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Multi-parameter control of photodetection in van der Waals magnet CrSBr

Light(Science & Applications) 2025年第3期14卷 713-720页

作者： Shiqi Yango Zhigang Song Yuchen Gao Leyan Huang Xinyue Huang Pingfan Gu Wenjng Liu Zuxin Chen Yu Ye State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics School of PhysicsPeking UniversityBeijing 100871China John A.Paulson School of Engineering and Applied Sciences Harvard UniversityCambridgeMA02138USA Academy for Advanced Interdisciplinary Studies Peking UniversityBeijing 100871China School of Semiconductor Science and Technology South China Normal UniversityFoshan 528225China Collaborative Innovation Centre of Quantum Matter Bejing 100871China Yangtze Delta Institute of Optoelectronics Peking UniversityNantong 226010 JiangsuChina Liaoning Academy of Materials Shenyang110167China

Photodetectors equipped with multi-parameter control hold the potential to deliver exceptional performance in a wide range of scenarios,paving the way for developing novel spin-opto-electronic ***,the integration of such capabilities within a single device is challenging due to the necessity of harmonizing multiple materials with varying degrees of *** this study,we introduce the van der Waals magnet CrSBr,featuring inherent anisotropy and distinctive spin-electronic coupling,to this *** linear dichroic ratio of the photocurrent in CrSBr tunneling device can reach~60 at 1.65 K,and the photoresponse experiences a significant boost with increasing magnetic ***,the unique spin-charge coupling engenders a photon energy-dependent photocurrent that is modulated by an external field and is validated by first-principle *** findings elucidate the effective multi-parameter control of photodetection based on vdWs magnet CrsBr,highlighting its potential applications in cutting-edge optoelectronic devices and as a highly sensitive probe medium.

关键词： van der waals magnet crsbr linear dichroic ratio multi parameter control photon energy dependent photocurrent van der waals magnet crsbrfeaturing photoresponse harmonizing multiple materials photodetection

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Operator scattering theory for multilayer cylinders comprising gyrotropic materials and its application to Weyl semimetals

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Physical Review A 2025年第3期111卷 033520-033520页

作者： Michael M. Kharton Lei Gao Dongliang Gao Andrey Novitsky Belarusian State University Nezavisimosti Avenue 4 220030 Minsk Belarus School of Optical and Electronic Information Suzhou City University Suzhou 215104 China Jinagsu Key laboratory of Biophotonics & Suzhou Key Laboratory of Biophotonics & SZU-ITU International Joint Meta-center for Advanced Photonics and Electronics Suzhou City University Suzhou 215104 China School of Physical Science and Technology & Jiangsu Key Laboratory of Frontier Material Physics and Devices Soochow University Suzhou 215006 China

Weyl semimetals are prospective materials to tailor light-matter interaction due to their gyrotropic properties caused by a couple of chiral Weyl points. Here, we study electromagnetic scattering characteristics from infinitely long multilayer cylindrical particles containing Weyl semimetal layers. We develop a modification of operator scattering theory that uses evolution operators to describe a set of layers. We reveal asymmetry in differential scattering cross sections stemming from the axion term of Weyl semimetal permittivity tensor, trace the radiation pattern change for multilayer particles, analyze the interference of lower multipoles with perspective of generalizing the Kerker effect, and carry out multipolar decomposition of the scattered radiation. Both the scattering theory and the numerical results can be useful for device engineering in nanophotonics.

关键词： Multilayers

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Bioinspired Sensing of Undulatory Flow Fields Generated by Leg Kicks in Swimming

arXiv

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arXiv 2025年

作者： Wang, Jun Shen, Tongsheng Zhao, Dexin Zhang, Feitian Department of Advanced Manufacturing and Robotics The State Key Laboratory of Turbulence and Complex Systems College of Engineering Peking University Beijing100871 China The National Innovation Institute of Defense Technology Beijing China National Innovation Institute of Defense Technology Beijing100071 China

The artificial lateral line (ALL) is a bioinspired flow sensing system for underwater robots, comprising of distributed flow sensors. The ALL has been successfully applied to detect the undulatory flow fields generated by body undulation and tail-flapping of bioinspired robotic fish. However, its feasibility and performance in sensing the undulatory flow fields produced by human leg kicks during swimming has not been systematically tested and studied. This paper presents a novel sensing framework to investigate the undulatory flow field generated by swimmer’s leg kicks, leveraging bioinspired ALL sensing. To evaluate the feasibility of using the ALL system for sensing the undulatory flow fields generated by swimmer leg kicks, this paper designs an experimental platform integrating an ALL system and a lab-fabricated human leg model. To enhance the accuracy of flow sensing, this paper proposes a feature extraction method that dynamically fuses time-domain and time-frequency characteristics. Specifically, time-domain features are extracted using one-dimensional convolutional neural networks and bidirectional long short-term memory networks (1DCNN-BiLSTM), while time-frequency features are extracted using short-term Fourier transform and two-dimensional convolutional neural networks (STFT-2DCNN). These features are then dynamically fused based on attention mechanisms to achieve accurate sensing of the undulatory flow field. Furthermore, extensive experiments are conducted to test various scenarios inspired by human swimming, such as leg kick pattern recognition and kicking leg localization, achieving satisfactory results. Copyright © 2025, The Authors. All rights reserved.

关键词： Convolutional neural networks

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3DBench: A scalable benchmark for object and scene-level instruction-tuning of 3D large language models

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Neural Networks 2025年 189卷 107566页

作者： Hu, Tianci Zhang, Junjie Rao, Yutao Zeng, Dan Yu, Hongwen Huang, Xiaoshui Key Laboratory of Specialty Fiber Optics and Optical Access Networks Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication Shanghai Institute of Advanced Communication and Data Science Shanghai University Shanghai200400 China School of Advanced Technology Xi'an Jiaotong-Liverpool University Jiangsu Province 215123 China School of Public Health Shanghai Jiao Tong University Shanghai200127 China

Recent assessments of Multi-Modal Large Language Models (MLLMs) have been thorough. However, a detailed benchmark that integrates point cloud data with language for MLLMs remains absent, leading to superficial comparisons that obscure advancements in the nuanced capabilities of such models. Current benchmarks typically feature object-level classification, scene-level captioning, and visual grounding (VG) tasks. These tasks inadequately encapsulate the spatial perception and logical reasoning skills of MLLMs, nor do they permit a just and all-encompassing assessment of MLLMs with varied architectures. To address these gaps, we propose 3DBench, a novel fine-grained benchmark specifically designed for MLLMs. It encompasses ten tasks spanning object and scene levels and organizes these tasks into three evaluative categories: expression, perception, and reasoning. Additionally, we present a scalable approach for constructing 3D instruction-tuning datasets derived from simulation environments, resulting in a dataset with over 239k question–answer pairs covering twelve tasks and their respective point clouds. Using this high-quality dataset, we introduce the Bench-model, which integrates advanced detection models to significantly enhance MLLM performance. We compare Bench-model against open-sourced 3D LLMs, analyzing the impact of different model architectures, training protocols, and public datasets. These experimental outcomes provide crucial perspectives on existing research limitations and suggest potential rooms for future investigation. Codes and datasets are available at https://***/Inshsang/3DBench. © 2025 Elsevier Ltd

关键词： Evaluation metrics Fine-grained tasks Instruction-tuning datasets Multi-modal large language models Point clouds

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An Efficient Boron Source Activation Strategy for the Low‑Temperature Synthesis of Boron Nitride Nanotubes

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Nano-Micro Letters 2025年第1期17卷 548-558页

作者： Ying Wang Kai Zhang Liping Ding Liyun Wu Songfeng E Qian He Nanyang Wang Hui Zuo Zhengyang Zhou Feng Ding Yue Hu Jin Zhang Yagang Yao National Laboratory of Solid State Microstructures College of Engineering and Applied SciencesJiangsu Key Laboratory of Artificial Functional Materialsand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093People’s Republic of China School of Electronic Information and Artificial Intelligence Shaanxi University of Science&TechnologyXian 710000People’s Republic of China College of Bioresources Chemical and Materials Engineering Shaanxi University of Science&TechnologyXian 710000People’s Republic of China Key Laboratory of Carbon Materials of Zhejiang Province College of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325000People’s Republic of China Shenzhen Institutes of Advanced Technology Chinese Academy of SciencesShenzhen 518000People’s Republic of China College of Chemical and Molecular Engineering Peking UniversityBeijing 100871People’s Republic of China

Lowering the synthesis temperature of boron nitride nanotubes(BNNTs)is crucial for their *** primary reason for adopting a high temperature is to enable the effective activation of highmelting-point solid *** this study,we developed a novel approach for efficiently activating boron by introducing alkali metal compounds into the conventional MgO–B *** approach can be adopted to form various low-melting-point AM–Mg–B–O growth *** growth systems have improved catalytic capability and reactivity even under low-temperature conditions,facilitating the synthesis of BNNTs at temperatures as low as 850℃.In addition,molecular dynamics simulations based on density functional theory theoretically demonstrate that the systems maintain a liquid state at low temperatures and interact with N atoms to form BN *** findings offer novel insights into the design of boron activation and are expected to facilitate research on the low-temperature synthesis of BNNTs.

关键词： Boron nitride nanotubes Low-temperature Boron activation Density functional theory

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Conducting metallic metameshes with perfect electromagnetic transparency for arbitrary polarization and angle of incidence

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Physical Review Applied 2025年第2期23卷 024025-024025页

作者： Hao Luo Jie Luo HongChen Chu WenJie Ji Yun Lai National Laboratory of Solid State Microstructures School of Physics Collaborative Innovation Center of Advanced Microstructures and Jiangsu Physical Science Research Center Nanjing University Nanjing 210093 China School of Physical Science and Technology & Jiangsu Key Laboratory of Frontier Material Physics and Devices Soochow University Suzhou 215006 China School of Physics and Technology Nanjing Normal University Nanjing 210023 China School of Optical and Electronic Information Suzhou City University Suzhou 215104 China

Metallic meshes have long demonstrated outstanding electromagnetic shielding capabilities against low-frequency electromagnetic waves, facilitating vital applications like Faraday cages. Here, we demonstrate a metallic metamesh with tailored metallic patterns that is conducting like normal metallic meshes, but also exhibits remarkable perfect transparency for arbitrary electromagnetic waves at the working frequency. Based on special resonances introduced by the designed composite structures, such metameshes have achieved omnidirectional impedance matching with free space, regardless of the polarization and incident angle. This property enables near-100% transmission through the metamesh, with unchanged wave front. This transition from electromagnetic shielding to perfect transparency has been validated through both numerical simulations and microwave experiments. Our work paves the way towards realizing metastructures that are both conducting and transparent to electromagnetic waves, opening possibilities in radomes and wireless communications.

关键词： Wavefronts

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Influence of colloidal silica properties on chemical mechanical polishing of zirconia ceramics

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Ceramics International 2025年

作者： Lin, Wenkun Qi, Yongchi Zhang, Xueju Gu, Yunyun Wang, Yue Qian, Hongwei Luo, Hui Chen, Jiapeng Research Center for Advanced Micro-/Nano- Fabrication Materials School of Chemistry and Chemical Engineering Shanghai University of Engineering Science Shanghai201620 China School of Electro-Mechanical Engineering Zhongyuan Institute of Science and Technology Xuchang461000 China Jiangsu Key Laboratory of Precision and Micro-Manufacturing Technology National Key Laboratory of Science and Technology on Helicopter Transmission College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and Astronautics Nanjing210016 China State Key Laboratory of Silicon and Advanced Semiconductor Materials Zhejiang University Hangzhou310027 China State Key Laboratory for High Performance Tools Zhengzhou Research Institute for Abrasives & Grinding Co. Ltd Henan 450001 China

Zirconia ceramics (ZrO2) have a wide range of applications in many fields due to their many advantages such as high hardness, corrosion resistance, high dielectric constant, no signal shielding, and excellent biocompatibility. Currently, colloidal silica (SiO2) is widely employed in the chemical mechanical polishing (CMP) of ZrO2 wafers in industrial applications. While extensive research has been conducted on the effects of colloidal silica's mechanical properties on ZrO2 polishing, relatively little attention has been given to the adsorption properties of the SiO2 surface. Furthermore, the influence of the acidity (Si-OH groups) and surface adsorption characteristics of ZrO2 on the CMP removal mechanism remains underexplored. Therefore, in this paper, three alkaline molecular probes are introduced to investigate the acidity and surface adsorption properties of colloidal silica, and the interfacial reaction and material removal mechanism of colloidal silica on ZrO2 polishing are characterized and analyzed by contact angle test, X-ray photoelectron spectroscopy (XPS) and low-field nuclear magnetic resonance (LF-NMR). The results show that there are two reaction mechanisms for chemical mechanical polishing material removal rate (MRR) of ZrO2. Under acidic polishing conditions, there is no significant correlation between MRR and the acidity of Si-OH groups on the surface of the colloidal silica, and MRR is closely related to the erosion of Zr-OH on the surface of ZrO2 by Si-OH groups, which undergoes a dehydration condensation reaction. However, under alkaline polishing conditions, deprotonated Si-O-groups play a dominant role in the polishing activity and are accompanied by the generation and removal of reaction products (zirconium silicates). The optimal polishing efficiency in an acidic polishing environment, particularly when zirconia reaches its isoelectric point at pH = 6, may be attributed to the enhanced chemical reactivity between the ZrO2 and SiO2 surfaces a

关键词： Corrosion resistance

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Two-dimension high efficiency beam steering based on liquid crystal polarization gratings

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Optics Express 2025年第10期33卷 21425-21440页

作者： Li, Zifan Yu, Bijun Gong, Junhao Liu, Yutong Fan, Lina Gao, Xin Yin, Jiahang Ding, Tongshan Zhang, Dawei Wang, Jun Hong, Ruijin Mao, Hongmin Lu, Huanjun Cao, Zhaoliang Key Laboratory of Intelligent Optoelectronic Devices and Chips of Jiangsu Higher Education Institutions School of Physical Science and Technology Suzhou University of Science and Technology Suzhou215009 China Advanced Technology Research Institute of Taihu Photon Center School of Physical Science and Technology Suzhou University of Science and Technology Suzhou215009 China School of Optoelectronic Information and Computer Engineering University of Shanghai for Science and Technology Shanghai200093 China School of Electronics and Information Engineering Suzhou University of Science and Technology Jiangsu Suzhou215009 China

Cascaded liquid crystal polarization grating (LCPG) structure is commonly used to realize two-dimension large angle optical beam steering. In this architecture, different LCPGs have different incident angles. As a liquid crystal half-wave plate (LC HWP) is placed in front of the LCPG to control steering direction, the different incident angles will affect the phase modulation of LC HWP and then, decrease the steering efficiency. In this paper, the steering efficiency of cascaded LCPGs under tilt incidence is considered and a compensation method is proposed to increase the steering efficiency. A simple analysis model is established to calculate the steering efficiency of cascaded LCPG structure for tilt incidence with arbitrary direction. Further, the effect of tilt incidence on the phase modulation of LC HWP is compensated and a simple formula is given to compute the compensation voltage. A validation experiment is performed to verify the proposed method. All the simulated and experimental results indicate that the steering efficiency of cascaded LCPGs can be improved for two-dimension beam scanning. This work is helpful for high efficiency beam steering based on cascaded LCPGs. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Bragg gratings

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High-Q tunable orbital angular momentum radiation

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Optics Express 2025年第11期33卷 23883-23892页

作者： Yunqiao Yin Ye Zhang Xiaofeng Xu Lei Gao School of Physical Science and Technology Soochow University Suzhou 215006 China & Collaborative Innovation Center of Suzhou Nano Science and Technology & Jiangsu Key Laboratory of Frontier Materia Physics and Devices Soochow University Suzhou 215006 China School of Optical and Electronic Information Suzhou City University Suzhou 215104 China Jinagsu Key laboratory of Biophotonics & Suzhou Key Laboratory of Biophotonics & SZCU-ITU Joint International MetaCenter for Advanced Photonics and Electronics Suzhou City University Suzhou 215104 China

Lasers and light emitters typically do not radiate fields with orbital angular momentum (OAM). So far, the generation of single photons carrying OAM mainly relies on nonlinear processes in bulk crystals, which limits the scalability and efficiency of the source. To facilitate the realization of highly efficient OAM single-photon sources, we demonstrate a microresonator vortex emitter producing high- Q OAM vortex beams with the ability to precisely define the topological charge of the OAM mode. The phenomenon relies on the application of periodic perturbations on the nanobars, which generate a series of resonance modes in continuous guided spectra. Future developments of integrated quantum photonic devices with OAM single-photon sources may enable high-dimensional quantum information processing.

关键词： Laser light Microcavities Phase matching Photonic devices Spiral phase Waveguide modes

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Differentially Private Opinion Dynamics of Influence Networks

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IEEE Transactions on Control of Network Systems 2025年

作者： Wu, Guanglei Zhang, Wenbing Mao, Shuai Wu, Xiaotai Tang, Yang Yangzhou University School of Mathematical Sciences Jiangsu225002 China Nantong University Department of Electrical Engineering Nantong226019 China Anhui Polytechnic University Key Laboratory of Advanced Perception and Intelligent Control of High-end Equipment Ministry of Education Wuhu241000 China East China University of Science and Technology Key Laboratory of Advanced Control and Optimization for Chemical Processes Ministry of Education Shanghai200237 China

In this paper, a unified influence networks model incorporating differential privacy mechanisms (DPMs), called the differentially private opinion dynamics (DPODs) model is proposed. In this model, each individual uses protected opinions rather than the private opinions of his/her neighbors to update his/her private opinions, where the protected opinion of an individual is a blend of private opinions and random noise following Laplace distribution. Building on stochastic analysis techniques and matrix theory, we show that the influence network under consideration converges under specific conditions governing individual sensitivities and interaction weights. In addition, the statistical properties related to convergence accuracy are established by utilizing the Markov inequality to estimate a lower bound on the probability of all individuals' final opinions converging to a neighborhood formed by their initial opinions' convex hull. We further conduct a differential privacy analysis to validate the efficacy of the proposed DPMs in safeguarding the private opinions of all individuals. Finally, two examples including one of the Karate-Club networks are provided to shed new light on the effectiveness of the theoretical results. © 2014 IEEE.

关键词： Differential privacy

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