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Passive on-chip isolators based on the thin-film lithium niobate platform

Chinese Physics B 2025年第3期34卷 408-413页

作者： Jiacheng Liu Gongyu Xia Qilin Hong Pingyu Zhu Kai-Kai Zhang keyu Xia Ping Xu Shiqiao Qin Zhihong Zhu College of Advanced Interdisciplinary Studies&Hunan Provincial Key Laboratory of Novel Nano Optoelectronic Information Materials and Devices National University of Defense TechnologyChangsha 410073China Institute for Quantum Information and State Key Laboratory of High-Performance Computing College of Computer Science and TechnologyNational University of Defense TechnologyChangsha 410073China College of Engineering and Applied Sciences National Laboratory of Solid State Microstructuresand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210023China

Optical isolators,the photonic analogs of electronic diodes,are essential for ensuring the unidirectional flow of light in optical systems,thereby mitigating the destabilizing effects of back ***-film lithium niobate(TFLN),hailed as“the silicon of photonics,”has emerged as a pivotal material in the realm of chip-scale nonlinear optics,propelling the demand for compact optical *** report a breakthrough in the development of a fully passive,integrated optical isolator on the TFLN platform,leveraging the Kerr effect to achieve an impressive 10.3 dB of isolation with a minimal insertion loss of 1.87 *** theoretical simulations have demonstrated that our design,when applied to a microring resonator with a Q factor of 5×10^(6),can achieve 20 dB of isolation with an input power of merely 8 *** advancement underscores the immense potential of lithium niobate-based Kerr-effect isolators in propelling the integration and application of high-performance on-chip lasers,heralding a new era in integrated photonics.

关键词： thin-film lithium niobate Kerr effect optical isolator

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Titanium nitrides as novel reactants for in-situ synthesis of TiB_(2)-based composites with improved properties

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Journal of Materials Science & technology 2023年第14期145卷 48-55页

作者： Ji Zou Huayue Liang Jingjing Liu Weimin Wang Fan Zhang Wei Ji Zhengyi Fu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Hubei Longzhong Laboratory Xiangyang 441000China School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China

A novel in-situ reactive approach based on the reactions among TiN,aluminum and boron has been developed to synthesize TiB_(2)-based composites including TiB_(2)-h BN(TB)and TiB_(2)-h BN-AlN(TBA).Fully dense ceramics with fine-grained microstructure were successfully obtained via spark plasma sintering at 1850℃/60 MPa/5 *** analysis suggests h BN flakes were homogenously distributed in the TiB_(2)*** AlN,however,they were elongated into plate-like grains during sintering,in which lots of defects in terms of stacking faults and twinning structures were *** mechanical and thermophysical properties of as-sintered ceramics were comprehensively investigated and ***-corporating AlN significantly improved the flexure strength,hardness,fracture toughness and thermal conductivity of TiB_(2)-h BN *** electrical conductivity of TB(3.06×10^(6)S/m)is larger than that of TBA(2.35×10^(6)S/m)at room temperature,but the value(6×10^(5)S/m)was lower than that of TBA(6.9×10^(5)S/m)at 1173 *** on the measurement of electrical and thermal conductivity,electron and phonon contributions to thermal conductivities of TB and TBA were calculated and their temperature dependences were illustrated.

关键词： Borides Microstructure Spark plasma sintering Mechanical property Thermo-physics property

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Bottom-up synthesis of 2D heterostructures enables effective polysulfides inhibition and conversion

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Nano Research 2023年第6期16卷 8488-8496页

作者： Ge Zhang Cheng Zhou Juncai Long Yan Li Lei Lv Kaijian Yan Xinhui Chen Chenxu Dong Xu Xu Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China International School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China

Due to the high theoretical capacity and energy density,lithium-sulfur(Li-S)batteries have good commercial ***,shuttle effect of soluble lithium polysulfides(LiPSs)formed by sulfur reduction has severely limited the further development of Li-S *** this work,the two-dimensional(2D)MXene-metal-organic framework(MOF)(Ti_(3)C_(2)T_(x)-CoBDC(BDC:1,4-benzenedicarboxylate))heterostructures were employed to modify the separator to inhibit the shuttle effect and facilitate the conversion of the soluble ***,a bottom-up synthesis strategy was adopted to synthesize the 2D MXene-MOF heterogeneous layered *** high specific surface area,in which the catalytic metal atoms not only restrain the shuttle effect of polysulfides but also exhibit excellent redox electrocatalytic *** cell with Ti_(3)C_(2)T_(x)-CoBDC@PP(PP:polypropylene)separator has a high initial capacity of 1255 mAh·g^(−1)at 0.5 *** the current density is 2 C,the battery has a capacity retention rate of 94.4%after 600 cycles,with the fading rate of only 0.01%per ***,with a sulfur loading of 7.5 mg·cm^(−2),the battery shows the discharge capacity of 1096 mAh·g^(−1)at 0.2 C and exhibits excellent cycling *** work offers novel insights into the application of MOF and MXene heterostructures in Li-S batteries.

关键词： nanosheets lithium-sulfur batteries MXenes modified separators shuttle inhibition

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Numerical Study of the Current Density on the Armature and Rail Interface with Dynamic Contact

Numerical Study of the Current Density on the Armature and R...

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International Conference of Electrical, Electronic and Networked Energy Systems, EENES 2024

作者： Xu, Jinghan Xia, Shengguo Chen, Lixue Ministry of Education Hubei Wuhan430074 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Hubei Wuhan430074 China School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789819620791

The electrical contact between the armature and rail is acknowledged as imperfect electrical contact (ImPEC), exhibiting characteristics distinct from bulk behavior. It is important to understand the current distribution of the ImPEC for future design and optimization. This paper proposes ImPEC boundary conditions by combining the contact layer model (CLM) and the Cooper-Mikic-Yoranovich model (CMYM), and the current distribution is numerically studied. Variations in the contact pressure and current density with time are analyzed. The results show a rapid increase in the contact pressure and area during the current ramp-up stage, being constant in the flat stage, and a gradual decline in the current ramp-down stage. The current path changes with the contact area, and the current shifts from the trailing edge to the leading edge over time. Additionally, comparative calculations are performed to analyze current variations under dynamic contact. Results suggest that the current distribution is influenced by magnetic diffusion and forced shifts of current caused by dynamic contact. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Threshold current density

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Review of spatial scale dispersion models (ATDMs) to simulate environmental dispersion and deposition of radionuclides and the overview of GIS coupling with dispersion models

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International Journal of advanced Nuclear Reactor Design and technology 2024年第4期6卷 256-280页

作者： Muhammad, Hussaini Xuan, Wang Wang, Mingjun Su, Guanghui School of Nuclear Science and Technology Shanxi Key Laboratory of Advanced Nuclear Energy and Technology State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China Abuja Nigeria

Estimation of the radiological consequences including the calculation of radiation doses to the exposed population requires numerical evaluation of atmospheric radioactive releases from nuclear facilities under accidental scenarios for implementation of adequate protective and other response actions to prevent or minimize severe deterministic effects and reduce the probability of occurrence of stochastic effects. This paper reviews various state-of-the-art spatial scale atmospheric dispersion models, known as the ATDMs, designed to evaluate atmospheric transport, dispersion, and depositions of radionuclide emissions from release sources. The ATDMs (atmospheric transport, dispersion, and deposition models) reviewed in this paper are FLEXPART, CALPUFF, LADAS, RASCAL, RIMPUFF, and HotSpot. These ATDMs are increasingly applied to perform probabilistic radiological risk assessment, which is one of the IAEA safety requirements for site evaluation of new NPP, and the calculated doses can be used to establish EPZs, an underlying basis of emergency preparedness. The numerical approaches, modeling methodology, advantages, limitations, scope of applications, and research investigations performed using these models in radiological and other environmental impact assessments within their scope of applications are presented. GIS has been widely recognized as a technique applied to aid the modeling of pollutant dispersion and visualization of model outputs in a spatial context, among other benefits. In nuclear accident consequence evaluation, spatial data provides key information such as accident location, range of radiological contamination, population density, etc, which are very important. This demonstrates the high significance of GIS-ATDMs coupling. Therefore, an overview of the coupling of dispersion models with GIS is also highlighted. © 2025 Xi'an Jiaotong University

关键词： Risk assessment

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A Symmetrical-Structure Fault Current Limiter for Bipolar DC Distribution Networks

A Symmetrical-Structure Fault Current Limiter for Bipolar DC...

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2023 IEEE PELS Students and Young Professionals Symposium, SYPS 2023

作者： Chen, Yangfan Zhang, Yu Huazhong University of Science and Technology State Key of Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Energering Wuhan China

ISBN: (纸本)9798350307832

In a bipolar DC distribution network, both the pole-to-ground fault (PGF) and the pole-to-pole fault (PPF) would threaten its security and stability. This paper proposes a symmetrical-structure fault current limiter (SSFCL) topology, which can help achieve fault riding through (FRT) of PGF and PPF in a bipolar DC distribution network. With the SSFCL, the rising speed of the fault current can be limited, thus ensuring the safety of the DC transformers (DCTs). Then the fault current can be hysteresis controlled within a required range, which provides an adequate fault criterion to locate the faulty load branch. The discharging path of the SSFCL can create a fault current zero point, enabling the solid-state switches to achieve zero-current switching (ZCS) when cleaning the faulty branch. In addition, with the SSFCL, the terminal voltages of the DCTs would not decay during the FRT process, which ensures the fast restoration of the power supply after the fault has been cleaned. The effectiveness of the SSFCL is verified on a ± 375 V bipolar DC experimental prototype. The SSFCL presented in this article provides a solution for the DC fault in a bipolar DC distribution network. © 2023 IEEE.

关键词： DC transformers

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Scan Path Optimization of Discrete Scanning Based on HE-GA in Proton Therapy 4

Scan Path Optimization of Discrete Scanning Based on HE-GA i...

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4th IEEE china International Youth Conference on Electrical engineering, CIYCEE 2023

作者： Wang, Xinze Tan, Ping Shen, Xinyi Lin, Yinjie Chen, Songbin Xiong, Haimin Qian, Zhihong Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Wuhan430074 China

ISBN: (纸本)9798350305562

Scan path optimization in proton therapy requires efficient intelligent optimization algorithms. In this study, we discuss the optimization of the genetic algorithm (GA) for scan path optimization from three aspects: generating initial paths using heuristic algorithms, optimizing the genetic parameters of GA, and incorporating an elite preservation strategy. We propose a heuristic elite-genetic algorithm (HE-GA) and compare it with commonly used simulated annealing (SA) and GA, finding that HE-GA demonstrates higher accuracy, better stability, and faster computation. Using HE-GA under discrete scanning, we analyze tumor cases under different scanning dead times and observe that optimizing the total scanning time by reducing the scanning dead time can lead to improvements. This enables repetitive scanning with the same duration as the zigzag scanning pattern, providing better protection for patients' critical organs. © 2023 IEEE.

关键词： Genetic algorithms

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Research on the electromagnetic Interference of Scanning Magnet Magnetic Field to Cable in Proton Therapy 4

Research on the Electromagnetic Interference of Scanning Mag...

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4th IEEE china International Youth Conference on Electrical engineering, CIYCEE 2023

作者： Shen, Xinyi Tan, Ping Wang, Xinze Lin, Yinjie Chen, Songbin Xiong, Haimin Qian, Zhihong Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Wuhan430074 China

ISBN: (纸本)9798350305562

Proton therapy is a new method to treat tumors. The main method of proton therapy is the pencil beam scanning (PBS), whose core component is the scanning magnets. The beam is deflected under the magnetic field of the scanning magnets. Various cables are arranged near the scanning magnets. The excitation current and magnetic field of the scanning magnets will cause electromagnetic interference to the surrounding cables. To reduce electromagnetic interference, the shielding structure is designed. In this paper, the type of cables near the scanning magnets is analyzed first. Then, using Computer Simulation technology (CST) CABLE STUDIO, the magnet magnetic field is modeled, the influence of the magnetic fields on the strong electrical cables, weak electrical cables and multi-channel signal cables are simulated. This paper further analyzes the influence factors of the shielding frame such as the layer thickness, the size and the shielding material on shielding effect. It is concluded that the shielding effect of coaxial cable is better than that of single cable. The larger the thickness of the shielding frame, the smaller the size, the larger the conductivity and relative permeability of the shielding material, the better the shielding effect. © 2023 IEEE.

关键词： Signal interference

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Active-passive radial-additive friction stir repairing of mechanical hole out of dimension tolerance of AZ31 magnesium alloy

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Journal of Magnesium and Alloys 2023年第9期11卷 3186-3199页

作者： Hua Liu Zhenlei Liu Shude Ji Yumei Yue Zhibo Dong Changlong Chen College of Aerospace Engineering Shenyang Aerospace UniversityShenyang 110136China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China

In order to avoid the depth increasing of repaired hole and eliminate the super-fine grain band in stir zone by radial-additive friction stir repairing(R-AFSR), a solid-state repairing technique of active-passive radial-additive friction stir repairing(AP-RAFSR) assisted by the truncated cone-shaped filling material was proposed in this study. The mechanical hole out of dimension tolerance of AZ31 magnesium alloy was chosen as the repaired object. The results indicated that the AP-RAFSR process rather than the R-AFSR process avoided the kissing bond in the bottom of the repairing interface under the condition of the tool pin length equal to the height of the standard mechanical *** continuously-distributed and large-length super-fine grain bands were eliminated in the stir zone by AP-RAFSR. The maximum tensile and compressive-shear strengths of repaired hole by AP-RAFSR reached 190.6 MPa and 138.9 MPa at 1200 rpm respectively, which were equivalent to 97.7% and 89.6% of those of the standard mechanical hole. This AP-RAFSR process assisted by the truncated cone-shaped filling material provides a new technique to obtain a no-depth-increasing, defect-free and high-strength repaired mechanical hole.

关键词： Active-passive radial-additive friction stir repairing Mechanical hole out of dimension tolerance Numerical simulation Microstructure Mechanical properties

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Design of a Dynamic Ridge Filter for Shortening Beam Delivery Time: A Simulation Study 4

Design of a Dynamic Ridge Filter for Shortening Beam Deliver...

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4th IEEE china International Youth Conference on Electrical engineering, CIYCEE 2023

作者： Yu, Benzhaoxia Liu, Xu Wang, Wei Qin, Bin Huazhong University of Science and Technology School of Electrical and Electronic Engineering State Key Laboratory of Advanced Electromagnetic Technology Wuhan430074 China

ISBN: (纸本)9798350305562

Shortening the delivery time for proton therapy can improve the treatment efficiency and efficacy. Energy layer switching time (ELST) is the main contributor to the delivery time. In this study, we design a general dynamic ridge filter (D-RiFi) to broaden the width of the pristine Bragg peak, which can significantly reduce the number of energy layers and the treatment time. By optimizing the shape of D-RiFi, the maximum width of the Bragg peak can be extended to 3.16 cm with a dose flatness of 2.3%. The placement of D-RiFi also influences the beam size and lateral dose uniformity at the isocenter. According to the result of the Monte Carlo simulation, the D-RiFi should be placed 50cm away from the isocenter to satisfy the clinical dose uniformity of 2.5%. Furthermore, the hybrid broadening of the D-RiFi is proposed to reduce the number of energy while reducing the distal falloff width (DFW). The number of energy layers can be reduced by 76.19 % from 21 to 5 with the DFW of 0.54cm, which is conducive to realizing fast proton therapy and some advanced motion-control techniques (e.g., volume repainting, real-time tumor tracking). © 2023 IEEE.

关键词： Proton beams

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