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Observation of accurately designed bound states in the continuum in momentum space

Photonics Research 2024年第4期12卷 638-647页

作者： JIAJU WU JINGGUANG CHEN XIN QI ZHIWEI GUO JIAJUN WANG FENG WU YONG SUN YUNHUI LI HAITAO jianG LEI SHI jian zi HONG CHEN MOE Key Laboratory of Advanced Micro-Structured Materials School of Physics Science and EngineeringTongji UniversityShanghai 200092China State Key Laboratory of Surface Physics Key Laboratory of Micro-and Nano-Photonic Structures(Ministry of Education)and Department of PhysicsFudan UniversityShanghai 200433China School of Optoelectronic Engineering Guangdong Polytechnic Normal UniversityGuangzhou 510665China

Bound states in the continuum(BICs)in artificial photonic structures have received considerable attention since they offer unique methods for the extreme field localization and enhancement of light-matter interactions.Usually,the symmetry-protected BICs are located at high symmetric points,while the positions of accidental BICs achieved by tuning the parameters will appear at some points in momentum space.Up to now,to accurately design the position of the accidental BIC in momentum space is still a challenge.Here,we theoretically and experimentally demonstrate an accurately designed accidental BIC in a two-coupled-oscillator system consisting of bilayer gratings,where the optical response of each grating can be described by a single resonator model.By changing the interlayer distance between the gratings to tune the propagation phase shift related to wave vectors,the position of the accidental BIC can be arbitrarily controlled in momentum space.Moreover,we present a general method and rigorous numerical analyses for extracting the polarization vector fields to observe the topological properties of BICs from the polarization-resolved transmission spectra.Finally,an application of the highly efficient second harmonic generation assisted by quasi-BIC is demonstrated.Our work provides a straightforward strategy for manipulating BICs and studying their topological properties in momentum space.

关键词： polarization tuning resonator

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Synthetic Control of Thorium Metal-Organic Frameworks for Sequencing and Sensing of Radioiodine Species

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Chinese Journal of Chemistry 2024年第1期42卷 20-28,I0004页

作者： Yu Ju zi-jian Li xue Wang Jie Qiu Yiuhon Chan Zhi-Hui Zhang Mingyang He jian Lin jiangsu Key Laboratory of Advanced Catalytic Materials and Technology Changzhou UniversityNo.21Gehu Middle RoadChangzhouJiangsu 213164China Schoolof Nuclear Science and Technology Xi'an Jiaotong UniversityNo.28West Xianning RoadXianShaanxi 710049China Key Laboratoryof Interfacial Physics and Technology Shanghai Institute of Applied PhysicsChinese Academy of Sciences2019JiaLuoRoadShanghai 201800China

Exploring the physiochemical properties and expanding the applications of actinide-containing materials is paramount to address the escalating challenge of radioactive waste accumulation.However,unlocking the full potential of these materials is largely crippled by the radiotoxicity of the actinides.We report here two porous and luminescent thorium-based metal-organic frameworks(Th-BITD-1 and Th-BITD-2)that serve as a bifunctional platform for sequencing and sensing of radioiodine,a much more radioactive fission product discharged during the nuclear fuel reprocessing.In particular,Th-BITD-1 displays better iodine uptake performance than Th-BITD-2 via the solution-based process and vapor diffusion with the maximum adsorption capacities of 831 and 1099 mg/g,respectively.Fur thermore,Th-BITD-1 can function as a highly sensitive luminescence sensor for iodate with a quenching constant(Ksv)of 6.6(5)×10^(3) M^(-1)and a detection limit of 2.02μM,respectively,outperforming 2.96(6)×10^(3)M^(-1)and 10.5μM of Th-BITD-2.Moreover,a positive correlation between the sensing efficacy and the iodate adsorption capacity has been revealed.This work highlights the opportunity in designing novel actinide-based MOFs for their potential applications in radiological fields,e.g.,radionuclide separation and detection.

关键词： Thorium Metal-organic frameworks Adsorption Detection lodine Actinides Radiochemistry Luminescence

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Hot Compression Behavior and Tensile Property of a Novel Ni-Co-Based Superalloy Prepared by Electron Beam Smelting Layered Solidification Technology

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Acta Metallurgica Sinica(English Letters) 2024年第2期37卷 283-292页

作者： Yong-Chao Gai Rui Zhang Chuan-Yong Cui zi-jian Zhou Yi Tan Yi-Zhou Zhou Xiao-Feng Sun Key Laboratory of Materials Modification by Laser Ionand Electron Beams(Ministry of Education)School of Materials Science and EngineeringDalian University of TechnologyDalian116024China Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang110016China

The hot compression behavior and tensile strength after compression of a new Ni-Co-based superalloy produced using electron beam smelting layered(EBSL)solidification technology were investigated.Isothermal compression tests were performed at temperatures of 1120℃and 1150℃,with strain rates of 1 s^(-1) and 0.01 s^(-1),reaching a true strain of 0.51.Tensile strength was evaluated at room temperature.The results revealed that this EBSL technology accelerates dynamic recrystallization(DRX),without compromising the strength of alloy.A significant correlation between the volume fraction of DRX and the strain rate was observed,with higher fractions at lower strain rates,leading to higher tensile strength.Additionally,at the same strain rate,the specimens compressed at 1120℃exhibited higher tensile strength due to undissolvedγ′precipitates.After solution and aging heat treatment,the alloy maintained high tensile strength.The results suggested that the EBSL Ni-Co-based superalloy offers excellent prospects for practical applications.

关键词： Ni-Co-based superalloy Hot deformation Electron beam smelting Tensile strength

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Bound states in the continuum based on the total internal reflection of Bloch waves

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National Science Review 2023年第1期10卷 178-186页

作者： Peng Hu Chongwu Xie Qianju Song Ang Chen Hong Xiang Dezhuan Han jian zi College of Physics Chongqing University State Key Laboratory of Surface Physics Key Laboratory of Microand Nano-Photonic Structures (Ministry of Education) and Department of Physics Fudan University Chongqing Key Laboratory for Strongly Coupled Physics

A photonic-crystal slab can support bound states in the continuum(BICs) that have infinite lifetimes but are embedded into the continuous spectrum of optical modes in free space.The formation of BICs re quires a total internal reflection(TIR) condition at both interfaces between the slab and the free space.Here,we show that the TIR of Bloch waves can be directly obtained based on the generalized Fresnel equations proposed.If each of these Bloch waves picks up a phase with integer multiples of 2π for traveling a round trip,light can be perfectly guided in the slab,namely forming a BIC.A BIC solver with low computational complexity and fast convergence speed is developed,which can also work efficiently at high frequencies beyond the diffraction limit where multiple radiation channels exist.Two examples of multi-channel BICs are shown and their topological nature in momentum space is also revealed.Both can be attributed to the coincidence of the topological charges of far-field radiations from different radiation channels.The concept of the generalized TIR and the TIR-based BIC solver developed offer highly effective approaches for explorations of BICs that could have many potential applications in guided-wave optics and enhanced light-matter interactions.

关键词： bound states in the continuum total internal reflection Bloch waves generalized Fresnel equations topological charges

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High-efficiency nonlocal reflection-type vortex beam generation based on bound states in the continuum

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National Science Review 2023年第5期10卷 201-207页

作者： Tongyu Li Jiajun Wang Wenjie Zhang Xinhao Wang Wenzhe Liu Lei Shi jian zi State Key Laboratory of Surface Physics Key Laboratory of Micro-and Nano-Photonic Structures (Ministry of Education) and Department of PhysicsFudan University Department of Physics The Hong Kong University of Science and Technology

Momentum-space polarization vortices centered at symmetry-protected bound states in the continuum of a periodic structure,e.***.photonic crystal slab,provide a novel nonlocal approach to generate vortex beams.This approach enjoys a great convenience of no precise alignment requirements,although the generation efficiency of the nonlocal generators requires further optimization before the practical application.In this work,we propose a temporal-coupled-mode-theory-based guideline for high-efficiency nonlocal reflection-type vortex generator design.The conversion efficiency of the vortex beam is found to be limited by the ratio of the radiative loss to the intrinsic absorption in practical systems.To increase this ratio through mode selection and structure design,the photonic crystal slabs are theoretically designed and experimentally characterized,showing a maximum on-resonance conversion efficiency of up to 86%.Combining high efficiency with simple fabrication and no re quirement for precise alignment,reflection-type photonic crystal slabs could offer a new and competitive way to generate vortex beams flexibly.

关键词： photonic crystal slab vortex beam bound states in the continuum

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Mitochondria-targeted nano-AIEgens as a powerful inducer for evoking immunogenic cell death

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Chinese Chemical Letters 2024年第5期35卷 338-343页

作者： Kun-Heng Li Hong-Yang Zhao Dan-Dan Wang Ming-Hui Qi zi-jian Xu Jia-Mi Li Zhi-Li Zhang Shi-Wen Huang Key Laboratory of Biomedical Polymers of Ministry of Education Department of ChemistryWuhan UniversityWuhan 430072China

AIEgens can serve as an effective platform for the construction of photosensitizer-based immunogenic cell death(ICD)inducers.To date,several mitochondria or endoplasmic reticulum(ER)-targeted aggregationinduced emission(AIE)molecules have been developed and have evoked massive ICD in cells.However,due to the complex physicochemical environment in cells,these small AIE molecules cannot maintain a stable aggregate state,which not only affects the fluorescence intensity of the photosensitizer but also decreases the generation of reactive oxygen species(ROS),and thus reducing the effect of the photosensitizer to elicit ICD.AIEgen-based nanomicelles,which maintain a stable micellar structure,can prevent defects of AIE molecules in photodynamic therapy(PDT)applications.Therefore,in this study,a mitochondria-targeted AIE nanophotosensitizer was synthesized and used as a highly potent ICD inducer for vaccine preparation and tumor prevention.

关键词： Aggregation induced emission Photodynamic therapy Immunogenic cell death Reactive oxygen species Nanophotosensitizer Mitochondria

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数据法律冲突中适用国际礼让原则的理论基础、实践应用与中国镜鉴

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河北法学 2024年第5期42卷 164-182页

作者：安子健中国政法大学国际法学院北京100091

近年来国家间数据主权倾轧导致数据法律冲突愈演愈烈。由荷兰法学家优利克·胡伯提出、美国法学家柯里完善的“国际礼让原则”经过法院的不断演绎,逐渐细化为以存在真实法律冲突为前提、以衡量各方利益为方法、以主权的自我约束为本质... 详细信息

近年来国家间数据主权倾轧导致数据法律冲突愈演愈烈。由荷兰法学家优利克·胡伯提出、美国法学家柯里完善的“国际礼让原则”经过法院的不断演绎,逐渐细化为以存在真实法律冲突为前提、以衡量各方利益为方法、以主权的自我约束为本质的具体规则。国际礼让原则服务于政治目标的单边主义倾向不言而喻,但是其多元化分析的特点加上对主权权力的克制,在协调国家之间数据法律冲突方面有突出的作用。在数据法律冲突主要存在的数据立法的域外适用、数据执法机构获取域外数据和跨境数据企业在一国执行他国数据相关判决三个情形当中,国际礼让的适用已经体现出了维护本国固有利益、缓和数据主权冲突的正面意义。国际礼让原则虽然不是我国正式的法律渊源,但在我国走向全面开放的历史新格局中,在立法、执法、司法方面适当借鉴国际礼让的适用规则,既符合我国谋求国际合作的一贯立场,也能为我国提升国际话语权、建立负责的大国司法形象提供帮助。

关键词：国际礼让数据主权数据法律冲突利益衡量跨境数据流动

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MRD对急性髓系白血病预后评价作用的研究进展

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中国实验血液学杂志 2024年第2期32卷 625-629页

作者：刘恒李子坚兰州大学第一临床医学院甘肃兰州730000 兰州大学第一医院血液科甘肃兰州730000

急性髓系白血病(AML)是异质性极高的一组血液系统恶性肿瘤。虽然相当数量的AML患者经化疗、靶向治疗联合/不联合HSCT而获得长期生存,但是仍有部分患者难以达到缓解或缓解后早期复发,因此,细化风险分层并实现个体化治疗的预后指标具有重... 详细信息

急性髓系白血病(AML)是异质性极高的一组血液系统恶性肿瘤。虽然相当数量的AML患者经化疗、靶向治疗联合/不联合HSCT而获得长期生存,但是仍有部分患者难以达到缓解或缓解后早期复发,因此,细化风险分层并实现个体化治疗的预后指标具有重要意义。随着AML预后指标研究的日渐深入,预后分层也随之不断改进完善,由依赖MICM分型指标发展到联合治疗后MRD等疾病生物学特征指标的综合评价。本文综述了AML预后指标的发展及MRD对AML预后评价作用的研究进展,以帮助更好地识别不同风险的患者,有利于精准诊治方案的制订和实施。

关键词：急性髓系白血病微小残留病进展

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Optimize performance of a diffractive neural network by controlling the Fresnel number

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Photonics Research 2022年第11期10卷 2667-2676页

作者： MINJIA ZHENG LEI SHI jian zi State Key Laboratory of Surface Physics Key Laboratory of Micro-and Nano-Photonic Structures(Ministry of Education)and Department of PhysicsFudan UniversityShanghai 200433China Institute for Nanoelectronic Devices and Quantum Computing Fudan UniversityShanghai 200433China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China

To achieve better performance of a diffractive deep neural network, increasing its spatial complexity(neurons and layers) is commonly used. Subject to physical laws of optical diffraction, a deeper diffractive neural network(DNN) would be more difficult to implement, and the development of DNN is limited. In this work, we found controlling the Fresnel number can increase DNN’s capability of expression and its spatial complexity is even less.DNN with only one phase modulation layer was proposed and experimentally realized at 515 nm. With the optimal Fresnel number, the single-layer DNN reached a maximum accuracy of 97.08% in the handwritten digits recognition task.

关键词： Fresnel controlling number

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双谐振环金属超表面中的连续域束缚态

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物理学报 2024年第5期73卷 316-324页

作者：王玥王豪杰崔子健张达篪西安理工大学陕西省超快光电技术与太赫兹科学重点实验室西安710048

超表面由于具备独特的电磁响应特性,在微波、太赫兹以及光学领域的应用十分广泛.在电磁超表面中构建连续域束缚态(bound states in the continuum,BIC)模式谐振可以产生尖锐的谐振透射峰,因此BIC被广泛用于设计具有高品质因子谐振的超表... 详细信息

超表面由于具备独特的电磁响应特性,在微波、太赫兹以及光学领域的应用十分广泛.在电磁超表面中构建连续域束缚态(bound states in the continuum,BIC)模式谐振可以产生尖锐的谐振透射峰,因此BIC被广泛用于设计具有高品质因子谐振的超表面.本文实验研究了一种支持准BIC(quasi-BIC,q-BIC)谐振的新型金属太赫兹超表面,通过设计两组金属开口谐振环(split ring resonators,SRRs)的结构参数来调节各自主导的谐振的工作频率,使不同模式谐振之间产生耦合,形成q-BIC模式谐振.并利用电磁场分布及其散射功率的多极分解的计算结果证明了不同模式的共振机制.在入射电磁波分别沿x,y偏振时,通过Jaynes-Cummings模型计算了两模式之间的归一化耦合强度比,分别为0.54%(x偏振)与4.42%(y偏振),解释了不同谐振模式的工作频率随SRRs器件结构参数改变而变化的规律.

关键词：超表面多极分解连续域束缚态太赫兹

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