitation waves and thickness of the waveguide *** to the conventional approach,the THz fingerprint peak value is dramatically elevated,and the largest peak enhancement time is *** work gives a promising way to facilitate the metasensing of the THz fingerprint on a planar surface and will inspire universal THz spectral analysis for trace analytes with different physical states or morphologies.

关键词： waveguide tuning planar

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启动振动与海浪冲击耦合时变UHMWPE轴承润滑分析

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振动与冲击 2019年第24期38卷 144-149页

作者：谢奕浓王优强宋晓萍赵晶晶张平青岛理工大学机械与汽车工程学院

建立了启动过程超高分子量聚乙烯(UHMWPE)轴承的弹流润滑模型。综合考虑加速过程伴随振动与冲击载荷耦合时变效应,数值模拟了UHMWPE轴承不同工况下启动时的润滑情况,以期为实际工况中UHMWPE轴承的安全运转提供参考。结果表明:冲击对压... 详细信息

建立了启动过程超高分子量聚乙烯(UHMWPE)轴承的弹流润滑模型。综合考虑加速过程伴随振动与冲击载荷耦合时变效应,数值模拟了UHMWPE轴承不同工况下启动时的润滑情况,以期为实际工况中UHMWPE轴承的安全运转提供参考。结果表明:冲击对压力的影响较大,而振动对膜厚的影响较大。轴法向振动与海浪冲击同周期下,当两者变化一致时,将产生叠加的协同作用,反之则相互削弱。其中负正弦振动对压力和膜厚的影响更为明显。随着加速度的增大,压力随之降低,膜厚随之增大,膜厚增幅变大,振动对压力和膜厚的影响变小。

关键词：超高分子量聚乙烯(UHMWPE)轴承启动过程轴振动海浪冲击耦合时变效应弹流润滑

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居家老龄人对养老地产、金融理财需求情况的调查分析

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时代经贸 2020年第20期18卷 96-97页

作者：谢意浓谢荣华广东碧桂园职业学院广东清远511510 湖南环境生物职业技术学院湖南衡阳421001

目的:探讨老龄人对养老地产、金融理财服务需求。方法:利用自编的调查问卷对湖南省衡阳市821位不同性别、年龄、收入水平、居住地、自理能力老人对养老地产、金融理财服务需求进行调查。结果:养老地产需求为113人,占13.76%(113/821);金... 详细信息

目的:探讨老龄人对养老地产、金融理财服务需求。方法:利用自编的调查问卷对湖南省衡阳市821位不同性别、年龄、收入水平、居住地、自理能力老人对养老地产、金融理财服务需求进行调查。结果:养老地产需求为113人,占13.76%(113/821);金融理财需求为38人,占4.63%(38/821)。不同性别、年龄、收入水平、居住地、自理能力老人对养老地产、金融理财服务需求有区别。结论:政府、行业部门及社会应支持和规范养老地产、金融理财行业,为不同情况老龄人提供个性化的养老服务。

关键词：老龄人养老地产金融理财

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7055铝合金在3.5%NaCl溶液中腐蚀磨损性能的研究

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摩擦学学报 2020年第1期40卷 73-81页

作者：宋晓萍王优强张平曹磊谢奕浓赵晶晶青岛理工大学机械与汽车工程学院山东青岛266033

本文中研究了不同固溶处理后7055铝合金在3.5%NaCl溶液中的耐腐蚀行为,在3.5%NaCl溶液下进行了静态腐蚀试验及腐蚀磨损试验,并通过扫描电子显微镜对磨痕形貌进行分析.结果表明:固溶处理后试样的耐腐蚀性能均有不同程度的提高,其中以双... 详细信息

本文中研究了不同固溶处理后7055铝合金在3.5%NaCl溶液中的耐腐蚀行为,在3.5%NaCl溶液下进行了静态腐蚀试验及腐蚀磨损试验,并通过扫描电子显微镜对磨痕形貌进行分析.结果表明:固溶处理后试样的耐腐蚀性能均有不同程度的提高,其中以双级固溶处理试样的耐腐蚀性能最好.在动极化、开路电位以及阴极保护和阳极加速腐蚀试验中,固溶处理后材料自腐蚀电位正移,腐蚀电流密度减小,耐腐蚀磨损性能提高.在不同加载电位下,腐蚀电流密度和磨损率随着电位的增加而增大,在-1.2 V时摩擦系数最小.同时随着电位的升高,腐蚀作用促进了合金的磨损.在较低电位时,合金的腐蚀磨损机制主要是磨粒磨损;而较高电位下,合金的腐蚀磨损机制主要是黏着磨损和腐蚀磨损.

关键词： 7055铝合金 3.5%NaCl 固溶处理电化学腐蚀腐蚀磨损磨损机制

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7-羟基黄酮衍生物的合成

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华西药学杂志 1999年第Z1期14卷 309-310+314页

作者：王晓莉徐鸣夏谢益农华西医科大学药学院!成都610041 四川大学!成都610061

以具心血管活性的７－羟基黄酮为底物，分别与阿魏酸、烟酸、对氯苯氧异丁酸成酯，合成了三个新化合物，其结构经１ＨＮＭＲ、ＭＳ和ＩＲ确证。

关键词：心血管活性 7-羟基黄酮阿魏酸烟酸氯贝丁酯

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Erratum Enhancing THz fingerprint detection on the planar surface of an inverted dielectric metagrating:publisher's note

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Photonics Research 2023年第4期11卷 581-581页

作者： XUEYING LIU WEI CHEN YONGJIE MA yinong xie JUN ZHOU LIGUO ZHU YADONG XU JINFENG ZHU Institute of Electromagnetics and Acoustics and Key Laboratory of Electromagnetic Wave Science and Detection Technology Xiamen UniversityXiamen 361005China State Key Laboratory of Applied Optics Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China Terahertz Research Center University of Electronic Science and Technology of ChinaChengdu 610054China Microsystem and Terahertz Research Center China Academy of Engineering PhysicsMianyang 621900China School of Physical Science and Technology and Institute of Theoretical and Applied Physics Soochow UniversitySuzhou 215006China

The Funding section in Ref.[1]originally reads as follows:*** Science Foundation of Fujian Province(2020J06009);Open Fund of State Key Laboratory of Applied Optics (SKLAO2020001A15);National Safety Academic Fund (U213... 详细信息

关键词： Fujian originally fingerprint

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刚玉砂轮外圆磨削微观热流体动压效应分析

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润滑与密封 2019年第7期44卷 57-62页

作者：宋晓萍王优强谢奕浓赵晶晶青岛理工大学机械与汽车工程学院

为了研究陶瓷刚玉砂轮外圆磨削轴承钢(GCr15)时的流体动压效应,基于弹性流体动力润滑理论,建立稳态微观热弹流砂轮模型;对比分析等温条件下陶瓷刚玉磨料、金刚石磨料、CBN磨料的流体动压效应,分析热效应以及粗糙度幅值和波长对乳化液润... 详细信息

为了研究陶瓷刚玉砂轮外圆磨削轴承钢(GCr15)时的流体动压效应,基于弹性流体动力润滑理论,建立稳态微观热弹流砂轮模型;对比分析等温条件下陶瓷刚玉磨料、金刚石磨料、CBN磨料的流体动压效应,分析热效应以及粗糙度幅值和波长对乳化液润滑时流体动压效应的影响。结果表明:陶瓷刚玉磨料砂轮相比于其他磨料砂轮的整体压力最小,整体膜厚最大;磨削过程中热效应的影响不可忽略,考虑热效应的影响时,磨削区压力和膜厚减小;随着粗糙度幅值的增大,压力增大,膜厚减小;粗糙度的波长主要和粗糙峰的疏密程度有关,对流体动压力和膜厚的影响较小。

关键词：陶瓷刚玉砂轮流体动压效应热效应表面形貌

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