物理与天体物理最新文献_第10页

Laser cladding of crack-free reliably-joined FeAl50CrNi composite coatings with minimized porosity and improved microstructure to notably enhance electrochemical corrosion plus wear resistance for aluminum alloy 7075 plate surfaces 激光熔覆无裂纹可靠连接FeAl50CrNi复合镀层，气孔率最小，显微组织改善，显著提高了7075铝合金板表面的电化学腐蚀和耐磨性

IF 5 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2026-06-01 Epub Date: 2026-02-10 DOI: 10.1016/j.optlastec.2026.114838

Houxiao Wang , Jilong Li , Wuhong Xin

More and more structural members have been fabricated by using the premium aluminum alloy 7075 (AA7075) because of its excellent properties such as ultra high strength and very high specific strength. However, the AA7075 is a difficult-to-clad material, which usually can not meet the harsh long-term service requirements for the corrosive environments and/or under the wear working conditions. Accordingly, in this study, the novel FeAl50CrNi composite powder, which is the Fe-Al based alloy cladding powder properly mixed by SS304, Fe60 and Al with a recommended weight percent ratio of 2:3:5, is first reported based on the composition ratio design, comparison and proper selection. Assisted by preheating and heat preservation, the FeAl50CrNi composite powder was utilized for carrying out laser cladding experiments on the AA7075 plate surfaces via altering key laser parameters. It was indicated that the challenging problems (e.g., serious occurrence of cracks and pores, incomplete melt, slag entrapment, as well as poor interface fusion and joining) usually encountered during laser cladding for aluminum alloys were concurrently well solved by using the newly-developed composite cladding powder, as well as preferred defocus distance of −5 mm, focal spot diameter of 4.5 mm, and laser power of 1600 W. That is to say, the high-quality FeAl50CrNi composite coatings, which were well melted, mixed, fused and then metallurgically and reliably bound onto the AA7075 plate surfaces, were successfully achieved nearly without cladding defects by using laser cladding in this work. As compared to the AA7075 substrate, the wear resistance and corrosion resistance of laser cladded high-quality FeAl50CrNi composite coatings were improved concurrently and effectively by using a proper laser power of 1600 W. Such improvements achieved were reported in terms of a maximum micro hardness improvement of 116.67%, an averaged friction coefficient reduction of 31.43%, a wear loss reduction of 77.66% during half an hour, and a reduction of 31.23% in corrosion current density. As demonstrated, as a result of the notable alterations in terms of the effective energy inputs, laser fluences, heating–cooling rates and element diffusion, the microstructure characteristics notably altered from the coating top to the fusion zone inside the laser cladded area. Interestingly, these internal coating microstructure changes were characterized primarily by means of the dispersively distributed acicular Fe-Al intermetallic compounds (coating top), the dispersively distributed tiny second phase particles (coating middle), and the fine equiaxed and columnar grains (fusion zone). Importantly, such microstructure characteristics made the coatings possess the overall good mechanical performance in strength, ductility and toughness, micro hardness, wear resistance and corrosion resistance.

优质铝合金7075 （AA7075）由于具有超高强度、超高比强度等优异性能，越来越多的结构构件采用AA7075制造。然而，AA7075是一种难以包覆的材料，通常不能满足腐蚀环境和/或磨损工作条件下苛刻的长期使用要求。因此，在本研究中，通过配比设计、对比和合理选择，首次报道了以SS304、Fe60和Al适当混合的Fe-Al基合金包覆粉，推荐重量百分比为2:3:5。在预热和保温的辅助下，通过改变关键激光参数，利用FeAl50CrNi复合粉末对AA7075板表面进行激光熔覆实验。结果表明，该复合熔覆粉末较好地解决了铝合金激光熔覆过程中存在的裂纹和气孔严重、熔不完全、夹渣、界面熔接不良等难题，且优选的离焦距离为- 5 mm，焦斑直径为4.5 mm，激光功率为1600 W。也就是说，通过激光熔覆，成功地获得了高质量的FeAl50CrNi复合涂层，该涂层经过良好的熔化、混合、熔接，然后以冶金方式可靠地结合在AA7075板表面上，几乎没有熔覆缺陷。与AA7075基板相比，激光熔覆高质量FeAl50CrNi复合镀层的耐磨性和耐腐蚀性在适当的激光功率为1600 W时得到了有效的提高。在半小时内，最大显微硬度提高了116.67%，平均摩擦系数降低了31.43%，磨损损失降低了77.66%，腐蚀电流密度降低了31.23%。结果表明，由于有效能量输入、激光影响、加热-冷却速率和元素扩散等方面的显著变化，从涂层顶部到激光熔覆区内的微观结构特征发生了显著变化。有趣的是，这些内部组织变化主要表现为分散分布的针状Fe-Al金属间化合物（涂层顶部），分散分布的微小第二相颗粒（涂层中部）和细小的等轴和柱状晶粒（熔合区）。重要的是，这些微观结构特征使涂层在强度、延展性和韧性、显微硬度、耐磨性和耐腐蚀性等方面具有良好的综合力学性能。

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引用次数: 0

Radiation Physics commissioning of LCLS-II superconducting Linac. Gun and cryomodules commissioning LCLS-II超导直线加速器的辐射物理调试。枪和低温模块调试

IF 1.4 3区物理与天体物理 Q3 INSTRUMENTS & INSTRUMENTATION

Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment

Pub Date : 2026-06-01 Epub Date: 2026-01-31 DOI: 10.1016/j.nima.2026.171340

T. Frosio , J. Allan , J. Blaha , H. Brogognia , S. Rokny , M. Santana Leitner , S. Aderhold , M. Bai , S. Littleton

The Linac Coherent Light Source II (LCLS-II) at SLAC is a X-ray free-electron laser based on a 4 GeV superconducting linear accelerator capable of continuous-wave operation. While the machine has not yet reached its full design power, an initial phase of commissioning has focused on characterizing radiation produced by field emission, unintended electron discharge from RF cavities, which can impact beam quality, cause component damage, and create radiation hazards.

Using in situ diagnostics from the radiation safety system, including ionization chambers, synthetic diamond detectors, and Cherenkov fibers, we investigated field emissions originating from both the laser gun and cryomodules. For the gun, we characterized the captured current at the cathode and quantified the transmitted dark current through the beamline. By applying a dedicated methodology involving downstream collimators, we showed that a large fraction of the dark current can be intercepted by the collimation system.

For the cryomodules, we used radiation monitors and FLUKA simulations to estimate captured current and its evolution over time. Radiation was observed in several cavities, with field emission detected at gradients as low as 8 MV/m. Detailed analysis of some individual cryomodules revealed trends in backward and forward emission, enabling us to identify specific cavities contributing most to field-emitted current. These results support further mitigation strategies and provide a transferable approach to characterizing field emission in superconducting linacs.

SLAC的直线加速器相干光源II （LCLS-II）是一种基于4 GeV超导直线加速器的x射线自由电子激光器，具有连续波工作能力。虽然机器尚未达到其全部设计功率，但调试的初始阶段侧重于表征场发射产生的辐射，射频腔的意外电子放电会影响光束质量，导致组件损坏并产生辐射危害。利用辐射安全系统（包括电离室、合成金刚石探测器和切伦科夫光纤）的现场诊断，我们研究了激光枪和低温模组的场发射。对于枪，我们表征了阴极处捕获的电流，并量化了通过光束线传输的暗电流。通过应用涉及下游准直器的专用方法，我们表明准直系统可以拦截很大一部分暗电流。对于低温模块，我们使用辐射监测仪和FLUKA模拟来估计捕获的电流及其随时间的演变。在几个空腔中观察到辐射，在低至8 MV/m的梯度下检测到场发射。对个别低温模块的详细分析揭示了向后和正向发射的趋势，使我们能够确定对场发射电流贡献最大的特定空腔。这些结果支持了进一步的缓解策略，并提供了一种可转移的方法来表征超导直线加速器中的场发射。

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引用次数: 0

Design, waterproofing, and mass production of the 3-inch PMT frontend system of JUNO JUNO 3英寸PMT前端系统的设计、防水、量产

IF 1.4 3区物理与天体物理 Q3 INSTRUMENTS & INSTRUMENTATION

Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment

Pub Date : 2026-06-01 Epub Date: 2026-02-10 DOI: 10.1016/j.nima.2026.171301

Jilei Xu , Miao He , Cédric Cerna , Yongbo Huang , Thomas Adam , Shakeel Ahmad , Rizwan Ahmed , Fengpeng An , Costas Andreopoulos , Giuseppe Andronico , João Pedro Athayde Marcondes de André , Nikolay Anfimov , Vito Antonelli , Tatiana Antoshkina , Didier Auguste , Weidong Bai , Nikita Balashov , Andrea Barresi , Davide Basilico , Eric Baussan , Jiaheng Zou

Over 25,600 3-inch photomultiplier tubes (PMTs) have been instrumented for the central detector of the Jiangmen Underground Neutrino Observatory. Each PMT is equipped with a high-voltage divider and a frontend cable with waterproof sealing. Groups of sixteen PMTs are connected to the underwater frontend readout electronics via specialized multi-channel waterproof connectors. This paper outlines the design and mass production processes for the high-voltage divider, the cable and connector, as well as the waterproof potting of the PMT bases. The results of the acceptance tests of all the integrated PMTs are also presented.

江门地下中微子天文台的中央探测器已经安装了25,600多个3英寸光电倍增管（pmt）。每个PMT配备一个高压分压器和一个前端电缆防水密封。16组pmt通过专门的多通道防水连接器连接到水下前端读出电子设备。本文概述了高压分压器、电缆和连接器的设计和批量生产过程，以及PMT底座的防水灌封。文中还介绍了所有集成pmt的验收测试结果。

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引用次数: 0

The AMS-02 RICH detector: Status, latest results, and physics prospects AMS-02 RICH探测器：现状、最新结果和物理前景

IF 1.4 3区物理与天体物理 Q3 INSTRUMENTS & INSTRUMENTATION

Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment

Pub Date : 2026-06-01 Epub Date: 2026-02-05 DOI: 10.1016/j.nima.2026.171364

Jianan Xiao , Bowen Huang , Hai Chen , Francesca Giovacchini , Carlos Delgado , Jorge Casaus , AMS Collaboration

Since 2011, the Alpha Magnetic Spectrometer (AMS-02) has been conducting precision measurement of cosmic-ray fluxes on the International Space Station. Central to its isotope identification capability is the Ring Imaging Cherenkov Detector (RICH), which determines particle velocity and charge with high accuracy. In this paper, we present the status and performance of the RICH detector after more than 14 years of operation in space. The alignment and calibration on the refractive index of aerogel radiators are cross checked with precision. Furthermore, a new velocity reconstruction algorithm based on the Maximum Likelihood Estimation is introduced, which achieves velocity resolution of

5.1 \times 1 0^{- 4}

for lithium and

4.0 \times 1 0^{- 4}

for beryllium. These calibration and reconstruction advancements are critical for the high-precision future analysis of light isotopes, which provide essential constraints on the cosmic-ray propagation models.

自2011年以来，阿尔法磁谱仪（AMS-02）一直在国际空间站上对宇宙射线通量进行精确测量。其同位素识别能力的核心是环形成像切伦科夫探测器（RICH），它可以高精度地确定粒子速度和电荷。本文介绍了RICH探测器在太空运行14年后的现状和性能。对气凝胶散热器折射率的对准和标定进行了精确的交叉检验。在此基础上，提出了一种基于极大似然估计的速度重建算法，实现了锂的速度分辨率为5.1×10−4，铍的速度分辨率为4.0×10−4。这些校准和重建的进展对于未来光同位素的高精度分析至关重要，这为宇宙射线传播模型提供了必要的约束。

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引用次数: 0

Probing quantum gravity in stellar spacetimes: Phenomenological insights 探索恒星时空中的量子引力：现象学见解

IF 6.4 2区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Physics of the Dark Universe

Pub Date : 2026-06-01 Epub Date: 2026-02-04 DOI: 10.1016/j.dark.2026.102243

Reggie C. Pantig , Ali Övgün , Gaetano Lambiase

We explore the weak-field phenomenology of a compact star spacetime modified by quantum gravitational corrections derived from the effective field theoretical (EFT) approach by Calmet et al. [1]. These corrections, encoded in non-local curvature-squared terms, distinguish matter-supported geometries from vacuum solutions by contributing nontrivial modifications at order O(G²). Using the corrected metric, we analytically derive expressions for the deflection of light and time-like particles via the Gauss-Bonnet theorem. We further compute the perihelion advance of Mercury, Shapiro time delay, and gravitational redshift within this framework. Each classical observable acquires quantum corrections that, though exceedingly small (on the order of

10^{- 9}

arcsecond per century for perihelion precession and

10^{- 18}

arcsecond for light deflection) represent potential imprints of quantum gravity. The Shapiro delay and redshift likewise exhibit finite, source-dependent deviations from their general relativistic predictions due to the modified temporal metric component. While current observational capabilities remain insufficient to detect these minute effects, the analysis demonstrates that quantum gravitational signatures are embedded even in weak-field observables. Last, we study massless scalar perturbations in static, spherically symmetric spacetimes by analyzing their quasinormal modes (QNMs) and greybody factors using the WKB method and Pade resummation. Our findings demonstrate that increasing the coupling parameter enhances spacetime stability and significantly influences emission spectra through frequency-dependent transparency. Moreover, the results underscore that quantum-corrected star metrics yield phenomenological distinctions from classical black holes, particularly near the Planck scale, where vacuum solutions lose validity.

我们探索了由Calmet等人的有效场论（EFT）方法导出的量子引力修正的致密恒星时空的弱场现象学。这些修正以非局部曲率平方项编码，通过贡献O（G2）阶的非平凡修正，将物质支持的几何与真空解区分开来。利用修正度规，我们通过高斯-博内定理解析导出了光和类时粒子偏转的表达式。在此框架下，我们进一步计算了水星的近日点推进、夏皮罗时间延迟和引力红移。每一个经典观测都获得了量子修正，尽管非常小（近日点进动每世纪10−9角秒，光偏转10−18角秒），但它们代表了量子引力的潜在印记。夏皮罗延迟和红移同样表现出有限的、依赖于源的偏离，因为它们的广义相对论预测是由修改的时间度量分量造成的。虽然目前的观测能力还不足以探测到这些微小的效应，但分析表明，即使在弱场观测中，量子引力特征也存在。最后，我们利用WKB方法和Pade恢复分析了静球对称时空中的准正态模态和灰体因子，研究了静球对称时空中的无质量标量扰动。我们的研究结果表明，增加耦合参数可以提高时空稳定性，并通过频率依赖的透明度显著影响发射光谱。此外，结果强调，量子校正的恒星度量产生了与经典黑洞的现象学区别，特别是在普朗克尺度附近，真空解在那里失去了有效性。

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引用次数: 0

Machine learning-based enhanced visibility framework and predictive fog- and precipitation-induced attenuation modeling of subtropical free-space optical communication links 基于机器学习的增强可见度框架和亚热带自由空间光通信链路雾降水衰减预测模型

IF 2.5 3区物理与天体物理 Q2 OPTICS

Optics Communications

Pub Date : 2026-06-01 Epub Date: 2026-01-09 DOI: 10.1016/j.optcom.2026.132897

Okikiade Adewale Layioye , Pius Adewale Owolawi , Chunling Tu , Etienne Van Wyk , Joseph Sunday Ojo

Free-Space Optical (FSO) communication offers a powerful solution for high-speed and long-distance data transmission, but the quality of the performance is critically dependent on atmospheric conditions. This paper presents a comprehensive, data-driven framework for characterizing and predicting atmospheric attenuation from fog and rain for FSO links. Our analysis reveals a distinct non-Gaussian distribution for attenuation, with a small number of severe fog events dominating link degradation. The mean total attenuation for all cities is significantly higher with maximum values reaching over 170 dB/km, whereas rain attenuation peaks below 4 dB/km. A link budget analysis with a 26.6 dB fade margin demonstrates that for this configuration, rain is a negligible factor, with fog being the sole contributor to link outage. To address the challenge of real-time link management, a Random Forest (RF) regressor technique was trained to predict total attenuation from visibility and rain data. A systematic dual-split modeling approach (chronological time-forward splits and random shuffled splits) was employed to provide a comprehensive performance evaluation and to assess the RF model's performance both under general, independent and identically distributed assumptions and under realistic time-series forecasting conditions. The shuffled-split models, trained on a random mix of data, achieved a near-perfect coefficient of determination (

R^{2}

>0.9997) and very low root mean square error (RMSE ≈ 0.0300 dB/km) for most cities, confirming the model's fundamental ability to learn the underlying relationships. Feature importance analysis revealed visibility as the overwhelmingly dominant predictor, accounting for over 99 % of the model's predictive power. This work demonstrates that the proposed framework, augmented by machine learning, is a versatile and reliable tool for preliminary site assessment, link-outage probability calculation, and real-time link margin management in FSO networks. The findings provide a critical foundation for the deployment of FSO infrastructure in the climatically diverse South African landscape.

自由空间光学（FSO）通信为高速和远距离数据传输提供了强大的解决方案，但性能的质量严重依赖于大气条件。本文提出了一个全面的、数据驱动的框架，用于表征和预测FSO链路中雾和雨的大气衰减。我们的分析揭示了衰减的明显非高斯分布，少数严重雾事件主导了链路退化。所有城市的平均总衰减都显著较高，最大值可达170 dB/km以上，而降雨衰减峰值在4 dB/km以下。具有26.6 dB衰减裕度的链路预算分析表明，对于这种配置，雨是一个可以忽略不计的因素，雾是导致链路中断的唯一因素。为了解决实时链路管理的挑战，训练随机森林（RF）回归器技术来预测能见度和降雨数据的总衰减。采用系统的双分裂建模方法（按时间顺序向前分裂和随机打乱分裂）进行综合性能评估，并评估了RF模型在一般、独立和同分布假设以及实际时间序列预测条件下的性能。在随机混合数据上训练的打乱分割模型，对大多数城市实现了接近完美的决定系数（R2 >0.9997）和非常低的均方根误差（RMSE≈0.0300 dB/km），证实了该模型学习潜在关系的基本能力。特征重要性分析显示，可见性是压倒性的主要预测因素，占模型预测能力的99%以上。这项工作表明，所提出的框架，通过机器学习的增强，是FSO网络中初步站点评估、链路中断概率计算和实时链路余量管理的通用可靠工具。这一发现为在气候多样化的南非地区部署FSO基础设施提供了重要的基础。

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引用次数: 0

High-performance humidity and pressure sensor based on STMS fiber structure coated with Ca-alginate hydrogel 基于海藻酸钙水凝胶包覆STMS纤维结构的高性能温湿度传感器

IF 5 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2026-06-01 Epub Date: 2026-02-05 DOI: 10.1016/j.optlastec.2026.114820

Jiachen Guo , Benyu Zhang , Zhifang Xu , Lina Bi , Shuang Li , Yueyan Shi , Liang Zhou , Shiqing Zhou , Jiaqi Zhang

This work presents an experimental demonstration of a high-sensitivity optical fiber sensor based on a calcium alginate (CaAlg)-functionalized single mode–tapered multimode–single mode (STMS) structure for humidity and pressure monitoring. By employing a tapered multimode fiber (TMF) to enhance the interaction with the evanescent field and integrating a biocompatible CaAlg film with excellent hygroscopic properties, the sensor achieves high sensitivity for detecting both humidity and pressure. The sensor demonstrates a humidity sensitivity of 0.315 dBm/%RH in optical power and 0.225 nm/%RH in wavelength shift over the 30 %–70 % RH range, with response and recovery times of 0.42 s and 0.2 s, respectively. For pressure sensing, the sensor exhibits an ultra-high sensitivity of 91.48 dBm/kPa within the 0–0.25 kPa range. Additionally, the sensor was tested at 50 % and 70 % RH for 120 min, with standard deviations of 0.2622 and 0.6327, respectively. The relative error at most only 0.0067 indicating the sensor’s high repeatability and reliability. The fabrication process is simple, environmentally friendly, and suitable for health monitoring applications. This work presents a promising approach for the development of multifunctional, miniaturized, and high-resolution fiber-optic sensors, with potential applications in wearable devices, healthcare monitoring, and soft robotics.

本文提出了一种基于海藻酸钙（CaAlg）功能化单模-锥形多模-单模（STMS）结构的高灵敏度光纤传感器的实验演示，用于湿度和压力监测。通过采用锥形多模光纤（TMF）增强与倏逝场的相互作用，并集成具有优异吸湿性能的生物相容性CaAlg薄膜，该传感器实现了对湿度和压力的高灵敏度检测。在30% ~ 70% RH范围内，该传感器的光功率和波长位移的湿度灵敏度分别为0.315 dBm/%RH和0.225 nm/%RH，响应时间和恢复时间分别为0.42 s和0.2 s。压力传感器在0 ~ 0.25 kPa范围内具有91.48 dBm/kPa的超高灵敏度。此外，传感器在50%和70% RH下测试120分钟，标准偏差分别为0.2622和0.6327。相对误差最高仅为0.0067，表明该传感器具有较高的重复性和可靠性。制造过程简单，环保，适合健康监测应用。这项工作为开发多功能、小型化和高分辨率光纤传感器提供了一种有前途的方法，在可穿戴设备、医疗监测和软机器人中具有潜在的应用前景。

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引用次数: 0

Demonstration of 1.5-kW large-core step-index Yb-doped fiber amplifier near 980 nm 980 nm附近1.5 kw大芯阶跃折射率掺镱光纤放大器的演示

IF 2.5 3区物理与天体物理 Q2 OPTICS

Optics Communications

Pub Date : 2026-06-01 Epub Date: 2026-01-27 DOI: 10.1016/j.optcom.2026.132966

Maoni Chen , Aimin Liu , Shangde Zhou , Jianqiu Cao , Qi Zhang , Zhihe Huang , Zilun Chen , Zefeng Wang , Jinbao Chen

A 1.5-kW large-core step-index Yb-doped fiber amplifier operating near 980 nm is firstly demonstrated, to the best of our knowledge, by means of broadening the signal bandwidth to suppress in-band amplified spontaneous emission (ASE) around 980 nm. The signal bandwidth covering from 974 nm to 980 nm is achieved using a home-made seed oscillator with a dual low-reflectivity fiber Bragg grating (LR-FBG) configuration. The record 1.546-kW output power was achieved with a slope efficiency of 71.5 % (with respect to the launched pump power) which should also be the highest achieved by the step-index double-cladding Yb-doped fiber. The power ratio of in-band ASE was suppressed to below 1 %, while the ASE around 1030 nm was also 27.8-dB suppressed. This amplifier can strongly drive the power up-scaling of high-power fiber lasers and amplifiers as high-power cladding-pumping source, and thus can have significant impact on application fields involving high-power fiber lasers and amplifiers.

据我们所知，首先展示了一个工作在980 nm附近的1.5 kw大芯阶跃折射率掺镱光纤放大器，通过扩大信号带宽来抑制980 nm附近的带内放大自发发射（ASE）。采用自制的双低反射率光纤布拉格光栅（LR-FBG）结构的种子振荡器实现了974 ~ 980 nm的信号带宽。以71.5%的斜率效率（相对于发射的泵浦功率）实现了创纪录的1.546 kw输出功率，这也应该是由阶跃折射率双包层掺镱光纤实现的最高输出功率。带内ASE的功率比被抑制在1%以下，而1030 nm附近的ASE也被抑制了27.8 db。该放大器作为高功率包层泵浦源，能够有力地推动高功率光纤激光器和放大器的功率放大，从而对高功率光纤激光器和放大器的应用领域产生重要影响。

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引用次数: 0

Selective multichannel excitation of Olver surface plasmon polaritons in composite nanoarray structures 复合纳米阵列结构中Olver表面等离子激元的选择性多通道激发

IF 2.5 3区物理与天体物理 Q2 OPTICS

Optics Communications

Pub Date : 2026-06-01 Epub Date: 2026-01-23 DOI: 10.1016/j.optcom.2026.132907

Xuefeng Shi , Peng Lang , Boyu Ji , Zhenlong Zhao , Yang Xu , Xiaowei Song , Jingquan Lin

Non-diffracting Olver surface plasmon polaritons (SPPs) exhibit unique characteristics of anti-disturbance and self-bending propagation, effectively reducing diffraction loss and extend the propagation distance of the main lobe. In this work, we design a polarization- and wavelength-sensitive composite nanoarray structure that enables flexible and active control of the excitation and bending direction of the Olver SPP main lobe in four distinct directions. Specifically, changing the polarization state of the incident light enables tuning the directional excitation of the Olver SPP main lobe, while varying the incident wavelength allows the precise control of its excitation direction along the upper or lower part of the structure. Quantitative analysis based on the extinction ratio demonstrates the excellent directional excitation capability of the proposed structure. Furthermore, the diffraction-free and self-healing properties of Olver SPPs are verified through the extraction of amplitude distribution curves along their propagation trajectories with the introduction of obstacles. These findings provide a promising strategy for advancing applications in optical tweezers, information routing, and plasmonic functional devices.

无衍射Olver表面等离子激元（SPPs）具有独特的抗干扰和自弯曲传播特性，有效地降低了衍射损耗，延长了主瓣的传播距离。在这项工作中，我们设计了一种极化和波长敏感的复合纳米阵列结构，可以灵活主动地控制Olver SPP主瓣在四个不同方向上的激发和弯曲方向。具体来说，改变入射光的偏振状态可以调整Olver SPP主瓣的定向激发，而改变入射波长可以精确控制其沿结构上部或下部的激发方向。基于消光比的定量分析表明，该结构具有良好的定向激励能力。此外，通过提取在引入障碍物时沿其传播轨迹的振幅分布曲线，验证了Olver SPPs的无衍射和自愈特性。这些发现为推进光镊、信息路由和等离子体功能器件的应用提供了一个有前途的策略。

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引用次数: 0

Key design features of the southern advanced photon source 南方先进光子源的关键设计特点

IF 1.4 3区物理与天体物理 Q3 INSTRUMENTS & INSTRUMENTATION

Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment

Pub Date : 2026-06-01 Epub Date: 2026-01-24 DOI: 10.1016/j.nima.2026.171310

Yu Zhao , Jianliang Chen , Weihang Liu , Zhiping Li , Liangsheng Huang , Yanliang Han , Xingguang Liu , Shimin Jiang , Xiao Li , Yi Jiao , Sheng Wang

The Southern Advanced Photon Source (SAPS), a new 3.5 GeV ultra-low emittance ring-based light source, is planned to be built adjacent to the China Spallation Neutron Source in Dongguan. The SAPS project features a low-energy Linac and a booster serving as the pre-injector, and a storage ring design based on hybrid seven-bend achromat (H-7BA) with a circumference of 810 m. To achieve exceptional performance in terms of low emittance and high brightness, a novel unit cell, which consists of a bend combined with horizontal and longitudinal gradient (TLGB) in the center and two reverse bends neighboring the TLGB, is proposed to be used in the H-7BA. This innovative approach allows for a remarkable low natural emittance of 26.3 pm rad and a high brightness exceeding

1 \times 1 0^{22}

photons/s/mm²/mrad²/0.1% BW at a photon energy of about 4 keV. Furthermore, the optimized dynamic aperture and momentum aperture, even in the presence of realistic error conditions, satisfy the requirements for on-axis longitudinal injection, enabling beam accumulation. In this paper, details about lattice design and optimization, optics correction, injection scheme, collective effects and pre-injector design are presented.

南方先进光子源（SAPS）是一个新的3.5 GeV超低发射环状光源，计划在东莞中国散裂中子源附近建造。SAPS项目采用低能直线加速器和助推器作为预注入器，以及基于混合七弯消色差（H-7BA）的储存环设计，周长为810米。为了在低发射度和高亮度方面获得优异的性能，提出了一种新型的单元电池，该单元电池由中心的一个结合水平和纵向梯度（TLGB）的弯曲和TLGB附近的两个反向弯曲组成。这种创新的方法允许在光子能量约为4 keV时具有26.3 pm rad的显着低自然发射率和超过1×1022光子/s/mm2/mrad2/0.1% BW的高亮度。此外，优化后的动态孔径和动量孔径，即使在实际误差条件下，也能满足轴向纵向注射的要求，实现光束积累。本文详细介绍了晶格设计和优化、光学校正、注入方案、集体效应和预注入器设计。

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