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Completely spin-decoupled geometric phase of a metasurface

Photonics Research 2023年第7期11卷 1162-1174页

作者： XINMIN FU JIE YANG JIAFU WANG YAJUAN han ChanG DING TIANSHUO QIU BINGYUE QU LEI LI YONGFENG LI shaobo QU Shaanxi Key Laboratory of Artificially-Structured Functional Materials and Devices Air Force Engineering UniversityXi’an 710051China School of Electronic and Information Engineering Xi’an Jiaotong UniversityXi’an 710049China

Metasurfaces have provided an unprecedented degree of freedom(DOF)in the manipulation of electromagnetic waves.A geometric phase can be readily obtained by rotating the meta-atoms of a ***,such geometric phases are usually spin-coupled,with the same magnitude but opposite signs for left-and right-handed circularly polarized(LCP and RCP)*** achieve independent control of LCP and RCP waves,it is crucial to obtain spin-decoupled geometric *** this paper,we propose to obtain completely spin-decoupled geometric phases by engineering the surface current paths on *** on the rotational Doppler effect,the rotation manner is first analyzed,and it is found that the generation of a geometric phase lies in the rotation of the surface current paths on *** the induced surface current paths under the LCP and RCP waves always start oppositely and are mirror-symmetrical with each other,it is natural that the geometric phases have the same magnitude and opposite signs when the meta-atoms are *** obtain spin-decoupled geometric phases,the induced surface current under one spin should be rotated by one angle while the current under the other spin is rotated by a different *** this way,LCP and RCP waves can acquire different geometric phase ***-of-principle prototypes were designed,fabricated,and *** the simulation and experiment results verify spin-decoupled geometric *** work provides a robust means to obtain a spindependent geometric phase and can be readily extended to higher frequency bands such as the terahertz,IR,and optical regimes.

关键词： geometric opposite surface

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Sub-10-fs pulse generation from a blue laser-diode-pumped Ti:sapphire oscillator

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Chinese Optics Letters 2020年第7期18卷 60-63页

作者： han Liu Geyang Wang Jianwang Jiang Wenlong Tian Dacheng Zhang Hainian han shaobo Fang Jiangfeng Zhu Zhiyi Wei School of Physics and Optoelectronic Engineering Xidian UniversityXi’an 710071China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China

Pulses as short as 8.1 fs were generated from a blue laser-diode-pumped Kerr-lens mode-locked Ti:sapphire oscillator, with an average power of 27 m W and a repetition rate of 120.6 MHz. The full width at half-maximum exceeds 146 nm, benefitting from the dispersion management by a combination of a low-dispersion fused silica prism pair and a series of double-chirped mirrors. To the best of our knowledge, this is the first time to generate sub-10-fs pulses from a laser diode directly pumped Ti:sapphire oscillator.

关键词： diode-pumped lasers titanium mode-locked lasers

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Development of a High-sensitivity and Low-background Neutron Detector

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IMP & HIRFL Annual Report 2019年第1期 203-204页

作者： Gao Bingshui Chen han Lin Weiping Ma shaobo Tang Xiaodong Tian Ning Zhang Ningtao Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China Key Laboratory of Radiation Physics and Technology of the Ministry of Education Institute of Nuclear Science and TechnologySichuan UniversityChengdu 610064China

A high-sensitivity and low-background neutron detector has been developed to measure the cross section of the 13C(a,n)16O reaction at Gamow window at the Jinping Underground laboratory for Nuclear Astrophysics(JUNA)[1... 详细信息

关键词： Jin section

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2-17 Method for Determination of Deuterium Impurity in Helium Beam

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IMP & HIRFL Annual Report 2016年第1期 50-51页

作者： Chen han Xu Shiwei Zhang Ningtao Ma shaobo Ruan Xichao Tang Xiaodong Zhang Liyong 不详

JUNA(Jinping Underground laboratory for Nuclear Astrophysics)is planing to measure the 13C(α,n)16O and some other important reactions at or close to stellar energies using intense helium beam out of an ECR driven accelerator in Jinping Underground laboratory[1].Deuterium impurity in ion source will produces significant amount of neutrons,limiting the background *** control the deterium impurity,we have developed a method to measure the deuterium impurity within Helium beam using the d(d,p)t reaction.

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中国信息系统（IS）研究的多样性研究

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情报学报 2005年第2期24卷 142-150页

作者：季绍波韩维贺闵庆飞 Sprott Business School Carleton University OttawaOntarioKIS 5B6Canada 大连理工大学管理学院大连116024

本文对1999年至2003年中国管理类18种重要期刊中的604篇信息系统(IS)领域文章进行了实证研究,目的在于分析国内IS研究的多样性.本文从研究题目、参考学科、研究方法、分析层次4个角度,对中国IS研究的多样性进行了描述和时间序列分析.通... 详细信息

本文对1999年至2003年中国管理类18种重要期刊中的604篇信息系统(IS)领域文章进行了实证研究,目的在于分析国内IS研究的多样性.本文从研究题目、参考学科、研究方法、分析层次4个角度,对中国IS研究的多样性进行了描述和时间序列分析.通过与国外IS研究多样性的比较,本文阐释了中国IS研究多样性的特征.最后分析了IS研究多样性对于中国IS学科发展可能产生的正、负面影响,并提出了相应措施.

关键词：中国信息系统 IS 研究方法参考学科

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共建实验室的项目化管理探讨

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实验技术与管理 2010年第9期27卷 178-180,183页

作者：林少波韩西魏伟重庆交通大学实验教学及设备管理处

根据中央与地方共建高校实验室建设项目的具体要求和重庆市地方高校的实际情况,结合共建项目的实施,从确保共建项目的投资效益的角度,分析和提出共建实验室项目立项、论证、组织实施、评估验收等一整套科学的管理体系和方法。

关键词：共建实验室项目化管理效益

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Virtual metasurfaces:reshaping electromagnetic waves in distance

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Photonics Research 2023年第2期11卷 203-211页

作者： RUICHAO ZHU JIAFU WANG YAJUAN han YUXIANG JIA TONGHAO LIU TIANSHUO QIU SAI SUI YONGFENG LI MINGBAO YAN shaobo QU CHENG-WEI QIU Shaanxi Key Laboratory of Artificially-Structured Functional Materials and Devices Air Force Engineering UniversityXi’an 710051China Department of Electrical and Computer Engineering National University of SingaporeSingapore 117583Singapore NUS Suzhou Research Institute(NUSRI) Suzhou 215000China

Metasurface has provided unprecedented freedoms in manipulating electromagnetic(EM) waves, exhibiting fascinating functions. Conventionally, these functions are implemented right on metasurfaces, where spatial modulations on EM wave amplitudes or phases are achieved by meta-atoms. This study proposes the concept of virtual metasurface(VM), which is formed by arrays of foci away from the entity metasurface. Unlike conventional metasurfaces, spatial modulations on the amplitudes or phases of EM waves occur in the air, with a focal length distance from the entity metasurface. As a proof of concept, we demonstrated a transmissive VM. The entity metasurface consists of transmissive focusing metasurface tiles(TFMTs) with the same focal length. Two TFMTs were designed with phase difference π to enable the most typical checkerboard configuration. The TFMTs were assembled to form the entity metasurface, whereas their foci formed the VM. Due to the π phase difference among adjacent foci, EM propagation along the normal direction was cancelled, leading to four tilted far-field beams. The concept of VM can be readily extended to higher frequencies from terahertz to optical regimes and may find wide applications in communication, camouflage, and other fields.

关键词： surface. surfaces proof

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两种干燥方式对麦绿素粉品质的影响

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食品与生物技术学报 2015年第8期34卷 822-827页

作者：高甜张慜韩宇斌黄少波江南大学食品学院江苏无锡214122 海通食品集团股份有限公司浙江慈溪315300

以冷冻的嫩大麦苗为原料,研究真空冷冻干燥和喷雾干燥对麦绿素粉的溶解性、堆积密度、平均粒径、色差和关键组分叶绿素、黄酮、SOD酶活性及抗氧化性的影响。结果发现:在物理特性方面,喷雾干燥的麦绿素粉溶解性较好、堆积密度较大、平均... 详细信息

以冷冻的嫩大麦苗为原料,研究真空冷冻干燥和喷雾干燥对麦绿素粉的溶解性、堆积密度、平均粒径、色差和关键组分叶绿素、黄酮、SOD酶活性及抗氧化性的影响。结果发现:在物理特性方面,喷雾干燥的麦绿素粉溶解性较好、堆积密度较大、平均粒径较小、色泽较暗;在关键组分方面,喷雾干燥的麦绿素粉的叶绿素含量、黄酮含量、SOD酶活性分别是真空冻干麦绿素粉的56.7%、68.1%、47.9%;抗氧化性方面,真空冷冻干燥的麦绿素粉还原力和清除DPPH自由基的能力均大于喷雾干燥粉。因此,要得到粒径小、溶解性好的麦绿素粉适宜选择喷雾干燥,若要得到营养价值高、色泽好的麦绿素粉适宜选择真空冷冻干燥。

关键词：真空冷冻干燥喷雾干燥麦绿素粉关键组分抗氧化性

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危险空间碎片的天基激光雷达探测

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红外与激光工程 2012年第5期41卷 1244-1248页

作者：刘春波赵少博韩香娥西安电子科技大学理学院陕西西安710071 西北大学信息科学与技术学院陕西西安710127

小尺度危险空间碎片(厘米量级)是空间碎片监测的难点之一。针对厘米级空间碎片的探测需求,提出了一种基于天基激光雷达的主动探测新方案。该方案对激光强度进行宽带射频调制,并采用光学相干零差检测方式,通过chirp强度调制信号来获取空... 详细信息

小尺度危险空间碎片(厘米量级)是空间碎片监测的难点之一。针对厘米级空间碎片的探测需求,提出了一种基于天基激光雷达的主动探测新方案。该方案对激光强度进行宽带射频调制,并采用光学相干零差检测方式,通过chirp强度调制信号来获取空间碎片的距离和速度信息,在提高接收信噪比的同时简化了系统结构。首先简要介绍了该激光雷达的系统组成和工作原理,分析研究了系统在不同条件下的探测性能,并与传统直接检测激光雷达的探测性能进行了对比。理论分析和仿真结果表明,该探测方案是可行和有效的,对空间碎片的有效探测距离可达50 km以上。

关键词：空间碎片激光雷达零差检测强度调制

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Whole-genome sequencing provides insights into the genetic diversity and domestication of bitter gourd(Momordica spp.)

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Horticulture Research 2020年第1期7卷 1758-1768页

作者： Junjie Cui Yan Yang shaobo Luo Le Wang Rukui Huang Qingfang Wen Xiaoxia han Nansheng Miao Jiaowen Cheng Ziji Liu Changyuan Zhang Chengcheng Feng Haisheng Zhu Jianwen Su Xinjian Wan Fang Hu Yu Niu Xiaoming Zheng Yulan Yang Dai Shan Zhensheng Dong Weiming He Narinder P.S.Dhillon Kailin Hu College of Horticulture South China Agricultural University/State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources/Key Laboratory of Biology and Genetic Improvement of Horticultural Crops(South China)Ministry of Agriculture and Rural Affairs510642 GuangzhouChina Tropical Crop Genetic Resources Institute Chinese Academy of Tropical Agricultural Sciences571737 DanzhouChina Vegetable Research Institute Guangdong Academy of Agricultural Sciences510640 GuangzhouChina BGI Genomics BGI-Shenzhen518083 ShenzhenChina Vegetable Research Institute Guangxi Academy of Agricultural Sciences530007 NanningChina Crop Research Institute Fujian Academy of Agricultural Sciences350013 FuzhouChina Institute of Vegetable Research Hunan Academy of Agricultural Sciences410125 ChangshaChina Institute of Vegetables and Flowers Jiangxi Academy of Agricultural Sciences330200 NanchangChina World Vegetable Center East and Southeast AsiaResearch and Training StationKasetsart UniversityKamphaeng SaenNakhon Pathom 73140Thailand

Bitter gourd(Momordica charantia)is a popular cultivated vegetable in Asian and African *** reveal the characteristics of the genomic structure,evolutionary trajectory,and genetic basis underlying the domestication of bitter gourd,we performed whole-genome sequencing of the cultivar Dali-11 and the wild small-fruited line TR and resequencing of 187 bitter gourd germplasms from 16 *** major gene clusters(Bi clusters)for the biosynthesis of cucurbitane triterpenoids,which confer a bitter taste,are highly conserved in cucumber,melon,and *** analysis among cucurbit genomes revealed that the Bi cluster involved in cucurbitane triterpenoid biosynthesis is absent in bitter *** analysis revealed that the TR group,including 21 bitter gourd germplasms,may belong to a new species or subspecies independent from ***,we found that the remaining 166 *** germplasms are geographically differentiated,and we identified 710,412,and 290 candidate domestication genes in the South Asia,Southeast Asia,and China populations,*** study provides new insights into bitter gourd genetic diversity and domestication and will facilitate the future genomics-enabled improvement of bitter gourd.

关键词： insight cluster Whole

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