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Continuous-wave operation of 1550 nm low-threshold triple-lattice photonic-crystal surface-emitting lasers

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Light(Science & Applications) 2024年第3期13卷 446-453页

作者： Ziye Wang Xia Liu Pinyao Wang Huanyu Lu Bo Meng Wei Zhang Lijie Wang Yanjing Wang Cunzhu Tong State Key Laboratory of Luminescence and Applications Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Central Research Institute Planning Dept 2012 LabsHuawei Technologies Company Ltd.Shenzhen 518129China

Benefitting from narrow beam divergence,photonic crystal surface-emitting lasers are expected to play an essential role in the ever-growing fields of optical communication and light detection and *** operating with 1.55μm wavelengths have attracted particular attention due to their minimum fiber loss and high eye-safe ***,high interband absorption significantly decreases their performance at this 1.55μm ***,stronger optical feedback is needed to reduce their threshold and thus improve the output *** this goal,photonic-crystal resonators with deep holes and high dielectric contrast are often ***,the relevant techniques for high-contrast photonic crystals inevitably complicate fabrication and reduce the final *** this paper,we demonstrate the first continuous-wave operation of 1.55μm photonic-crystal surface-emitting lasers by using a‘triple-lattice photonic-crystal resonator’,which superimposes three lattice point groups to increase the strength of in-plane optical *** this geometry,the in-plane 180°coupling can be enhanced threefold compared to the normal single-lattice *** theoretical and experimental investigations demonstrate the much lower threshold current density of this structure compared to‘single-lattice’and‘double-lattice’photonic-crystal resonators,verifying our design *** findings provide a new strategy for photonic crystal laser miniaturization,which is crucial for realizing their use in future high-speed applications.

关键词： resonator crystal lattice

lattice distortion generates bound states in the continuum

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Science China(Physics,Mechanics & Astronomy) 2024年第3期67卷 166-166页

作者： Almas Sadreev Kirensky Institute of Physics Federal Research Center KSC Siberian BranchRussian Academy of SciencesKrasnoyarsk 660036Russia

High-Q optical cavity is an indispensable component of many photonic devices, such as lasers, sensors, harmonic generation and photon emission, and chiral *** way of realizing ultrahigh Q-factor relies on Fabry-Pérot... 详细信息

关键词： lattice distortion cavity

Charming exotics from lattice QCD

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Science China(Physics,Mechanics & Astronomy) 2024年第1期67卷 176-176页

作者： Chuan Liu School of Physics Peking UniversityBeijing 100871China

Strong interaction is believed to be described by a theory called Quantum Chromodynamics(QCD),an important sector of the Standard Model(SM)of particle *** is a strange and charming theory,just like the two names of it... 详细信息

关键词： QCD lattice theory

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基于lattice的文言文自动断句研究

计算机与数字工程 2024年第4期52卷 1137-1141,1158页

作者：庄百川于文年邱秀连武汉邮电科学研究院武汉430074 南京烽火天地通信科技有限公司南京210019

随着社会主义文化强国的建设,利用自然语言处理技术实现对古汉语典籍的处理与挖掘越发受到关注。针对文言文自动化断句任务,论文提出一种基于BERT-lattice-LAN网络的深度学习模型,通过集成预训练模型和融入词向量的长短时记忆网络,实现... 详细信息

随着社会主义文化强国的建设,利用自然语言处理技术实现对古汉语典籍的处理与挖掘越发受到关注。针对文言文自动化断句任务,论文提出一种基于BERT-lattice-LAN网络的深度学习模型,通过集成预训练模型和融入词向量的长短时记忆网络,实现对文言文语句的自动化断句处理。相比于传统的BiLSTM-CRF网络,其准确率和F值分别提高了8.03%和7.88%。

关键词：深度学习 BERT lattice 序列标注自动断句

lattice Boltzmann method for simulation of time-dependent neutral particle transport

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Nuclear Science and Techniques 2017年第3期28卷 74-84页

作者： Ya-Hui Wang Li-Ming Yan Bang-Yang Xia Yu Ma School of Energy Science and Engineering Harbin Institute of Technology Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China

In this paper, a novel model is proposed to investigate the neutron transport in scattering and absorbing medium. This solution to the linear Boltzmann equation is expanded from the idea of lattice Boltzmann method(LBM) with the collision and streaming process. The theoretical derivation of lattice Boltzmann model for transient neutron transport problem is proposed for the first *** fully implicit backward difference scheme is used to ensure the numerical stability, and relaxation time and equilibrium particle distribution function are obtained. To validate the new lattice Boltzmann model, the LBM formulation is tested for a homogenous media with different sources, and both transient and steady-state LBM results get a good agreement with the benchmark solutions.

关键词： Transient neutron transport lattice Boltzmann method Linear Boltzmann equation

lattice-Based Double-Authentication-Preventing Ring Signature for Security and Privacy in Vehicular Ad-Hoc Networks

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Tsinghua Science and Technology 2019年第5期24卷 575-584页

作者： Jinhui Liu Yong Yu Jianwei Jia Shijia Wang Peiru Fan Houzhen Wang Huanguo Zhang School of Computer Science Shaanxi Normal University. Xi'an 710119 China Department of Statistics and Actuarial Science Simon Fraser University Burnaby. V5A1S6 Canada School of Cyber Science and Engineering. Wuhan University Wuhan 430072China

Amidst the rapid development of the Internet of Things (loT), Vehicular Ad-Hoc NETwork (VANET), a typical loT application, are bringing an ever-larger number of intelligent and convenient services to the daily lives of individuals. However, there remain challenges for VANETs in preserving privacy and security. In this paper, we propose the first lattice-based Double-Authentication-Preventing Ring Signature (DAPRS) and adopt it to propose a novel privacy-preserving authentication scheme for VANETs, offering the potential for security against quantum computers. The new construction is proven secure against chosen message attacks. Our scheme is more efficient than other ring signature in terms of the time cost of the message signing phase and verification phase, and also in terms of signature length. Analyses of security and efficiency demonstrate that our proposed scheme is provably secure and efficient in the application.

关键词： Vehicular Ad-Hoc NETwork(VANET) privacy security Double-Authentication-Preventing Ring Signature(DAPRS) lattice

lattice Boltzmann method for simulating flows in open-channel with partial emergent rigid vegetation cover

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Journal of Hydrodynamics 2019年第4期31卷 717-724页

作者： Zhong-hua Yang Feng-peng Bai Wen-xin Huai Cheng-guang Li State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan University Wuhan 430072 China Changjiang Water Resources Protection Institute Wuhan 430051 China Shandong Provincial Key Laboratory of Water Resources and Water Environment Water Resources Research Institute of Shandong Province Jinan 250013 China

Flows in open-channel with partial emergent rigid vegetation cover are simulated using the lattice Boltzmann method (LBM) described by the 2-D nonlinear shallow water equations. The effect of vegetation is represented with the vegetation roughness coefficient, which is related to the vegetation density, diameter of the vegetation elements and drag coefficient. The model is verified by three numerical tests: flow in a 180° curved open channel with partial vegetation cover at the outer bank, flow in a rectangular channel with a finite patch of vegetation and flow in a rectangular channel with a vegetated bank. Numerical results are compared with the experimental data, and the good agreement proved that the presented model can model the vegetated channel flows correctly.

关键词： Open-channel flow rigid vegetation lattice Boltzmann method (LBM) shallow water equations vegetation roughness coefficient

lattice Boltzmann Model for Compressible Fluid on a Square lattice

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Chinese Physics Letters 2000年第10期17卷 743-745页

作者： SUN Cheng-Hai State Key Laboratory of Tribology Department of Engineering MechanicsTsinghua UniversityBeijing 100084

A two-level four-direction lattice Boltzmann model is formulated on a square lattice to simulate compressible flows with a high Mach number. The particle velocities are adaptive to the mean velocity and internal energy. Therefore, the mean flow can have a high Mach number. Due to the simple form of the equilibrium distribution, the 4th order velocity tensors are not involved in the calculations. Unlike the standard lattice Boltzmann model, o special treatment is need for the homogeneity of 4th order velocity tensors on square lattices. The Navier-Stokes equations were derived by the Chapman-Enskog method from the BGK Boltzmann equation. The model can be easily extended to three-dimensional cubic lattices. Two-dimensional shock-wave propagation was simulated.

关键词： equation. energy. lattice

lattice Thermal Conductivity of MgSiO_(3) Perovskite and Post-Perovskite under Lower Mantle Conditions Calculated by Deep Potential Molecular Dynamics

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Chinese Physics Letters 2022年第11期39卷 42-47页

作者： Fenghu Yang Qiyu Zeng Bo Chen Dongdong Kang Shen Zhang Jianhua Wu Xiaoxiang Yu Jiayu Dai Department of Physics National University of Defense TechnologyChangsha 410003China

lattice thermal conductivity(κlat)of MgSiO_(3) perovskite and post-perovskite is an important parameter for the thermal dynamics in the ***,we develop a deep potential of density functional theory quality under entire thermodynamic conditions in the lower mantle,and calculate theκlatby the Green-Kubo *** potential molecular dynamics captures full-order anharmonicity and considers ill-defined phonons in low-κlatmaterials ignored in the phonon gas ***κlatshows negative temperature dependence and positive linear pressure ***,theκlatundergos an increase at the phase boundary from perovskite to *** demonstrate that,along the geotherm,theκlatincreases by 18.2% at the phase *** results would be helpful for evaluating Earth’s thermal dynamics and improving the Earth model.

关键词： lattice perovskite Deep