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中国科学:物理学 力学 天文学（英文版）
中国科学:物理学 力学 天文学（英文版）

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中国科学:物理学 力学 天文学（英文版）/Journal Science China(Physics, Mechanics&Astronomy)CSCDCSTPCDEISCI
查看更多>>《中国科学》是中国科学院主办、中国科学杂志社出版的自然科学专业性学术刊物。《中国科学》任务是反映中国自然科学各学科中的最新科研成果，以促进国内外的学术交流。《中国科学》以论文形式报道中国基础研究和应用研究方面具有创造性的、高水平的和有重要意义的科研成果。在国际学术界，《中国科学》作为代表中国最高水平的学术刊物也受到高度重视。国际上最具有权威的检索刊物SCI，多年来一直收录《中国科学》的论文。1999年《中国科学》夺得国家期刊奖的第一名。
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    Advancing mid-infrared microdisk laser emission with Tm:YAG

    Zhaocong WangHuiqi LiLei WangYang Tan...
    91-96页
    查看更多>>摘要：Mid-infrared microcavity lasers have important applications in biosensing,mid-infrared spectroscopy,and environmental monitoring.However,the low output power of existing mid-infrared microcavity lasers hinders their practical use.This drawback is attributed to the insufficient laser gain medium,which limits the development of mid-infrared whispering-gallery-mode(WGM)lasers.To address this issue,we have employed ion implantation-enhanced etching to fabricate Tm:YAG thin films as effective gain media for mid-infrared WGM lasers.The Tm:YAG thin film,with a thickness of 2 μm,exhibits excellent fluorescence characteristics.Subsequently,the Tm:YAG thin film is processed using focused ion beam to form microdisks with a diameter of 30 μm.Under 785 nm laser pumping,the maximum output power of the Tm:YAG microdisk at 2023.1 nm is 229 μW,with a slope efficiency of 2.9％.This work demonstrates the outstanding potential of Tm:YAG as a mid-infrared laser gain medium,providing a new option for the development of mid-infrared lasers.
      原文链接:
    • 万方数据
    • 维普

    Inversely engineered metasurfaces for independent manipulation of transmitted and reflected light fields

    Yongjian LiuYu LuoFei ZhangMingbo Pu...
    97-106页
    查看更多>>摘要：Independent manipulation of transmitted and reflected light fields is a key technology for the realization of multifunctional optical applications,which can be implemented based on multilayered plasmonic or supercell subwavelength structures.However,the former is not suitable for the optical bands,while the latter is insufficient in generating large phase gradients.Here,an adjoint-optimization-based inverse design methodology is proposed,which utilizes the polarization-selective local inter-ference between individual meta-atoms and enables monolayer dielectric metasurfaces to decouple the wavefront of transmitted and reflected optical fields.Moreover,this methodology serves to mitigate the aperiodic electromagnetic crosstalk inherent between adjacent meta-atoms,consequently leading to a significant enhancement in the performance of meta-devices.We analyzed the physical mechanism of adjoint optimization and proposed the concept of phase factors,highlighting their im-portance in the rapid inverse design of meta-devices—an aspect often overlooked in previous research.To demonstrate the feasibility and robustness of our method,we optimize monolayer metasurfaces with different initial structures.These devices efficiently focus and deflect x-linearly and y-linearly polarized incident light in transmission and reflection spaces,respectively.Overall,this methodology holds immense potential for designing multifunctional,high-performing metasurfaces that meet multiple constraints,opening up broad prospects for applications.
      原文链接:
    • 万方数据
    • 维普

    Tailoring chaotic motion of microcavity photons in ray and wave dynamics by tuning the curvature of space

    Wei LinYechun DingYongsheng WangPeng Li...
    107-112页
    查看更多>>摘要：Microcavity photon dynamics in curved space is an emerging interesting area at the crossing point of nanophotonics,chaotic science,and non-Euclidean geometry.We report the sharp difference between the regular and chaotic motions of cavity photons subjected to the varying space curvature.While the island modes of regular motion rise in the phase diagram in the curved space,the chaotic modes show special mechanisms to adapt to the space curvature,including the fast diffusion of ray dynamics,and the localization and hybridization of the Husimi wavepackets among different periodic orbits.These observations are unique effects enabled by the combination of the chaotic trajectory,the wave nature of light,and the non-Euclidean orbital motion,and therefore make the system a versatile optical simulator for chaotic science under quantum mechanics in curved space-time.
      原文链接:
    • 万方数据
    • 维普

    Refined acoustic holography via nonlocal metasurfaces

    Shuhuan XieHongyu MaJunmei CaoFangshuo Mo...
    113-123页
    查看更多>>摘要：Holography can provide the desired wavefront phase and/or amplitude for imaging,particle manipulation,bacteria trapping,and cell patterning in optics and acoustics.However,previous work on acoustic holography is mostly based on local design opti-mization,either using active control of the sound source or relying on the structural design to provide the desired wavefront.Achieving precise control over the acoustic field remains a significant challenge.Here,we realize refined single-plane sym-metric binary amplitude,asymmetric intensity gradient amplitude,and bi-objective hologram through the non-local holographic imaging theory that considers the acoustic coupling of structural units in detail.By taking into account the self-radiation and mutual radiation between many small units on a plate of well-designed thickness,as well as the transmission through the plate's apertures,we can effectively regulate the sound field behind the plate.We demonstrate the effectiveness of our approach through numerical simulations and experiments,showcasing a circle,a black hole,and a bi-objective with a circle and a square hologram.Notably,the acoustic black hole hologram precisely reconstructs the intensity gradient distribution at two bright spots.This non-local holographic imaging theory is valuable for the fine-intensity regulation of the sound field and is expected to be applied in ultrasound diagnosis and treatment,medical imaging,and other fields.
      原文链接:
    • 万方数据
    • 维普

    Isolation performances and optimization of triple quasi-zero stiffness isolators

    Yuntian ZhangGuangnan ZhuQingjie Cao
    124-141页
    查看更多>>摘要：In this paper,triple quasi-zero stiffness(QZS)passive vibration isolators whose restoring force curve has a three-stage softening effect are proposed.Multi-coupled SD oscillators with three independent geometrical parameters are used as negative stiffness mechanisms to achieve QZS characteristics at the origin and symmetrical positions on both sides of the origin.Isolation perfor-mances of different triple QZS isolators are analyzed to show influences of the selection of QZS regions away from the origin on the range of isolation regions.Pareto optimizations of system parameters are carried out to get a larger range of small restoring force regions and small stiffness regions.Isolation performances of two triple QZS isolators are discussed to show the influence of different Pareto optimization solutions through the comparisons with single and double QZS isolators.Results showed that triple QZS isolators have both the advantages of single and double QZS isolators which results in better isolation performances under both small and large excitation amplitudes.An improvement in isolation performances for triple QZS isolators is found with the decrease in average stiffness due to the appearance of two symmetrical QZS regions away from the origin.Larger displacements of QZS regions away from the origin result in better isolation performances when excitation amplitude is large,and triple QZS characteristics are similar to double QZS isolators at this time.Smaller restoring forces of QZS regions away from the origin lead to better isolation performances when excitation amplitude is small,and triple QZS characteristics are similar to single QZS isolators at this moment.Compared with the decrease in average stiffness,the improvement of isolation performances shows a hysteresis phenomenon due to the difference between static and dynamic characteristics.
      原文链接:
    • 万方数据
    • 维普

    Imaging momentum-space Cooper pair formation and its competition with the charge density wave gap in a kagome superconductor

    Yiming SunYubing TuYang LuoShuikang Yu...
    142-150页
    查看更多>>摘要：The superconducting ground state of kagome metals AV3Sb5(where A stands for K,Rb,or Cs)emerges from an exotic charge density wave(CDW)state that potentially breaks both rotational and time reversal symmetries.However,the specifics of the Cooper pairing mechanism,and the nature of the interplay between these two states remain elusive,largely due to the lack of momentum-space(k-space)superconducting energy gap structure.By implementing Bogoliubov quasiparticle interference(BQPI)imaging,we obtain k-space information on the multiband superconducting gap structure ΔiSC(k)in pristine CsV3Sb5.We show that the estimated energy gap on the vanadium dxy/x2-y2 orbital is anisotropic but nodeless,with a minimal value located near the M point.Interestingly,a comparison of ΔiSC(k)with the CDW gap ΔiCDW(k)obtained by angle-resolved photoemission spectroscopy(ARPES)reveals direct k-space competition between these two order parameters,i.e.,the opening of a large(small)CDW gap at a given momentum corresponds to a small(large)superconducting gap.When the long-range CDW order is suppressed by replacing vanadium with titanium,we find a nearly isotropic energy gap on both the V and Sb bands.This information will be critical for identifying the microscopic pairing mechanism and its interplay with intertwined electronic orders in this kagome superconductor family.
      原文链接:
    • 万方数据
    • 维普

    Even-odd layer-dependent multiferroic in freestanding rare-earth orthorhombic perovskite

    Shaowen XuFanhao JiaNing Dai
    151-157页
    查看更多>>摘要：Freestanding oxide perovskites possess strong interlayer coupling between adjacent atomic layers,thus exerting a determinative effect on the magnetism and ferroelectricity of these atomic-scale materials.Here,we propose an effective strategy to manipulate magnetism and ferroelectricity in freestanding rare-earth orthorhombic perovskite via modulation of layer thickness.By per-forming first-principles calculations,an even-odd oscillation is demonstrated in few-layer GdAlO3 perovskite(GAP).Speci-fically,odd-layer systems with charged atomic layers are ferromagnetic polar metals,while even-layer systems are antiferromagnetic ferroelectric semiconductors.This thickness-dependent magnetic phase transition originates from carrier doping,as rationalized by the Stoner criterion.Furthermore,we demonstrate the promotion of in-plane ferroelectricity via the concurrent application of two distinct antiferrodistortive displacements,each driven by formation and breaking of bonds.Analogous multiferroic phases may emerge in other transition metal oxide perovskites supporting multiple valence states,e.g.,few-layer GdMO3(M=V,Cr,Mn,and Ni).This work puts forward a strategy for layer thickness engineering of magnetism and ferroelectricity in 2D oxide perovskite multiferroic materials.
      原文链接:
    • 万方数据
    • 维普

    Optical system for extremely large spectroscopic survey telescope

    Ding-qiang SuHua BaiXiangyan YuanXiangqun Cui...
    158-174页
    查看更多>>摘要：This article presents research work on a spectroscopic survey telescope.Our idea is as follows:for such a telescope,a pure reflecting optical system is designed,which should have an aperture and a field of view(FOV)both as large as possible and excellent image quality,and then a strip lensm(lens-prism)atmospheric dispersion corrector(S-ADC)is added,only for correcting the atmospheric dispersion.Given the fund limitation and the simplicity of scaling up,some 12-m telescopes are designed as examples.Su,Korsch,and Meinel put forward the four-mirror Nasmyth systems Ⅰand Ⅱ which are used in this paper.FOVs of 1.5°,2°,and 2.5° are selected.For all systems,the image qualities are excellent.Because the S-ADC relaxes the optical glass size restriction,this 12-m telescope with a FOV of 2.5° can be magnified in proportion to a 16-m telescope.Its etendue(from French étendue)and focal surface will now be the largest in the world.In such a telescope,a pure reflecting optical system can also be obtained.A subsequent coudé system is designed with excellent image quality.
      原文链接:
    • 万方数据
    • 维普

    Near real-time gravitational wave data analysis of the massive black hole binary with TianQin

    Hong-Yu ChenXiang-Yu LyuEn-Kun LiYi-Ming Hu...
    175-186页
    查看更多>>摘要：Space-borne gravitational wave(GW)detectors can detect the merger of massive black holes.The early warning and localiza-tion of GW events before merging can be used to inform electromagnetic telescopes and conduct multimessenger observations.However,this requires real-time data transmission and analysis capabilities.The geocentric orbit of the space-borne GW detector TianQin makes it possible to conduct real-time data transmission.In this study,we develop a search and localization pipeline for massive black hole binaries(MBHBs)with TianQin under both regular and real-time data transmission modes.We demonstrate that,with real-time data transmission,MBHBs can be accurately localized on the fly.With the approaching merger,each analysis can be finished in only 40 min.For an MBHB system at a distance of 1 Gpc,if we receive data every hour,then we can pinpoint its location to within less than 1 deg2 on the final day before the merger.
      原文链接:
    • 万方数据
    • 维普

    Quantum integrated nonlocal sensing of dynamic object

    Jiachen LiuQiwen Zhan
    187页
      原文链接:
    • 万方数据
    • 维普