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Optimizing temperature coefficient of Sm_(2)Co_(17)-type magnets through adjusting the isothermal aging process

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Journal of Rare Earths 2024年第11期42卷 2097-2104,I0004页

作者： Chao Wang Die Hu Qiangfeng Li Yikun Fang Meng Zheng Lei Wang hongsheng chen Lei Zhao Haizhou Wang Minggang Zhu Wei Li Division of Functional Materials Research Central Iron and Steel Research InstituteBeijing100081China Shanghai Aerospace Control Technology Institute Shanghai201109China Beijing Advanced Innovation Center for Materials Genome Engineering Central Iron and Steel Research InstituteBeijing100081China Beijing Key Laboratory of Metal Materials Characterization Central Iron and Steel Research InstituteBeijing100081China

The high-temperature magnetic perfo rmance and micro structure of Sm_(1-x)Gd_(x)(Co_(bal)Fe_(0.09)Cu_(0.09)Zr_(0.025))_(7.2)(x=0.3,0.5) magnets were *** the isothermal aging time decreasing from 11 to 3 h,the temperature coefficient of intrinsic coercivity in the temperature range of 25-500℃,β_(25-500℃),was optimized from -0,167%/℃ to-0.112%/℃ for x=0.3 *** noticeable enhancement(~33%) of temperature stability is correlated with the increased content of 1:5H cell boundary phase and its relatively high Curie temperature as ***,for the x=0.5 magnet,it is found that the presence of Sm_(5)Co_(19) phases and wider nanotwin variants hinder the formation of 1:5H cell boundary *** insufficient 1:5H is not beneficial to the proper redistribution of Cu in cell boundary,making the x=0.5 magnet difficult to achieve higher temperature ***,the approach of adjusting the isothermal aging process can offer guidance for attaining superior magnetic performance in the temperature range from 25 to 500℃ for Gd-substituted Sm_(2)Co_(17)-type magnets.

关键词： Rare earths Sm_(2)Co_(17)-type magnets Isothermal aging process Temperature coefficient of intrinsic coercivity

Revealing the Transformation Invariance of Full-Parameter Omnidirectional Invisibility Cloaks

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Electromagnetic Science 2023年第2期1卷 54-60页

作者： Bin Zheng Huan Lu Chao Qian Dexin Ye Yu Luo hongsheng chen Interdisciplinary Center for Quantum Information State Key Laboratory of Extreme Photonics and InstrumentationZJUHangzhou Global Scientific and Technological Innovation CenterZhejiang UniversityHangzhou 310027China International Joint Innovation Center The Electromagnetics Academy at Zhejiang UniversityZhejiang UniversityHaining 314400China Key Lab.of Advanced Micro/Nano Electronic Devices&Smart Systems of Zhejiang Jinhua Institute of Zhejiang UniversityZhejiang UniversityJinhua 321099China Shaoxing Institute of Zhejiang University Zhejiang UniversityShaoxing 312000China School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore 639798Singapore

Searching for an optimal solution among many nonunique answers provided by transformation optics is critical for many branches of research,such as the burgeoning research on invisibility *** past decades have witnessed rapid development of transformation optics,and different kinds of invisibility cloaks have been designed and ***,the available cloaks realized thus far have been mostly demonstrated with reduced parameters,which greatly impact the predefined cloaking ***,we report a general design strategy to realize full-parameter omnidirectional cloaks that can hide arbitrarily shaped objects in free *** approach combines a singular transformation with transformation-invariant *** cloaking device with extreme parameters is implemented using a metallic array *** the experiment,two cloak samples are designed and fabricated,one with nondiscrete cloaking regions and the other with separated hidden ***-unit transmission of electromagnetic waves with arbitrary incident angles is experimentally demonstrated along with significantly suppressed *** work challenges the prevailing paradigms of invisibility cloaks and provides deep insight into how transformation optics could be harnessed to obtain easily-accessible metadevices.

关键词： Transformation optics Invisibility cloaks Full-parameter Omnidirectional

Photonic matrix multiplication lights up photonicaccelerator and beyond

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Light(Science & Applications) 2022年第2期11卷 158-178页

作者： Hailong Zhou Jianji Dong Junwei cheng Wenchan Dong Chaoran Huang Yichen Shen Qiming Zhang Min Gu Chao Qian hongsheng chen Zhichao Ruan Xinliang Zhang Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China Department of Electronic Engineering The Chinese University of Hong KongShatinHong KongChina Lightelligence Hangzhou 311121China Institute of Photonic Chips University of Shanghai for Science and TechnologyShanghai 200093China Centre for Artificial-Intelligence Nanophotonics School of Optical-Electrical and Computer EngineeringUniversity of Shanghai for Science and TechnologyShanghai 200093China Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical InstrumentationZJUHangzhou Global Scientific and Technological Innovation CenterZJU-UIUC InstituteZhejiang UniversityHangzhou 310027China Interdisciplinary Center of Quantum Information State Key Laboratory of Modern Optical Instrumentationand Zhejiang Province Key Laboratory of Quantum Technology and DeviceDepartment of PhysicsZhejiang UniversityHangzhou 310027China

Matrix computation,as a fundamental building block of information processing in science and technology,contributes most of the computational overheads in modern signal processing and artificial intelligence *** accelerators are designed to accelerate specific categories of computing in the optical domain,especially matrix multiplication,to address the growing demand for computing resources and *** matrix multiplication has much potential to expand the domain of telecommunication,and artificial intelligence benefiting from its superior *** research in photonic matrix multiplication has flourished and may provide opportunities to develop applications that are unachievable at present by conventional electronic *** this review,we first introduce the methods of photonic matrix multiplication,mainly including the plane light conversion method,Mach–Zehnder interferometer method and wavelength division multiplexing *** also summarize the developmental milestones of photonic matrix multiplication and the related ***,we review their detailed advances in applications to optical signal processing and artificial neural networks in recent ***,we comment on the challenges and perspectives of photonic matrix multiplication and photonic acceleration.

关键词： interferometer beyond matrix

Unconventional Weyl exceptional contours in non-Hermitian photonic continua

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Photonics Research 2021年第12期9卷 2435-2442页

作者： QINGHUI YAN QIAOLU chen LI ZHANG RUI XI hongsheng chen YIHAO YANG Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical InstrumentationZJU-Hangzhou Global Scientific and Technological Innovation CenterZhejiang UniversityHangzhou 310027China International Joint Innovation Center Key Laboratory of Advanced Micro/Nano Electronic Devices&Smart Systems of ZhejiangThe Electromagnetics Academy at Zhejiang UniversityZhejiang UniversityHaining 314400China

Unconventional Weyl points with topological charges higher than 1 can transform into various complex unconventional Weyl exceptional contours under non-Hermitian ***,theoretical studies of these exceptional contours have been limited to tight-binding ***,we propose to realize unconventional Weyl exceptional contours in photonic continua—non-Hermitian anisotropic chiral plasma,based on ab initio calculation by Maxwell’s *** perturbing in-plane permittivity,an unconventional Weyl point can transform into a quadratic Weyl exceptional ring,a type I Weyl exceptional chain with one chain point,a type II Weyl exceptional chain with two chain points,or other *** metamaterials with effective constitutive parameters are proposed to implement these unconventional Weyl exceptional *** work paves a way toward exploration of exotic physics of unconventional Weyl exceptional contours in non-Hermitian topological photonic continua.

关键词： exceptional topological constitutive

Experimental Realization of an Extreme-Parameter Omnidirectional Cloak

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Research 2019年第1期2019卷 678-685页

作者： Bin Zheng Yihao Yang Zheping Shao Qinghui Yan Nian-Hai Shen Lian Shen Huaping Wang Erping Li Costas MSoukoulis hongsheng chen Key Lab.of Advanced Micro/Nano Electronic Devices&Smart Systems of Zhejiang College of Information Science and Electronic EngineeringZhejiang UniversityHangzhou 310027China State Key Laboratory of Modern Optical Instrumentation and Te Electromagnetics Academy at Zhejiang University Zhejiang UniversityHangzhou 310027China Department of Physics and Astronomy and Ames Laboratory-U.S.DOE Iowa State University AmesIA 50011USA Institute of Marine Electronics Engineering Zhejiang UniversityHangzhou 310058China Institute of Electronic Structure and Laser FORTH71110 HeraklionCreteGreece

An ideal transformation-based omnidirectional cloak always relies on metamaterials with extreme parameters,which were previously thought to be too difcult to *** such a reason,in previous experimental proposals of invisibility cloaks,the extreme parameters requirements are usually abandoned,leading to inherent ***,we report on the frst experimental demonstration of an omnidirectional cloak that satisfes the extreme parameters requirement,which can hide objects in a homogenous *** of using resonant metamaterials that usually involve unavoidable absorptive loss,the extreme parameters are achieved using a nonresonant metamaterial comprising arrays of subwavelength metallic channels manufactured with 3D metal printing technology.A high level transmission of electromagnetic wave propagating through the present omnidirectional cloak,as well as signifcant reduction of scattering feld,is demonstrated both numerically and *** work may also inspire experimental realizations of the other full-parameter omnidirectional optical devices such as concentrator,rotators,and optical illusion apparatuses.

关键词： directional extreme realization

Nonlinear all-optical modulator based on non-Hermitian PT symmetry

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Photonics Research 2022年第4期10卷 980-988页

作者： Hongbin Ma Dongdong Li Nanxuan Wu Yiyun Zhang hongsheng chen Haoliang Qian Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical InstrumentationCollege of Information Science and Electronic EngineeringZhejiang UniversityHangzhou 310027China ZJU-Hangzhou Global Science and Technology Innovation Center Key Laboratory of Advanced Micro/Nano Electronic Devices&Smart Systems of ZhejiangZhejiang UniversityHangzhou 310027China International Joint Innovation Center ZJU-UIUC InstituteZhejiang UniversityHaining 314400China

All-optical modulators with ultrahigh speed are in high demand due to the rapid development of optical interconnection and computation. However, due to weak photon–photon interaction, the advancement of all-optical modulators is consequently hampered by the large footprint and high power consumption. In this work, the enhanced sensitivity around an exceptional point(EP) from parity-time(PT) symmetry theory is initiatively introduced into a nonlinear all-optical modulator design. Further, a non-Hermitian all-optical modulator based on PT symmetry is proposed, which utilizes the large Kerr nonlinearity from indium tin oxide(ITO) in its epsilon-near-zero(ENZ) region. The whole system is expected to operate around EP, giving rise to the advantages of nanoscale integration and large modulation depth. This presented modulator with high efficiency and high-speed all-optical control can be commendably extended to the design methodology of various nanostructures and further prompt the development of all-optical signal processing.

关键词： modulator optical interconnection

Ideal type-Ⅱ Weyl points in topological circuits

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National Science Review 2021年第7期8卷 205-210页

作者： Rujiang Li Bo Lv Huibin Tao Jinhui Shi Yidong Chong Baile Zhang hongsheng chen Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical Instrumentation College of Information Science and Electronic Engineering Zhejiang University Key Laboratory of In-Fiber Integrated Optics of Ministry of Education College of Physics and Optoelectronic Engineering Harbin Engineering University 4. School of Software Engineering Xi'an Jiaotong University Centre for Disruptive Photonic Technologies Nanyang Technological University ZJU-Hangzhou Global Science and Technology Innovation Center Key Laboratory of Advanced Micro/Nano Electronic Devices & Smart Systems of Zhejiang Zhejiang University Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University

Weyl points(WPs), nodal degenerate points in three-dimensional(3 D) momentum space, are said to be‘ideal’ if they are symmetry-related and well-separated, and reside at the same energy and far from nontopological bands. Although type-II WPs have unique spectral characteristics compared with type-I counterparts, ideal type-II WPs have not yet been reported because of a lack of an experimental platform with enough flexibility to produce strongly tilted dispersion bands. Here, we experimentally realize a topological circuit that hosts only topological bands with a minimal number of four ideal type-II WPs. By stacking two-dimensional(2 D) layers of inductor-capacitor(LC) resonator dimers with the broken parity inversion symmetry(P), we achieve a strongly tilted band structure with two group velocities in the same direction, and topological surface states in an incomplete bandgap. Our results establish an ideal system for the further study of Weyl physics and other exotic topological phenomena.

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STUDIES ON PATHOGENESIS OF WAARDENBURG SYNDROME TYPE Ⅱ AND TIETZ SYNDROME RESULTING FROM MITF GENE MUTATIONS

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Journal of Otology 2013年第2期8卷 97-103页

作者： ZHANG Hua LI Jiada LUO Hunjin chen hongsheng MEI Lingyun HE Chufeng JIANG Lu FENG Yong Department of Otolaryngology First Affiliated HospitalXinjiang Medical University State Key Laboratory of Medical Genetics Central South University Department of Otolaryngology Xiangya Hospital Central South University

Microphthalmia-associated transcription factor (MITF) controls melanocyte survival and differentiation through directly regulating the expression of the tyrosinase (TYR) and tyrosinase-related proteins 1 and 2 (TYRP1 and TYRP2) genes. MITF mutations have been reported to result in an abnormal melanocyte devel-opment and lead to Waardenburg syndrome type 2 (WS2), characterized by variable degrees of sensorineu-ral hearing loss and patchy regional distribution of hypopigmentation. Recently, MITF was also indicated as a causative gene for a more severe syndrome, the Tietz Syndrome (TS), characterized by generalized hy-popigmentation and complete hearing loss. However, few functional studies have been performed to com-pare the diseases-causing mutations. Here, we analyzed the in vitro activity of two recent identified WS2-as-sociated mutation (p.R217I and p.T192fsX18) and one TS-associated mutation p.N210K. The R217I MITF retained partial activity, normal DNA-binding ability and nuclear distribution, whereas the T192fsX18 MITF failed to activate TYR promoter due to loss of DNA-binding activity, and aberrant subcellular localization. The aberrant subcellular localization of T192fsX18 MITF may be caused by deletion of a putative nuclear localization signal (NLS) at aa 213-218 (ERRRRF). Indeed, MITF with deletion of the NLS fragment failed to translocate into the nucleus and activated the TYR promoter. Tagging this NLS to GFP promoted the green fluorescence protein (GFP) translocated into the nucleus. The surprising finding of our study is that a TS-as-sociated MITF mutation, N210K, showed comparable in vitro activity as WT. Thus, the possible involve-ment of MITF in TS and its underlying mechanisms still need further investigation.

关键词： Waardenburg syndrome Teitz syndrome MITF mutation haploinsufficiency

Autonomous aeroamphibious invisibility cloak with stochastic-evolution learning

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Advanced Photonics 2024年第1期6卷 64-72页

作者： Chao Qian Yuetian Jia Zhedong Wang Jieting chen Pujing Lin Xiaoyue Zhu Erping Li hongsheng chen Zhejiang University ZJU-UIUC InstituteInterdisciplinary Center for Quantum InformationState Key Laboratory of Extreme Photonics and InstrumentationHangzhouChina Zhejiang University ZJU-Hangzhou Global Science and Technology Innovation CenterKey Laboratory of Advanced Micro/Nano Electronic Devices and Smart Systems of ZhejiangHangzhouChina Zhejiang University Jinhua Institute of Zhejiang UniversityJinhuaChina

Being invisible ad libitum has long captivated the popular imagination,particularly in terms of safeguarding modern high-end instruments from potential *** ago,the advent of metamaterials and transformation optics sparked considerable interest in invisibility cloaks,which have been mainly demonstrated in ground and waveguide ***,an omnidirectional flying cloak has not been achieved,primarily due to the challenges associated with dynamic synthesis of metasurface *** demonstrate an autonomous aeroamphibious invisibility cloak that incorporates a suite of perception,decision,and execution modules,capable of maintaining invisibility amidst kaleidoscopic backgrounds and neutralizing external *** physical breakthrough lies in the spatiotemporal modulation imparted on tunable metasurfaces to sculpt the scattering field in both space and frequency *** intelligently control the spatiotemporal metasurfaces,we introduce a stochastic-evolution learning that automatically aligns with the optimal solution through maximum probabilistic *** a fully self-driving experiment,we implement this concept on an unmanned drone and showcase adaptive invisibility in three canonical landscapes-sea,land,and air-with a similarity rate of up to 95%.Our work extends the family of invisibility cloaks to flying modality and inspires other research on material discoveries and homeostatic meta-devices.

关键词： intelligent metasurfaces optical materials and structures deep learning