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Reversely tailoring antiresonant hollow-core fibers with elliptical-shaped tubes for enhanced in-line bandpass filters

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Optics Express 2025年第12期33卷 26641-26650页

作者： Jie Zhu Yu Qin Cong Xiong Wei Ji Caoyuan Wang Jonas H Osório Wei Jiang Yichun Shen Limin Xiao Advanced Fiber Devices and Systems Group Key Laboratory of Micro and Nano Photonic Structures (MoE) Key Laboratory for Information Science of Electromagnetic Waves (MoE) Shanghai Engineering Research Center of Ultra-Precision Optical Manufacturing School of Information Science and Technology Fudan University Shanghai 200433 China Zhongtian Technology Advanced Materials Co. Ltd. Nantong Jiangsu 226009 China Multiuser Laboratory of Optics and Photonics (LaMOF) Department of Physics Federal University of Lavras Lavras 37203-202 Brazil Heraeus (China) Investment Co. Ltd. Shanghai China

We report a simple and effective approach to reversely tailoring the tubes of an antiresonant hollow-core fiber (AR-HCF). The AR-HCFs with elliptical-shaped shrinkage tubes, implemented by a traditional flame brushing technique, were characterized for what we believe to be the first time. We have thus achieved a 70 nm wide bandpass filter with a minimum extra loss below 0.1 dB and the out-of-band suppression up to 28 dB in the 800 nm wide spectral range via the combination of down-tapering and reverse-tapering of AR-HCFs. The elliptical-shaped tubes can reduce the deformation-induced confinement loss when tailoring the thickness of HCF. The ability to tailor the shape and thickness of tubes of AR-HCF in a submicron-scale using a traditional flame taper rig will benefit the fabrication of in-fiber HCF devices such as the low-loss HCF bandpass filter with high out-of-band suppression.

关键词： Acoustooptic modulators Bandpass filters Fiber tapers Fresnel reflection Optical fibers Polarizers

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Molecular dynamics simulations of heat transport using machine-learned potentials: A mini review and tutorial on GPUMD with neuroevolution potentials

arXiv

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arXiv 2024年

作者： Dong, Haikuan Shi, Yongbo Ying, Penghua Xu, Ke Liang, Ting Wang, Yanzhou Zeng, Zezhu Wu, Xin Zhou, Wenjiang Xiong, Shiyun Chen, Shunda Fan, Zheyong College of Physical Science and Technology Bohai University Jinzhou China Department of Physical Chemistry School of Chemistry Tel Aviv University Tel Aviv6997801 Israel Department of Electronic Engineering and Materials Science and Technology Research Center The Chinese University of Hong Kong N.T. Shatin999077 Hong Kong MSP group QTF Centre of Excellence Department of Applied Physics Aalto University Aalto EspooFI-00076 Finland The Institute of Science and Technology Austria Am Campus 1 Klosterneuburg3400 Austria Department of Engineering Mechanics School of Civil Engineering and Transportation South China University of Technology Guangdong Province Guangzhou510640 China Department of Energy and Resources Engineering Peking University Beijing100871 China School of Advanced Engineering Great Bay University Dongguan523000 China Guangzhou Key Laboratory of Low-Dimensional Materials and Energy Storage Devices School of Materials and Energy Guangdong University of Technology Guangzhou510006 China Department of Civil and Environmental Engineering George Washington University WashingtonDC20052 United States

Molecular dynamics (MD) simulations play an important role in understanding and engineering heat transport properties of complex materials. An essential requirement for reliably predicting heat transport properties is the use of accurate and efficient interatomic potentials. Recently, machine-learned potentials (MLPs) have shown great promise in providing the required accuracy for a broad range of materials. In this mini review and tutorial, we delve into the fundamentals of heat transport, explore pertinent MD simulation methods, and survey the applications of MLPs in MD simulations of heat transport. Furthermore, we provide a step-by-step tutorial on developing MLPs for highly efficient and predictive heat transport simulations, utilizing the neuroevolution potentials (NEPs) as implemented in the GPUMD package. Our aim with this mini review and tutorial is to empower researchers with valuable insights into cutting-edge methodologies that can significantly enhance the accuracy and efficiency of MD simulations for heat transport studies. Copyright © 2024, The Authors. All rights reserved.

关键词： Molecular dynamics

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Fabrication of Multi-Layer Radar Absorbing Structures Based on Continuous Fiber 3d Printing and Thickness Correction Method

SSRN

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SSRN 2023年

作者： Lee, Jung-Ryul Jin, Do-Hyeon Hyun, Jong-Min Ahn, Joon-Mo Department of Aerospace Engineering Korea Advanced Institute of Science and Technology 291 Daehak-ro Yuseong-gu Daejeon34141 Korea Republic of Materials & Energy Technology Center Agency for Defense Development Yuseong P.O. Box 35 Daejeon34186 Korea Republic of

Three-dimensional (3D) printing technology has revolutionized the fabrication of complex geometries, including electromagnetic wave absorbers. In this study, the multilayer radar absorbing structure (RAS) was designed and fabricated using a continuous fiber 3D printing process based on material extrusion (ME). However, thickness errors during the printing process resulted in significant deviations in the electromagnetic wave absorption performance. To address this issue, the thickness correction method based on unit thickness was proposed. The unit thickness, which is the basic thickness of the multilayer RAS, was calculated to account for the thickness increase during printing. The redesigned RAS based on the calculated unit thickness effectively corrected the thickness error. The total thickness and thickness of each layer of the corrected RAS were measured and found to be similar to the design value. The measured electromagnetic wave absorption performance closely matched the analyzed value, confirming the effectiveness of the unit thickness-based correction method in improving the ME-based 3D printing process for fabricating RAS. © 2023, The Authors. All rights reserved.

关键词： 3D printing

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Multimodal channel cancer chemotherapy by 2D functional gadolinium metal–organic framework

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National science Review 2021年第7期8卷 175-184页

作者： Jiale Xia Yumeng Xue Bo Lei Lingling Xu Mingzi Sun Na Li Hongyang Zhao Min Wang Meng Luo Chao Zhang Bolong Huang Yaping Du Chun-Hua Yan Frontier Institute of Science and Technology Xi'an Jiaotong University Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic University Tianjin Key Lab for Rare Earth Materials and Applications School of Materials Science and Engineering National Institute for Advanced Materials Center for Rare Earth and Inorganic Functional Materials Nankai University Beijing National Laboratory for Molecular Sciences State Key Laboratory of Rare Earth Materials Chemistry and Applications PKU–HKU Joint Laboratory in Rare Earth Materials and Bioinorganic Chemistry College of Chemistry and Molecular Engineering Peking University College of Chemistry and Chemical Engineering Lanzhou University

2 D nanomaterials generally exhibit enhanced physiochemical and biological functions in biomedical applications due to their high surface-to-volume ratio and surface charge. Conventional cancer chemotherapy based on nanomaterials has been hindered by their low drug loading and poor penetration in tumor tissue. To overcome these difficulties, novel materials systems are urgently needed. Hereby, the lanthanide-based porphyrin metal–organic framework(MOF) nanosheets(NSs) with promising cancer imaging/chemotherapy capacities are fabricated, which display superior performance in the drug loading and tumor tissue penetration. The biodegradable PPF-Gd NSs deliver an ultrahigh drug loading(>1500%)and demonstrate the stable and highly sensitive stimuli-responsive degradation/release for multimodal tumor imaging and cancer chemotherapy. Meanwhile, PPF-Gd NSs also exhibit excellent fluorescence and magnetic resonance imaging capability in vitro and in vivo. Compared to the traditional doxorubicin(DOX)chemotherapy, the in vivo results confirm the evident suppression of the tumor growth by the PPF-Gd/DOX drug delivery system with negligible side effects. This work further supports the potential of lanthanide-based MOF nanomaterials as biodegradable systems to promote the cancer theranostics technology development in the future.

关键词： lanthanide-based porphyrin metal–organic framework drug delivery stimuli-responsive degradation/release tumor tissue penetration cancer chemotherapy

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Effect of P and B Compound Strengthening on the Evolution of Phases and Stress Rupture Properties of the In718 Superalloy During Long-Term Aging at 650 ℃

SSRN

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SSRN 2023年

作者： Wang, Zhiyuan Zhang, Weiwei Li, Shaowei Mei, Feiqiang Xin, Xin Sun, Wenru School of Materials Science and Engineering University of Science and Technology of China Shenyang110016 China Institute of Metal Research Chinese Academy of Sciences Shenyang110016 China Chengdu Advanced Metal Materials Industry Technology Research Institute Co. Ltd. Sichuan Chengdu610303 China Shenyang Area 2nd Military Representative Room of Air Force Equipment Department Shenyang110043 China

The influences of P and B compound strengthening on the precipitated phases, stress-rupture properties and deformation mechanisms of a direct-aged IN718 superalloy during long-term aging at 650 ℃ are investigated. The results indicate that the combined addition of P and B reduces the coarsening rate of γ″ phases and markedly inhibits the precipitation and growth of δ phases and α-Cr phases. P and B compound strengthening could improve the stress-rupture property of the alloy at 680 ℃/700 MPa by increasing the strength of intragranular and grain boundary. In the grain interior, P and B compound strengthening could inhibit the intragranular diffusion and hinder the coarsening of γ″ phases, thus increasing the stability of γ″ phases that could reduce the degree of cut by dislocations. In addition, the combined addition of P and B reduces the stacking fault energy of the alloy and forms the high-density twin, improving the ability of the alloy to impede dislocation movement. At the grain boundary, P and B compound strengthening could inhibit the grain boundary diffusion, hindering the nucleation and growth of the δ phase and the α-Cr phase, and the crack initiation and propagation. After aging at 650 ℃ for 5000 h, the combined addition of P and B could also inhibit the precipitation of TCP-σ phases at grain boundaries, but the TCP phases have no obvious effect on the stress-rupture property of the alloys due to their lower amounts and sizes. With the increase in aging time, the permanent deformation mechanism of the two alloys changes from twinning to dislocation shear γ" phase and twinning. © 2023, The Authors. All rights reserved.

关键词： Grain boundaries

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Comprehensive Theoretical Quantification of Secondary Electron Emission from Silicon

SSRN

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SSRN 2023年

作者： Khan, Muhammad Saadat Shakoor Mao, Shifeng Zou, Yanbo Lu, Dabao Da, Bo Li, Yonggang Ding, Zejun Department of Physics University of Science and Technology of China Anhui Hefei230026 China Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of China Anhui Hefei230026 China Department of Nuclear Science and Engineering University of Science and Technology of China Anhui Hefei230026 China School of Physics and Electronic Engineering Xinjiang Normal University Xinjiang Urumchi830054 China Microscope Science and Technology Limited Anhui Hefei230093 China Research and Services Division of Materials Data and Integrated System National Institute for Materials Science 1-1 Namiki Ibaraki Tsukuba305-0044 Japan Research Center for Advanced Measurement and Characterization National Institute for Materials Science 1-2-1 Sengen Ibaraki Tsukuba305-0047 Japan Key Laboratory of Materials Physics Insititute of Solid State Physics Chinese Academy of Sciences Anhui Hefei230031 China

Though intensive experimental studies have been carried out on electron emission properties in past decades, the reliable data from accurate experimental measurements for clean and smooth surfaces are still quite limited. In this work, we have performed a comprehensive Monte Carlo simulation of electron emission yields, the secondary electron yield (SEY,δ), backscattered electron coefficient (BSC,η) and total electron yield (TEY,σ=δ+η), from silicon and the uncertainty quantification of the theoretical calculation results for the first time. The considered uncertainty factors in the physical modelling include work function data, optical energy loss function data, dielectric function models for electron inelastic scattering and the scattering potentials for electron elastic scattering. The calculation results show that δ is significantly influenced by the work function while the dielectric function model has a slight effect. Elastic scattering potential and energy loss function affects both δ and η. Our simulatedσ η data agree with most of the experimental measurements while the simulated mean σ data are well below most of the experimental data. The experimental σ data measured by Goto lie within the uncertainty range of our simulation results. This work has provided sufficient ground for the necessity of building a theoretical database of electron emission yield. © 2023, The Authors. All rights reserved.

关键词： Silicon

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Enhancement of magnetic properties of hot pressed/die-upset Dy-free Nd-Fe-B magnets with Cu/Nd coating by wet process

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Rare Metals 2020年第1期39卷 48-54页

作者： Jeehye Kwon Dajeong Lee Dayoung Yoo Seongkyu Park Hee-Ryoung Cha Hae-Woong Kwon Junggoo Lee Dongyun Lee Department of Advanced Circuit Interconnection Pusan National UniversityBusan46241Republic of Korea Department of Nano Fusion Technology Pusan National UniversityBusan46241Republic of Korea Powder and Ceramics Department Korea Institute of Machinery and MaterialsChangwon51508Republic of Korea Department of Materials Science and Engineering Pukyong National UniversityBusan48513Republic of Korea Department of Nanoenergy Engineering Pusan National UniversityBusan46241Republic of Korea

A grain boundary diffusion process(GBDP)was adopted to improve magnetic properties of Dy-free highly coercive Nd-Fe-B permanent magnet by coating thin layers of Nd and Cu in grain *** GBDP of Nd and Cu,Nd and Cu were coated by wet process,e.g.,electrochemical and electroless on Nd-Fe-B magnets,which was fabricated by hot-deformed/die-upset with meltspun *** treatment was performed for 20 min at 600℃followed by several different cooling *** cooling conditions after heat treatment were varied to understand distribution and micros tructural effects of Nd and Cu species in grain *** coercivity increased from 1.565 to 1.637 T in oil cooling rate but remanence decreased,while remanence jumped with little decrease in coercivity in furnace *** tructure analyses suggested that the coercivity was closely related to the cooling rate as well as distribution of *** mechanism of coercivity enhancement due to the cooling rate was discussed based on the results presented here and those in the literature.

关键词： Magnetic materials Electrochemical deposition Diffusion Scanning electron microscopy Coercivity

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Rational design on high-performance triboelectric nanogenerator consisting of silicon carbide@silicon dioxide nanowhiskers/polydimethylsiloxane (SiC@SiO2/PDMS) nanocomposite films

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Discover Nano 2023年第1期18卷 69-69页

作者： Zhao, Kun Sun, Wanru Li, Suixin Song, Zhenhua Zhong, Ming Zhang, Ding Gu, Bing-Ni Liu, Ming-Jin Fu, Hao Liu, Hongjie Meng, Cheng Chueh, Yu-Lun State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of Technology Lanzhou730050 China School of Materials Science and Engineering National Institute for Advanced Materials Nankai University Tianjin300350 China Department of Materials Science and Engineering National Tsing Hua University Hsinchu30013 Taiwan School of Chemistry and Chemical Engineering Guangxi University Nanning530004 China Colleage of Semiconductor Research National Tsing-Hua University Hsinchu30013 Taiwan Department of Physics National Sun Yat-Sen University Kaohsiung80424 Taiwan Frontier Research Center on Fundamental and Applied Sciences of Matters National Tsing Hua University Hsinchu30013 Taiwan Jiangxi Province Key Laboratory of Polymer Micro/Nano Manufacturing and Devices School of Chemistry Biology and Materials Science East China University of Technology Nanchang330013 China

The relatively low output performance of triboelectric nanogenerator (TENG), which faces a challenge in performance improvement, limits its practical applications. Here, a high-performance TENG consisting of a silicon carbide@silicon dioxide nanowhiskers/polydimethylsiloxane (SiC@SiO2/PDMS) nanocomposite film and a superhydrophobic aluminum (Al) plate as triboelectric layers is demonstrated. The 7 wt% SiC@SiO2/PDMS TENG presents a peak voltage of 200 V and a peak current of 30 μA, which are ~ 300 and ~ 500% over that of the PDMS TENG, owing to an increase in dielectric constant and a decrease in dielectric loss of the PDMS film because of electric insulated SiC@SiO2 nanowhiskers. Furthermore, a 10 μF capacitor can be charged up to 3 V within ~ 87 s, which can be continuously operated on the electronic watch for 14 s. The work provides an effective strategy for improving output performance of TENG by adding core–shell nanowhiskers to modulate the dielectric properties of organic materials. Graphical abstract: [Figure not available: see fulltext.] © 2023, The Author(s).

关键词： Silica

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Annealing-induced evolution of boron-doped polycrystalline diamond

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Physical Review materials 2024年第4期8卷 044802-044802页

作者： Gufei Zhang Ramiz Zulkharnay Fabian Ganss Yujie Guo Mohammed Alkhalifah Limin Yang Sen Zhang Shengqiang Zhou Peng Li Yejun Li Victor V. Moshchalkov Jiaqi Zhu Paul W. May National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology 150080 Harbin China Zhengzhou Research Institute Harbin Institute of Technology 450000 Zhengzhou China POLIMA—Center for Polariton-Driven Light-Matter Interactions and Danish Institute for Advanced Study University of Southern Denmark Campusvej 55 DK-5230 Odense M Denmark School of Chemistry University of Bristol Bristol BS8 1TS United Kingdom Institute of Ion Beam Physics and Materials Research Helmholtz-Zentrum Dresden-Rossendorf Bautzner Landstraße 400 01328 Dresden Germany Photonics Research Group Department of Information Technology Ghent University-IMEC 9052 Ghent Belgium Department of Chemical Engineering Shandong University of Technology 255000 Zibo China Hunan Key Laboratory of Nanophotonics and Devices School of Physics and Electronics and School of Materials Science and Engineering Central South University 410083 Changsha China Department of Physics and Astronomy KU Leuven B-3001 Heverlee Belgium

Diamond shows great promise for opening up new paradigms in the semiconductor industry and quantum electronics. Here, we investigate the influence of thermal annealing on the structural and electrical transport properties of heavily boron-doped polycrystalline diamond (BPD) thin films. Our structural analyses show that annealing beyond 600∘C can induce severe local amorphization in a BPD thin film and transform it into a binary mixture of spatially separate domains of amorphous carbon (a-C) and diamond grains. Due to this annealing-induced morphology and phase segregation, the BPD thin films demonstrate a significant decrease of the electron localization radius and a distinct increase of the Ginzburg-Landau coherence length. Our research provides physical insight into the conversion of diamond to a-C and aids in defining the application scope of BPD by revealing its heat tolerance.

关键词： Electrical properties Localization Phase transitions Polycrystals Structural properties Amorphous materials Diamond Doped semiconductors Granular solids Low-temperature superconductors Semiconductors Superconductors Annealing Chemical vapor deposition Raman spectroscopy

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Variational Quantum Imaginary Time Evolution for Matrix Product State Ansatz with Tests on Transcorrelated Hamiltonians

arXiv

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arXiv 2024年

作者： Li, Hao-En Li, Xiang Huang, Jia-Cheng Zhang, Guang-Ze Shen, Zhu-Ping Zhao, Chen Li, Jun Hu, Han-Shi Department of Chemistry and Engineering Research Center of Advanced Rare-Earth Materials of Ministry of Education Tsinghua University Beijing100084 China Department of Chemistry Guangdong Provincial Key Laboratory of Catalytic Chemistry Southern University of Science and Technology Shenzhen518055 China Fundamental Science Center of Rare Earths Ganjiang Innovation Academy Chinese Academy of Sciences Ganzhou341000 China

The matrix product state (MPS) ansatz offers a promising approach for finding the ground state of molecular Hamiltonians and solving quantum chemistry problems. Building on this concept, the proposed technique of quantum circuit MPS (QCMPS) enables the simulation of chemical systems using a relatively small number of qubits. In this study, we enhance the optimization performance of the QCMPS ansatz by employing the variational quantum imaginary time evolution (VarQITE) approach. Guided by McLachlan’s variational principle, the VarQITE method provides analytical metrics and gradients, resulting in improved convergence efficiency and robustness of the QCMPS. We validate these improvements numerically through simulations of H2, H4, and LiH molecules. Additionally, given that VarQITE is applicable to non-Hermitian Hamiltonians, we evaluate its effectiveness in preparing the ground state of transcorrelated (TC) Hamiltonians. This approach yields energy estimates comparable to the complete basis set (CBS) limit while using even fewer qubits. Specifically, we perform simulations of the beryllium atom and LiH molecule using only three qubits, maintaining high fidelity with the CBS ground state energy of these systems. This qubit reduction is achieved through the combined advantages of both the QCMPS ansatz and transcorrelation. Our findings demonstrate the potential practicality of this quantum chemistry algorithm on near-term quantum devices. Copyright © 2024, The Authors. All rights reserved.

关键词： Qubits

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