物理与天体物理最新文献_第2页

The role of windows in sonic boom indoor transmission 窗在音爆室内传播中的作用

IF 3.4 2区物理与天体物理

Applied Acoustics Pub Date : 2025-05-05 DOI: 10.1016/j.apacoust.2025.110746

A.A. Valishina, L.R. Gareev, K.A. Zhidyaev, V.V. Vedeneev

引用次数: 0

Single-Mode Emission by Phase-Delayed Coupling Between Nanolasers 纳米激光器之间的相位延迟耦合单模发射

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2025-05-05 DOI: 10.1021/acsphotonics.4c01230

T. V. Raziman, Anna Fischer, Riccardo Nori, Anthony Chan, Wai Kit Ng, Dhruv Saxena, Ortwin Hess, Korneel Molkens, Ivo Tanghe, Pieter Geiregat, Dries Van Thourhout, Mauricio Barahona, Riccardo Sapienza

{"title":"Single-Mode Emission by Phase-Delayed Coupling Between Nanolasers","authors":"T. V. Raziman, Anna Fischer, Riccardo Nori, Anthony Chan, Wai Kit Ng, Dhruv Saxena, Ortwin Hess, Korneel Molkens, Ivo Tanghe, Pieter Geiregat, Dries Van Thourhout, Mauricio Barahona, Riccardo Sapienza","doi":"10.1021/acsphotonics.4c01230","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c01230","url":null,"abstract":"Near-field coupling between nanolasers enables collective high-power lasing but leads to complex spectral reshaping and multimode operation, limiting the emission brightness, spatial coherence, and temporal stability. Many lasing architectures have been proposed to circumvent this limitation based on symmetries, topology, or interference. We show that a much simpler and robust method exploiting phase-delayed coupling, where light exchanged by the lasers carries a phase, can enable stable single-mode operation. Phase-delayed coupling changes the modal amplification: for pump powers close to the anyonic parity-time (PT) symmetric exceptional point, a high phase delay completely separates the mode thresholds, leading to single-mode operation. This is shown by stability analysis with nonlinear coupled mode theory and stochastic differential equations for two coupled nanolasers and confirmed by a realistic semianalytical treatment of a dimer of lasing nanospheres. Finally, we extend the mode control to large arrays of nanolasers featuring lowered thresholds and higher power. Our work promises a novel solution to engineer bright and stable single-mode lasing from nanolaser arrays with important applications in photonic chips for communication and LIDAR.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"19 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143905561","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Atmospheric pollution derived from PM2.5 particles produced in fireworks burning events in Mexico City 墨西哥城燃放烟花活动产生的PM2.5颗粒造成的大气污染

IF 1.4 3区物理与天体物理

Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms Pub Date : 2025-05-05 DOI: 10.1016/j.nimb.2025.165699

Francisca Aldape , Javier Flores-Maldonado , Javier Flores-Aldape , Olivia Rivera-Hernández

{"title":"Atmospheric pollution derived from PM2.5 particles produced in fireworks burning events in Mexico City","authors":"Francisca Aldape , Javier Flores-Maldonado , Javier Flores-Aldape , Olivia Rivera-Hernández","doi":"10.1016/j.nimb.2025.165699","DOIUrl":"10.1016/j.nimb.2025.165699","url":null,"abstract":"<div><div>Fireworks (FW) burnings have attracted the attention of the scientific community because of the potential risks they pose to the environment and human health. In the Mexico City Metropolitan Area (MCMA) and in its surroundings, FW burnings are displayed during local celebrations, depositing large amounts of smoke and fine particles into the atmosphere. That is the case of Christmas and New Year’s Eve celebrations, when FW are sequentially displayed in many countries around the world according to their time zones, causing a global effect. In this study, PM<sub>2.5</sub> samples were collected simultaneously from seven strategic sampling sites in the MCMA during Christmas and New Year’s Eve from 2005 to 2010, when FW burning events occurred, and most of the mass concentrations exceeded by a factor of 2–3 times the Mexican Air Quality Standard (NOM) of 65 μg/m<sup>3</sup> in 24 h (value level at the time of sampling). A set of 77 samples were analyzed by Particle induced X-ray emission (PIXE) to determine their elemental concentrations. Fifteen elements (S, Cl, K, Ca, Ti, V, Cr, Mn, Fe, Cu, Zn, As, Br, Ba, Pb) were identified in the samples, six of them (Cl, K, Ca, Cr, Cu, Ba) with high concentrations in comparison to samples collected during normal days, when no pyrotechnics were displayed. Ba was found with very high concentrations during these events in comparison with ordinary days, when it barely reached its minimum detection limit. So, it was recognized as the best FW tracer for this study. Several pairs of elements showed good correlations in most of the years under study, which allowed us to infer the presence of some characteristic chemical compounds of the gunpowder used locally.</div></div>","PeriodicalId":19380,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms","volume":"564 ","pages":"Article 165699"},"PeriodicalIF":1.4,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143903922","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Remarks on the (mathbb {Z}/p) Dijkgraaf-Witten Invariants of 3D Mapping Tori 三维映射环面的(mathbb {Z}/p) Dijkgraaf-Witten不变量的注释

IF 2.2 1区物理与天体物理

Communications in Mathematical Physics Pub Date : 2025-05-05 DOI: 10.1007/s00220-025-05279-5

William Chen, Alex Kontorovich, Shehryar Sikander

引用次数: 0

Broadband Quantum-Junction Photodiode Achieving Ultralow-Noise Light Sensing 宽带量子结光电二极管实现超低噪声光传感

IF 11 1区物理与天体物理

Laser & Photonics Reviews Pub Date : 2025-05-05 DOI: 10.1002/lpor.202500342

Hao Li, Xiaochen Guo, Yinglin Wang, Chao Wang, Xintong Zhang, Yichun Liu

{"title":"Broadband Quantum-Junction Photodiode Achieving Ultralow-Noise Light Sensing","authors":"Hao Li, Xiaochen Guo, Yinglin Wang, Chao Wang, Xintong Zhang, Yichun Liu","doi":"10.1002/lpor.202500342","DOIUrl":"https://doi.org/10.1002/lpor.202500342","url":null,"abstract":"Low-noise photodetectors hold immense promise for advancing weak-light sensing in cutting-edge applications such as health monitoring, intelligent driving, and military surveillance. Quantum-junction photodiode (QJPD), composed solely of light-absorbing quantum dots, are highly expected to overcome the noise limitation of conventional narrow-bandgap semiconductor photodetectors due to their inherent advantages of low hot carrier density as well as weak inter-dot electronic coupling. However, the targeted device engineering of QJPD remains a critical exploration area to fully unlock their low-noise potential. Here, a low-noise, broadband QJPD is proposed through the strategic incorporation of an ultrathin ALD SnO<sub>x</sub> layer. This SnO<sub>x</sub> modification efficiently suppresses the interfacial barrier, reduces the interface resistance and minimizes dark current of QJPDs. Consequently, SnO<sub>x</sub>-modified QJPDs achieve an ultralow noise current of 4.85 × 10<sup>−14</sup> A Hz⁻<sup>1/2</sup> and a specific detectivity exceeding 10<sup>12</sup> Jones across a broad spectral range (350−1050 nm), significantly outperforming unmodified QJPDs (≈10<sup>10</sup> Jones) and other n-i-p quantum dot photodetectors (≈10<sup>9</sup> Jones). SnO<sub>x</sub>-modified QJPDs enable high-accuracy blood oxygen saturation measurements using near-infrared light and real-time heartbeat monitoring under weak ambient light conditions. This work establishes a foundation for the development of low-noise QJPDs, underscoring their potential for weak-light detection in challenging environments with strong hindering and ambient light.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"28 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143905631","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Determination of inelastic mean free path for solid polymer electrolytes: PTMC:LiBOB and PCL:LiBOB 固体聚合物电解质PTMC:LiBOB和PCL:LiBOB非弹性平均自由程的测定

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2025-05-05 DOI: 10.1063/5.0254600

Yi-Chen Weng, Henry Nameirakpam, Edvin K. W. Andersson, Elin Cartwright, M. Venkata Kamalakar, Maria Hahlin, Andreas Lindblad

引用次数: 0

Prediction and Application of Critical Current in 2G HTS Conductors Based on GA-BP Algorithm 基于GA-BP算法的2G高温超导导体临界电流预测及应用

IF 1.6 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2025-05-05 DOI: 10.1007/s10948-025-06975-y

Nipeng Wang, Wenhai Zhou, Rui Liang, Rongli Jia, Bingxu Su, Tingliang Chen, Leiwen Yue, Jiafeng Cao

{"title":"Prediction and Application of Critical Current in 2G HTS Conductors Based on GA-BP Algorithm","authors":"Nipeng Wang, Wenhai Zhou, Rui Liang, Rongli Jia, Bingxu Su, Tingliang Chen, Leiwen Yue, Jiafeng Cao","doi":"10.1007/s10948-025-06975-y","DOIUrl":"10.1007/s10948-025-06975-y","url":null,"abstract":"<div><p>Critical current, as a key parameter distinguishing superconductors from ordinary conductors, determines the stability of superconducting devices and systems during operation. To accurately assess the critical performance of superconductors, a genetic algorithm (GA)–optimized back-propagation (BP) neural network model is introduced and used in this paper to predict the critical currents of second-generation high-temperature superconductors (2G HTS). Firstly, a staged optimization is carried out for the neural network structure and hyper-parameters, and the GA-BP model is established by constructing different fitness functions. Next, the prediction accuracy and generalization ability of the GA-BP model are validated by comparing the relative errors between the predicted values from two models in the 180° to 240° anti-angle region. Eventually, the critical current at a specific temperature is predicted by the GA-BP model, and the corresponding <i>J</i><sub><i>c</i>0</sub> is calculated for the finite element calculation of superconducting strips. The calculation results show that the relative error between the maximum current density obtained based on the predicted <i>J</i><sub><i>c</i>0</sub> and the experimental <i>J</i><sub><i>c</i>0</sub> is only 0.907%, indicating that the model can be used to accurately determine the operating state of the superconducting equipment.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 3","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143904851","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ultra-broadband incoherent sources based on laser-sustained plasma 基于激光持续等离子体的超宽带非相干光源

IF 4.6 2区物理与天体物理

Optics and Laser Technology Pub Date : 2025-05-05 DOI: 10.1016/j.optlastec.2025.113098

He Hu , Shichao Yang , Zhaojiang Shi , Xia Yu

{"title":"Ultra-broadband incoherent sources based on laser-sustained plasma","authors":"He Hu , Shichao Yang , Zhaojiang Shi , Xia Yu","doi":"10.1016/j.optlastec.2025.113098","DOIUrl":"10.1016/j.optlastec.2025.113098","url":null,"abstract":"<div><div>Laser-sustained plasma (LSP) featured by intense radiation in the ultra-broadband spectral range from vacuum ultraviolet to mid infrared, has attracted general interest in high resolution imaging, spectroscopy, and precision inspection. As high power fiber lasers have advanced in recent years, LSP-based techniques for broadband incoherent sources have emerged. However, despite numerous research efforts over the decades, there is still a lack of a comprehensive review of the influence of both gas parameters and laser parameters on LSP and their underlying mechanism. In this review, we summarized the state-of-the-art research results based on LSP techniques. Starting from the physical processes of absorption and radiation, key characteristics of LSP have been analyzed by considering critical parameters including plasma density, laser absorption coefficient and radiation coefficient. Subsequently, the effect of laser parameters on LSP characteristics and the possible mechanism are analyzed in detail. Moreover, the optical diagnostics methodologies of these parameters are compared and evaluated. Essential applications of LSP technology as a light source, in material processing and laser propulsion are summarized. Finally, we discuss the existing problems, possible solutions and future research outlook of LSP technology.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"189 ","pages":"Article 113098"},"PeriodicalIF":4.6,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143904184","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Does the Meissner effect require radial charge flow? 迈斯纳效应需要径向电荷流吗？

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2025-05-05 DOI: 10.1016/j.physc.2025.1354724

J.E. Hirsch

引用次数: 0

Quasi-Bound States in the Continuum on Dislocated Bilayer Metal Gratings for Spatiotemporal Vortex Pulse Generation (Laser Photonics Rev. 19(9)/2025) 位错双层金属光栅时空涡脉冲产生的准束缚态（激光光子学，19(9)/2025）

IF 9.8 1区物理与天体物理

Laser & Photonics Reviews Pub Date : 2025-05-05 DOI: 10.1002/lpor.202570034

Yi Zhou, Renwei Zou, Junjie Zhan, Yubo Wang, Daoxin Dai, Pankaj K. Choudhury, Andrew Forbes, Yungui Ma

引用次数: 0