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Turbulent drag reduction by sector-shaped counter-flow dielectric barrier discharge plasma actuator

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Chinese Physics B 2025年第2期34卷 362-370页

作者： Borui Zheng Shaojie Qi Minghao Yu Jianbo Zhang Linwu Wang Dongliang Bian School of Automation and Information Engineering Xi’an University of TechnologyXi’an 710048China School of Mechanical and Precision Instrument Engineering Xi’an University of TechnologyXi’an 710048China Science and Technology on Plasma Dynamics laboratory Air Force Engineering UniversityXi’an 710038China Shaanxi Key laboratory of Complex System Control and Intelligent Information Processing Xi’an 710048China Shaanxi University Key laboratory of photonic Power Devices and Discharge Regulation Xi’an 710048China

The primary objective in aircraft transportation is to minimize turbulent drag, thereby conserving energy and reducing emissions. We propose a sector-shaped counter-flow dielectric barrier discharge plasma actuator, which leverages jet synthesis for drag reduction. A drag control experiment was conducted in a low-speed wind tunnel with a controlled flow velocity of 9.6 m/s(Re = 1.445 × 10^(4)). This study investigated the effects of varying pulse frequencies and actuation voltages on the turbulent boundary layer. Using a hot-wire measurement system, we analyzed the pulsating and time-averaged velocity distributions within the boundary layer to evaluate the streamwise turbulent drag reduction. The results show that the local TDR decreases as the pulse frequency increases, reaching a maximum reduction of approximately 20.97% at a pulse frequency of 50 Hz. In addition, as the actuation voltage increases, the friction coefficient decreases, increasing the drag reduction rate. The maximum drag reduction of approximately 33.34% is achieved at an actuation voltage of 10 kV.

关键词： plasma flow control turbulent boundary layer turbulent drag reduction

Rotation-induced plasmonic chiral quasi-bound states in the continuum

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photonics Research 2025年第01期13卷 69-79页

作者： CHUNHUA QIN YADONG DENG TIANSHUO LYU CHAO MENG S?REN IM SANDE SERGEY I.BOZHEVOLNYI JINHUI SHI FEI DING Key laboratory of In-Fiber Integrated Optics of Ministry of Education and Key laboratory of photonic Materials and Devices Physics for Oceanic Applications of Ministry of Industry and Information Technology College of Physics and Optoelectronic EngineeringHarbin Engineering University Centre for Nano Optics University of Southern Denmark

Nanoscale light manipulation using plasmonic metasurfaces has emerged as a frontier in photonic research,offering strongly enhanced light-matter interactions with potential applications in sensing,communications,and quantum ***,we unveil the realization and control of chiral quasi-bound states in the continuum(quasi-BICs) by judiciously rotating one of the paired plasmonic bricks and thereby influencing structural *** precisely controlling the rotation angle,we enable continuous modulation of the radiation loss in quasiBICs and transition from a perfect half-wave plate to a good absorber for the left-handed circularly polarized *** transformation leverages the intrinsic chirality with moderately high circular dichroism of ～0.35 in both simulation and experimental observations,manifesting unprecedented control over the chiral light within subwavelength *** modeling and numerical simulations complement our experimental findings,offering deep insights into underlying mechanisms and the role of symmetry breaking in realizing chiral *** observed phenomena open new pathways for developing ultra-compact chiral photonic devices with tailored optical properties,including highly sensitive chiral biosensors,circular dichroism spectroscopy,and chiral flat optical components for information processing.

关键词： Dichroism

Machine learning driven rational design of dual atom catalysts on graphene for carbon dioxide electroreduction

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Nano Research 2025年第1期18卷 186-194页

作者： Dongxu Jiao Xinyi Li Mingzi Sun Lin Liu Jinchang Fan Jingxiang Zhao Bolong Huang Xiaoqiang Cui State Key laboratory of Automotive Simulation and Control School of Materials Science and Engineeringand Key Laboratory of Automobile Materials of MOEJilin UniversityChangchun 130012China Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina College of Chemistry and Chemical Engineering and Key Laboratory of Photonic and Electronic Bandgap MaterialsMinistry of EducationHarbin Normal UniversityHarbin 150025China

The development of high-performance atomiccatalysts for the carbon dioxide reduction reaction(CO_(2)RR)is atime-consuming process due to the complexity of the reactionmechanism and the uncertainty of the active ***,wehave proposed combining density functional theory(DFT)andmachine learning(ML)to investigate the potential of topologicalgraphene-based dual-atom catalysts(DACs)as CO_(2)*** analyzing the ML results,we identify thenumber of d-orbital electrons in the active site as a key factorinfluencing the CO_(2)RR catalytic ***,wepropose a simple descriptor to measure the CO_(2)RR activity ofthese *** findings provide plausible explanations for thesynergistic interactions between bimetallic atoms in CO_(2)RR andallow us to screen the homogeneous Ni-Ni pair as the mostpromising dual-atom *** work offers a fast MLapproach based on limited DFT calculations to predict the mostelectroactive and stable DACs on carbon support for CO_(2)RR,facilitating rapid screening of high-performance dual-atomcatalysts.

关键词： CO_(2)reaction reduction dual-atom catalysts density functional theory machine learning

Nonlinear behavior of the population dynamics of three-level systems in the presence of single photon absorption

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Chinese Physics B 2019年第2期28卷 272-276页

作者： Allam Srinivasa Rao photonic Sciences laboratory Physical Research Laboratory

We numerically investigate the population dynamics in a single photon resonant three-level cascade and non-cascade energy level molecules at 532-nm wavelength. The time-dependent population in the energy levels in the presence of 100 ps(pico-second) and 100 ns(nano-second) laser pulses is described in the form of rate equations. We provide a brief idea of how the optical energy transfer takes place in the light-matter interaction and we also discuss the absorption as a function of pulse width and repetition rate. We also plot the z-scan transmittance curve as a function of number of excitation pulses participating in the absorption.

关键词： nano-second laser pico-second laser nonlinear absorption z-scan

Carbon Dots-Modified Hollow Mesoporous photonic Crystal Materials for Sensitivityand Selectivity-Enhanced Sensing of Chloroform Vapor

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Nano-Micro Letters 2025年第4期17卷 381-398页

作者： Junchen Liu Ji Liu Zhipeng Li Liupeng Zhao Tianshuang Wang Xu Yan Fangmeng Liu Xiaomin Li Qin Li Peng Sun Geyu Lu Dongyuan Zhao State laboratory On Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012People’s Republic of China Department of Chemistry and laboratory of Advanced Materials Shanghai Key Laboratory of Molecular Catalysis and Innovative MaterialsState Key Laboratory of Molecular Engineering of PolymersCollaborative Innovation Center of Chemistry for Energy Materials(2011-iChEM)College of Chemistry and MaterialsFudan UniversityShanghaiPeople’s Republic of China School of Engineering and Built Environment Griffith UniversityNathanQLD 4111Australia

Chloroform and other volatile organic pollutants have garnered widespread attention from the public and researchers,because of their potential harm to the respiratory system,nervous system,skin,and ***,research on chloroform vapor sensing is still in its early stages,primarily due to the lack of specific recognition *** we report a mesoporous photonic crystal sensor incorporating carbon dots-based nanoreceptor(HMSS@CDs-PCs)for enhanced chloroform *** colloidal PC packed with hollow mesoporous silica spheres provides an interconnected ordered macro-meso-hierarchical porous structure,ideal for rapid gas sensing utilizing the photonic bandgap shift as the readout *** as-synthesized CDs with pyridinic-N-oxide functional groups adsorbed in the hollow mesoporous silica spheres are found to not only serve as the chloroform adsorption sites,but also a molecular glue that prevents crack formation in the colloidal *** sensitivity of HMSS@CDs-PCs sensor is 0.79 nm ppm^(-1)and an impressively low limit of detection is 3.22 ppm,which are the best reported values in fast-response chloroform vapor sensor without multi-signal *** positive response time is 7.5 s and the negative response time 9 ***,relatively stable sensing can be maintained within a relative humidity of 20%-85%RH and temperature of 25-55℃.This study demonstrates that HMSS@CDs-PCs sensors have practical application potential in indoor and outdoor chloroform vapor detection.

关键词： Carbon dots photonic crystal sensors Sensitivity-enhanced sensing Selectivity-enhanced sensing Chloroform vapor sensing

Surfing the nano-wave:Emerging trends in cancer diagnostics and therapy

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Nano Research 2025年第1期18卷 520-544页

作者： Genping Fu Yuting Weng Yunfan Li Carl Ho Yiyu Fu Wenxuan Wang Songbin Fu Wenjing Sun Jie Lin Xiaoyu Fan Binbin Jia Mengdi Cai Linlin Li laboratory of Medical Genetics Harbin Medical UniversityHarbin 150081China Key laboratory of Preservation of Human Genetics Resources and Disease Control in China(Harbin Medical University) Ministry of EducationHarbin 150081China Beijing Key laboratory for Optical Materials and photonic Devices Department of ChemistryCapital Normal UniversityBeijing 100048China College of Materials and Chemical Engineering Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion MaterialsChina Three Gorges UniversityYichang 443002China Washington University School of Medicine in St.Louis St.LouisMO 63110USA Ningbo Institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo 315201China Aix-Marseille College Wuhan University of TechnologyWuhan 430070China

Facing the growing global challenge posed by cancer,the quest for more accurate and potent cancer diagnostic and therapeutic strategies continues to require a multidisciplinary integration *** review firstly summarizes various types of nanoparticles in cancer ***,it offers a comprehensive overview of signalenhancing techniques for visualizing in situ tumors,along with multimodal diagnostic methods for detecting *** for tumor therapy,cutting-edge drug delivery methods that can cross biological barriers and the pinpoint targeting of tumor lesions for precise medical intervention are *** the domain of therapeutic diagnostics,we elucidate the theoretical underpinnings and structural paradigms that underlie a spectrum of advanced diagnostic and therapeutic ***,we present a compendium of publications delineating the clinical applications of each nano-based theragnostic integration ***,this comprehensive review discusses the safety concerns pertaining to the clinical application of nanoparticles and proposes some strategic recommendations to enhance the precision and safety of theragnostic-guided,nanotechnology-based clinical practices.A deeper understanding of nanomaterials,together with intimate interdisciplinary collaborations,nano-wave will most probably guide human beings to win the battle against cancers.

关键词： nanoparticles drug delivery gastric cancer glioma glioblastoma

Phosphor-free white light-emitting diodes

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Chinese Physics B 2015年第6期24卷 75-82页

作者：郭霞刘巧莉李冲刘白董建沈光地 photonic Research laboratory Beijing University of Technology

The multiple color-matching schemes that could improve the color rendering index for phosphor-free white LEDs are discussed. Then we review a few of the recent research directions for phosphor-free white LEDs, which include the development of monolithic GaN-based white LEDs and hybrid integrated GaN-based and A1GalnP-based white LEDs. These development paths will pave the way toward commercial application of phosphor-free white LEDs in the coming years.

关键词： phosphor-free white light-emitting diodes color rendering index hybrid integration

Ultra-high-Q photonic crystal nanobeam cavity for etchless lithium niobate on insulator(LNOI)platform

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Opto-Electronic Advances 2025年第1期8卷 59-70页

作者： Zhi Jiang Cizhe Fang Xu Ran Yu Gao Ruiqing Wang Jianguo Wang Danyang Yao Xuetao Gan Yan Liu Yue Hao Genquan Han State Key laboratory of Wide-Bandgap Semiconductor Devices and Integrated Technology School of MicroelectronicsXidian UniversityXi’an 710071China Key laboratory of Light Field Manipulation and Information Acquisition Ministry of Industry and Information Technologyand Shaanxi Key Laboratory of Optical Information TechnologySchool of Physical Science and TechnologyNorthwestern Polytechnical UniversityXi’an 710129China Hangzhou Institute of Technology Xidian UniversityHangzhou 311200China

The expansive spectral coverage and superior optical properties of lithium niobate(LN)offer a comprehensive suite of tools for exploring novel *** high-quality(Q)photonic resonator cavities is crucial for enhancing light-matter ***,this task is challenging as the device performance is heavily dependent on the fabrication quality of the *** this paper,we present experimental validation of an etchless approach to fabricating high-Q photonic crystal nanobeam cavities(PCNBCs).We successfully fabricate PCNBCs with Q factors exceeding 105 while maintaining high transmittance by capitalizing on the low waveguide loss and high fabrication tolerance of TE-polarized ***,the Q factor achieved here exceeds previous reports on etchless LN PCNBCs by over an order of *** from this advancement,we further explore a variety of optical functions,including thermo-optic tuning,optically induced bistability,and Fano line shapes *** findings present promising prospects for a versatile platform technique,facilitating the development of high-performance electro-optic or acousto-optic modulators,optical logic devices,and quantum photonics,highlighting its significant impact in the field of photonic integration.

关键词： photonic crystal nanobeam cavity LNOI platform high Q thermo-optic tuning bistability Fano line shapes

Long-range-interacting topological photonic lattices breaking channel-bandwidth limit

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Light(Science & Applications) 2024年第10期13卷 2367-2375页

作者： Gyunghun Kim Joseph Suh Dayeong Lee Namkyoo Park Sunkyu Yu Department of Electrical and Computer Engineering Intelligent Wave Systems LaboratorySeoul National UniversitySeoul 08826Korea Department of Electrical and Computer Engineering Photonic Systems LaboratorySeoul National UniversitySeoul 08826Korea

The presence of long-range interactions is crucial in distinguishing between abstract complex networks and wave *** photonics,because electromagnetic interactions between optical elements generally decay rapidly with spatial distance,most wave phenomena are modeled with neighboring interactions,which account for only a small part of conceptually possible ***,we explore the impact of substantial long-range interactions in topological *** demonstrate that a crystalline structure,characterized by long-range interactions in the absence of neighboring ones,can be interpreted as an overlapped *** overlap model facilitates the realization of higher values of topological invariants while maintaining bandgap width in photonic topological *** breaking of topology-bandgap tradeoff enables topologically protected multichannel signal processing with broad *** practically accessible system parameters,the result paves the way to the extension of topological physics to network science.

关键词： topological breaking neighboring