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Tuning exciton dynamics by the dielectric confinement effect in Quasi-two-dimensional perovskites

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Photonics Research 2024年第3期12卷 563-570页

作者： MINGHUAN CUI CHAOCHAO QIN YUANZHI JIANG SHICHEN ZHANG CHANGJIU SUN MINGJIAN YUAN YONGGANG YANG YUFANG LIU Henan Key Laboratory of Infrared Materials&Spectrum Measures and Applications Henan Normal UniversityXinxiang 453007China Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) College of ChemistryNankai UniversityTianjin 300071China Institute of Physics Henan Academy of SciencesZhengzhou 450046China

The dielectric confinement effect plays an essential role in optoelectronic devices.Existing studies on the relationship between the dielectric confinement and the photoelectric properties are inadequate.Herein,three organic spacers with different dielectric constants are employed to tune the exciton dynamics of Quasi-two-dimensional(Quasi-2D)Ruddlesden–Popper perovskite films.Femtosecond transient absorption spectroscopy reveals that the small dielectric constant ligand enables a weak dynamic disorder and a large modulation depth of the coherent phonons,resulting in a more complete energy transfer and the inhibition of a trap-mediated nonradiative recombination.Additionally,the increase in the bulk-ligand dielectric constant reduces the corresponding exciton binding energy and then suppresses the Auger recombination,which is beneficial for high-luminance lightemitting diodes.This work emphasizes the importance of dielectric confinement for regulating the exciton dynamics of layered perovskites.

关键词： dielectric perovskite Quasi

CQFFA:A Chaotic Quasi-oppositional Farmland Fertility Algorithm for Solving Engineering Optimization Problems

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Journal of Bionic Engineering 2023年第1期20卷 158-183页

作者： Farhad Soleimanian Gharehchopogh Mohammad H.Nadimi-Shahraki Saeid Barshandeh Benyamin Abdollahzadeh Hoda Zamani Department of Computer Engineering Urmia BranchIslamic Azad UniversityUrmia969Iran Faculty of Computer Engineering Najafabad BranchIslamic Azad UniversityNajafabad517Iran Big Data Research Center Najafabad BranchIslamic Azad UniversityNajafabad517Iran Afagh Higher Education Institute Urmia969Iran

Farmland Fertility Algorithm(FFA)is a recent nature-inspired metaheuristic algorithm for solving optimization problems.Nevertheless,FFA has some drawbacks:slow convergence and imbalance of diversification(exploration)and intensification(exploitation).An adaptive mechanism in every algorithm can achieve a proper balance between exploration and exploitation.The literature shows that chaotic maps are incorporated into metaheuristic algorithms to eliminate these drawbacks.Therefore,in this paper,twelve chaotic maps have been embedded into FFA to find the best numbers of prospectors to increase the exploitation of the best promising solutions.Furthermore,the Quasi-Oppositional-Based Learning(QOBL)mechanism enhances the exploration speed and convergence rate;we name a CQFFA algorithm.The improvements have been made in line with the weaknesses of the FFA algorithm because the FFA algorithm has fallen into the optimal local trap in solving some complex problems or does not have sufficient ability in the intensification component.The results obtained show that the proposed CQFFA model has been significantly improved.It is applied to twenty-three widely-used test functions and compared with similar state-of-the-art algorithms statistically and visually.Also,the CQFFA algorithm has evaluated six real-world engineering problems.The experimental results showed that the CQFFA algorithm outperforms other competitor algorithms.

关键词： Nature-inspired algorithm Farmland fertility algorithm Chaotic maps Quasi Engineering optimization problems

Optofluidic transport and assembly of nanoparticles using an all-dielectric Quasi-BIC metasurface

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Light(Science & Applications) 2023年第9期12卷 1771-1781页

作者： Sen Yang Justus C.Ndukaife Department of Electrical and Computer Engineering Vanderbilt UniversityNashvilleTNUSA Interdisciplinary Materials Science Vanderbilt UniversityNashvilleTNUSA Full list of author information is available at the end of the article

Manipulating fluids by light at the micro/nanoscale has been a long-sought-after goal for lab-on-a-chip applications.Plasmonic heating has been demonstrated to control microfluidic dynamics due to the enhanced and confined light absorption from the intrinsic losses of metals.Dielectrics,the counterpart of metals,has been used to avoid undesired thermal effects due to its negligible light absorption.Here,we report an innovative optofluidic system that leverages a Quasi-BIC-driven all-dielectric metasurface to achieve subwavelength scale control of temperature and fluid motion.Our experiments show that suspended particles down to 200 nanometers can be rapidly aggregated to the center of the illuminated metasurface with a velocity of tens of micrometers per second,and up to millimeter-scale particle transport is demonstrated.The strong electromagnetic field enhancement of the Quasi-BIC resonance increases the flow velocity up to three times compared with the off-resonant situation by tuning the wavelength within several nanometers range.We also experimentally investigate the dynamics of particle aggregation with respect to laser wavelength and power.A physical model is presented and simulated to elucidate the phenomena and surfactants are added to the nanoparticle colloid to validate the model.Our study demonstrates the application of the recently emerged all-dielectric thermonanophotonics in dealing with functional liquids and opens new frontiers in harnessing non-plasmonic nanophotonics to manipulate microfluidic dynamics.Moreover,the synergistic effects of optofluidics and high-Q all-dielectric nanostructures hold enormous potential in high-sensitivity biosensing applications.

关键词： dielectric Quasi negligible

Quasi-Z源逆变器纹波自注入APF及其控制策略

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电机与控制学报 2019年第10期23卷 77-84页

作者：李志勇王思君陈有根中南大学自动化学院

单相Quasi-Z源逆变器交流侧二倍基波频率(二倍频)的功率脉动会使其直流侧不可避免的出现二次纹波。针对单相Quasi-Z逆变器直流侧电感二倍频电流纹波问题提出了一种自注入APF控制策略。运用状态空间平均法研究二倍频能量的传递机理,结合Q... 详细信息

单相Quasi-Z源逆变器交流侧二倍基波频率(二倍频)的功率脉动会使其直流侧不可避免的出现二次纹波。针对单相Quasi-Z逆变器直流侧电感二倍频电流纹波问题提出了一种自注入APF控制策略。运用状态空间平均法研究二倍频能量的传递机理,结合Quasi-Z源网络小信号模型,发现占空比扰动可以影响Quasi-Z源网络能量分布。在直通占空比上叠加补偿信号,在不改变电路拓扑结构的前提下,利用Quasi-Z源网络向逆变桥自注入二倍频能量,抑制Quasi-Z源网络输入功率波动。仿真验证了所提控制策略的有效性,Quasi-Z源网络输入电流纹波幅值降低了 81.4%,并结合反馈控制方法对所提控制的响应速度进行了仿真对比分析。

关键词： Quasi Z 源逆变器纹波传递机理自注入

Quasi-Two-Dimensional Diffusion in Adherent Cells Revealed by Three-Dimensional Single Quantum Dot Tracking

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Chinese Physics Letters 2020年第7期37卷 130-136页

作者：江超李波窦硕星王鹏业李辉 Beijing National Laboratory for Condensed Matter Physics and Laboratory of Soft Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Songshan Lake Materials Laboratory Dongguan 523808China School of Systems Science Beijing Normal UniversityBeijing 100875China

Intracellular diffusion is critical for molecule translocation in cytoplasm and mediates many important cellular processes.Meanwhile,the diffusion dynamics is affected by the heterogeneous cytoplasm.Previous studies on intracellular diffusion are mainly based on two-dimensional(2 D)measurements under the assumption that the three-dimensional(3 D)diffusion is isotropic.However,the real behaviors of 3 D diffusion of molecules in cytoplasm are still unclear.Here,we have built a 3 D single-particle tracking(SPT)microscopy and studied the 3 D diffusion of quantum dots(QDs)in adherent A549 cells.Notably,we found that the intracellular diffusion of QDs is Quasi-2 D,with the axial motion being severely confined.Further investigations demonstrated that disrupting the cytoskeleton component or endoplasmic reticulum(ER)does not alter the Quasi-2 D diffusion pattern,although ER reduces the diffusion rates and slightly relieves the constraint in the axial diffusion.The preferred Quasi-2 D diffusion is quite robust and attributed to the complex cytoarchitectures in the flat adherent cells.With the aid of 3 D SPT method,the Quasi-2 D diffusion in cells was revealed,shedding new light on the physical nature of cytoplasm.

关键词： diffusion Quasi Quantum

Bioinspired Quasi-Solid Ionic Conductors:Materials,Processing,and Applications

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Accounts of Materials Research 2021年第12期2卷 1203-1214页

作者： Zhouyue Lei Peiyi Wu State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of ChemistryChemical Engineering and BiotechnologyCenter for Advanced Low-Dimension MaterialsDonghua UniversityShanghai 201620China John A.Paulson School of Engineering and Applied Sciences Harvard UniversityCambridgeMassachusetts 02138United States

CONSPECTUS:Human−machine interactions in the era of the Internet of Things call for the development of intelligent bionic materials.Inspired by the biological tissues’macromolecular networks and ionic signals,Quasi-solid ionic conductors,including artificial hydrogels and nonvolatile ionic elastomers,have attracted increasing interest as a promising candidate to facilitate the human−machine interactions.Benefiting from many bionic features such as biocompatibility,softness,and ionic conductivity,the Quasi-solid ionic conductors evolve various functions and achieve a broad scope of applications.This Account highlights the recent progress of bioinspired Quasi-solid ionic conductors as a versatile platform for human−machine interactions.It covers topics ranging from materials,processing,and applications to future opportunities and challenges.We begin by introducing bioinspired concepts and the history of artificial ionic conductors.Then,we discuss the optimization of Quasi-solid ionic conductors in terms of mechanical performance,sensory capabilities,optical properties,and environmental stability.Afterward,we introduce processing methods and discuss the integration possibility and recyclability of Quasisolid ionic conductors.Next,we show the human−machine interactions enabled by the Quasi-solid ionic conductors,including skinlike sensors,theranostic patches,and ionic power supplies.In the end,we describe the exciting future of integrated artificial ionic systems and briefly discuss opportunities in bioinspired designs and practical applications of the Quasi-solid ionic conductors.

关键词： stability. Quasi versatile

Stochastic averaging of Quasi partially integrable Hamiltonian systems under fractional Gaussian noise

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2017年第9期18卷 704-717页

作者： Qiang-feng LU Mao-lin DENG Wei-qiu ZHU Department of Mechanics Zhefiang University Hangzhou 310077 China State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang University Hangzhou 310027 China Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province Zhejiang University Hangzhou 310027 China

A stochastic averaging method for predicting the response of Quasi partially integrable and non-resonant Hamiltoniansystems to fractional Gaussian noise （fGla） with the Hurst index 1/2〈H〈l is proposed. The averaged stochastic differential equa-tions （SDEs） for the first integrals of the associated Hamiltonian system are derived. The dimension of averaged SDEs is less thanthat of the original system. The stationary probability density and statistics of the original system are obtained approximately fromsolving the averaged SDEs numerically. Two systems are worked out to illustrate the proposed stochastic averaging method. It isshown that the results obtained by using the proposed stochastic averaging method and those from digital simulation of originalsystem agree well, and the computational time for the former results is less than that for the latter ones.

关键词： Fractional Brownian motion (fBm) Fractional Gaussian noise (fGn) Quasi partially integrable Hamiltonian system Stochastic averaging method Stationary response

Observation of maximal intrinsic chirality empowered by dual Quasi-bound states in the continuum in a planar metasurface

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Photonics Research 2024年第2期12卷 244-252页

作者： XIN QI JIAJU WU FENG WU SONG ZHAO CHAO WU YUEYANG MIN MINA REN YUFEI WANG HAITAO JIANG YUNHUI LI ZHIWEI GUO YAPING YANG WANHUA ZHENG HONG CHEN YONG SUN MOE Key Laboratory of Advanced Micro-Structured Materials School of Physics Science and EngineeringTongji UniversityShanghai 200092China School of Optoelectronic Engineering Guangdong Polytechnic Normal UniversityGuangzhou 510665China l3 Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology School of Physics Science and EngineeringTongji UniversityShanghai 200092China Department of Electrical Engineering Tongji UniversityShanghai 201804China State Key Laboratory on Integrated Optoelectronics Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China

Metasurfaces with spin-selective transmission play an increasingly critical role in realizing optical chiral responses,especially for strong intrinsic chirality,which is limited to complex three-dimensional geometry.In this paper,we propose a planar metasurface capable of generating maximal intrinsic chirality and achieving dual-band spinselective transmission utilizing dual Quasi-bound states in the continuum(Quasi-BICs)caused by the structural symmetry breaking.Interestingly,the value of circular dichroism(CD)and the transmittance of two kinds of circular polarization states can be arbitrarily controlled by tuning the asymmetry parameter.Remarkable CD approaching unity with the maximum transmittance up to 0.95 is experimentally achieved in the dual band.Furthermore,assisted by chiral BICs,the application in polarization multiplexed near-field image display is also exhibited.Our work provides a new avenue to flexibly control intrinsic chirality in planar structure and offers an alternative strategy to develop chiral sensing,multiband spin-selective transmission,and high-performance circularly polarized wave detection.The basic principle and design method of our experiments in the microwave regime can be extended to other bands,such as the terahertz and infrared wavelengths.

关键词： planar intrinsic Quasi

Containment Problem for Quasi Star Configurations of Points in P^2

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Algebra Colloquium 2018年第4期25卷 661-670页

作者： Hassan Haghighi Mohammad Mosakhani Faculty of Mathematics K.N.Toosi University of TechnologyTehranIran

In this paper,the containment problem for the defining ideal of a special type of zero-dimensional subscheme of P^2,the so-called Quasi star configuration,is investigated.Some sharp bounds for the resurgence of these types of ideals are given.As an application of this result,for every real number 0Quasi star configurations are determined.In particular,it is shown that all of these ordinary powers have a linear resolution.

关键词： symbolic power resurgence Waldschmidt constant Quasi star configuration containment problem