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Single-emitter super-resolved imaging of radiative decay rate enhancement in dielectric gap nanoantennas

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Light(Science & Applications) 2024年第1期13卷 47-54页

作者： R.Margoth Córdova-Castro Bart van Dam Alberto Lauri Stefan A.Maier Riccardo Sapienza Yannick De Wilde Ignacio Izeddin Valentina Krachmalnicoff Institut Langevin ESPCI ParisPSL UniversityCNRSParisFrance The Blackett Laboratory Department of PhysicsImperial College LondonLondonUK School of Physics and Astronomy Monash UniversityClaytonVictoriaAustralia Chair in Hybrid Nanosystems Ludwig-Maximilians Universität MünchenMuenchenGermany Department of Physics University of OttawaOttawaONCanada

High refractive index dielectric nanoantennas strongly modify the decay rate via the Purcell effect through the design of radiative channels.Due to their dielectric nature,the field is mainly confined inside the nanostructure and in the gap,which is hard to probe with scanning probe techniques.Here we use single-molecule fluorescence lifetime imaging microscopy(smFLIM)to map the decay rate enhancement in dielectric GaP nanoantenna dimers with a median localization precision of 14 nm.We measure,in the gap of the nanoantenna,decay rates that are almost 30 times larger than on a glass substrate.By comparing experimental results with numerical simulations we show that this large enhancement is essentially radiative,contrary to the case of plasmonic nanoantennas,and therefore has great potential for applications such as quantum optics and biosensing.

关键词： dielectric decay radiative

Global Existence and decay of Solutions for a Class of a Pseudo-Parabolic Equation with Singular Potential and Logarithmic Nonlocal Source

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Journal of Applied Mathematics and Physics 2024年第1期12卷 181-193页

作者： Xiaoxin Yang School of Mathematics and Statistics Changchun University of Science and Technology Changchun China

This article investigates the well posedness and asymptotic behavior of Neumann initial boundary value problems for a class of pseudo-parabolic equations with singular potential and logarithmic nonlinearity. By utilizing cut-off techniques and combining with the Faedo Galerkin approximation method, local solvability was established. Based on the potential well method and Hardy Sobolev inequality, derive the global existence of the solution. In addition, we also obtained the results of decay.

关键词： Nonlocal Parabolic Equation Singular Potential Logarithmic Nonlocal Source Global Existence decay

Extreme single-excitation subradiance from two-band Bloch oscillations in atomic arrays

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Photonics Research 2024年第3期12卷 571-580页

作者： LUOJIA WANG DA-WEI WANG LUQI YUAN YAPING YANG XIANFENG CHEN State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Interdisciplinary Center for Quantum Information and State Key Laboratory of Modern Optical Instrumentation Zhejiang Province Key Laboratory of Quantum Technology and Deviceand School of PhysicsZhejiang UniversityHangzhou 310027China MOE Key Laboratory of Advanced Micro-Structured Materials School of Physics Science and EngineeringTongji UniversityShanghai 200092China Shanghai Research Center for Quantum Sciences Shanghai 201315China Collaborative Innovation Center of Light Manipulations and Applications Shandong Normal UniversityJinan 250358China

Atomic arrays provide an important quantum optical platform with photon-mediated dipole–dipole interactions that can be engineered to realize key applications in quantum information processing.A major obstacle for such applications is the fast decay of the excited states.By controlling two-band Bloch oscillations of single excitation in an atomic array under an external magnetic field,here we show that exotic subradiance can be realized and maintained with orders of magnitude longer than the spontaneous decay time in atomic arrays with the finite size.The key finding is to show a way for preventing the wavepacket of excited states scattering into the dissipative zone inside the free space light cone,which therefore leads to the excitation staying at a subradiant state for an extremely long decay time.We show that such operation can be achieved by introducing a spatially linear potential from the external magnetic field in the atomic arrays and then manipulating interconnected two-band Bloch oscillations along opposite directions.Our results also point out the possibility of controllable switching between superradiant and subradiant states,which leads to potential applications in quantum storage.

关键词： excitation Bloch decay

Nanotechnology approaches towards biodeterioration-resistant wood:A review

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Journal of Bioresources and Bioproducts 2024年第1期9卷 3-26页

作者： Ayyoob Arpanaei Qiliang Fu Tripti Singh Scion Private Bag 3020Rotorua 3046New Zealand Co-Innovation Center of Efficient Processing and Utilization of Forest Resources College of Materials Science and EngineeringNanjing Forestry UniversityNanjing 210037China

Wood can be a suitable alternative to energy-intensive materials in various applications.Nev-ertheless,its susceptibility to weathering and decay has significantly hindered the broad adop-tion of the most commercially significant wood species.While current solutions do tackle certain challenges,they often come with disadvantages like high costs,environmental risks,and/or in-efficiencies.Nanotechnology-based methods can be employed to mitigate these weaknesses and create durable,sustainable wood materials.In this review,we delve into cutting-edge advance-ments in the development of biodeterioration-resistant wood through innovative nanotechnol-ogy approaches.These methods usually involve the application of nanomaterials,either pos-sessing biocidal properties or serving as carriers for biocides.We systematically describe these approaches and compare them to conventional wood modification methods.Additionally,this re-view provides a brief overview of the prevalent biodeteriorating organisms and their mechanisms of action,which notably impact the development and choice of a suitable strategy for wood mod-ification/treatment.Given the requirements of biodeteriorating organisms for growth and wood degradation,it is expected that the new nanotechnology-based approaches to enhance wood dura-bility may provide innovative broad-spectrum biocidal nanosystems.These systems can simulta-neously induce alterations in the physicochemical properties of wood,thereby constraining the availability of the growth requirements.These alterations can efficiently inhibit the biodeterio-ration process by decreasing water absorption,restricting access to the wood components,and reducing void spaces within the wood structure.Finally,this review highlights the new oppor-tunities,challenges,and perspectives of nanotechnology methods for biodeterioration-resistant wood,through which some techno-economic,environmental and safety aspects associated with these methods are addressed.

关键词： Wood durability decay Wood modification Biodeterioration mechanisms Biocides Wood nanotechnology

Dissipation-Driven Superradiant Phase Transition of a Two-Dimensional Bose-Einstein Condensate in a Double Cavity

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Chinese Physics Letters 2024年第6期41卷 44-48页

作者： Bo-Hao Wu Xin-Xin Yang Yu Chen Wei Zhang Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices Renmin University of ChinaBeijing 100872China Key Laboratory of Quantum State Construction and Manipulation(Ministry of Education) Renmin University of ChinaBeijing 100872China Graduate School of China Academy of Engineering Physics Beijing 100193China Beijing Academy of Quantum Information Sciences Beijing 100193China

We study superradiant phase transitions in a hybrid system of a two-dimensional Bose–Einstein condensate of atoms and two cavities arranged with a tilt angle.By adjusting the loss rate of cavities,we map out the phase diagram of steady states within a mean field framework.It is found that when the loss rates of the two cavities are different,superradiant transitions may not occur at the same time in the two cavities.A first-order phase transition is observed between the states with only one cavity in superradiance and both in superradiance.In the case that both cavities are superradiant,a net photon current is observed flowing from the cavity with small decay rate to the one with large decay rate.The photon current shows a non-monotonic dependence on the loss rate difference,owing to the competition of photon number difference and cavity field phase difference.Our findings can be realized and detected in experiments.

关键词： Einstein transitions decay

Production of charmonium pentaquarks from b-baryon and B-meson decays:SU(3)analysis

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Chinese Physics C 2024年第5期48卷 107-116页

作者：韩伟毫邢晔徐吉 School of Physics and Microelectronics Zhengzhou UniversityZhengzhou 450001China School of Physics China University of Mining and TechnologyXuzhou 221000China

Here,we study the production of charmonium pentaquarks cc¯qqq from bottom baryon and B-meson decays under the flavor SU(3)symmetry.decay amplitudes for various processes are parameterized in terms of SU(3)irreducible nonperturbative amplitudes.Numerous relations between decay widths are deduced.Moreover,the strong decays of pentaquarks are considered.Our results can be tested in future measurements at LHCb,Belle II,and CEPC.Once decay branching fractions are measured,this study will be useful for the exploration of new decay channels and pentaquark states.

关键词： pentaquark SU(3)symmetry decay

Spatial expression of the nonsense-mediated mRNA decay factors UPF3A and UPF3B among mouse tissues

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2023年第11期24卷 1062-1068页

作者： Xin MA Yan LI Chengyan CHEN Yanmin SHEN Hua WANG Tangliang LI State Key Laboratory of Microbial Technology Shandong UniversityQingdao266237China Key Laboratory of Aging and Cancer Biology of Zhejiang Province Department of Pathology and PathophysiologySchool of Basic Medical SciencesHangzhou Normal UniversityHangzhou311121China

Nonsense-mediated mRNA decay(NMD)is a highly conserved post-transcriptional gene regulatory mechanism in eukaryotes(Lykke-Andersen and Jensen,2015;Kurosaki et al.,2019;Yi et al.,2021;Karousis and Muhlemann,2022;Mailli... 详细信息

关键词： Andersen decay

Supercurrent decay in ballistic magnetic Josephson junctions

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npj Computational Materials 2022年第1期8卷 186-196页

作者： HervéNess Ivan A.Sadovskyy Andrey E.Antipov Mark van Schilfgaarde Roman M.Lutchyn Department of Physics King’s College LondonStrand CampusLondonWC2R 2LSUK Microsoft Quantum Microsoft Station QUniversity of CaliforniaSanta BarbaraCA93106USA National Renewable Energy Laboratory GoldenCO80401USA

We investigate transport properties of ballistic magnetic Josephson junctions and establish that suppression of supercurrent is an intrinsic property of the junctions,even in absence of disorder.By studying the role of ferromagnet thickness,magnetization,and crystal orientation we show how the supercurrent decays exponentially with thickness and identify two mechanisms responsible for the effect:(i)large exchange splitting may gap out minority or majority carriers leading to the suppression of Andreev reflection in the junction,(ii)loss of synchronization between different modes due to the significant dispersion of the quasiparticle velocity with the transverse momentum.Our results for Nb/Ni/Nb junctions are in good agreement with recent experimental studies.Our approach combines density functional theory and the Bogoliubov-de Gennes model and opens a path for material composition optimization in magnetic Josephson junctions and superconducting magnetic spin valves.

关键词： Josephson decay magnetic

Free-radical evolution and decay in cross-linked polytetrafluoroethylene irradiated by gamma-rays

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Nuclear Science and Techniques 2022年第5期33卷 113-125页

作者： Fei-Xiang Sha Guo-Jun Cheng Zi-Yue Xuan Yang Liu Wei-Hua Liu Xiao-Dong Zhang Zhong-Feng Tang School of Materials Science and Engineering Anhui University of Science and TechnologyHuainan 232000China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China National Key Laboratory of Materials Behavior and Evaluation Technology in Space Environment Harbin Institute of TechnologyHarbin 150001China University of Chinese Academy of Sciences Beijing 100049China

Electron spin resonance techniques were employed to investigate the effects of the absorbed dose and post-irradiation conditions on the evolution and decay of free-radicals in cross-linked polytetrafluoroethylene(XPTFE),induced byγ-ray radiation.Chain-end free-radicals,chain alkyl free-radicals,and tertiary alkyl free-radicals were detected when XPTFE was irradiated under Ar atmosphere.The corresponding peroxy free-radicals were formed upon exposure of irradiated XPTFE to air;the freeradicals concentration first increased linearly with increasing absorbed dose and then gradually saturated.The free-radicals yield under air atmosphere was greater than that under Ar,and the peroxy free-radicals were preserved for a relatively long time when irradiated XPTFE was stored under air atmosphere.The chain alkyl free-radicals may be converted to chain end free-radicals byβ-scission,while chain end free-radicals are more sensitive to oxygen than chain alkyl free-radicals.When the annealing temperature was raised above the a-transition temperature of XPTFE,the decay of the free-radicals was greatly affected and accelerated by the motion of the molecules over the long range.

关键词： Polytetrafluoroethylene Cross-linked polytetrafluoroethylene Electron spinresonance decay Radiation c-ray