Applied Physics B最新文献_第8页

Numerical and experimental investigation of surface figure error in high-repetition-rate XFEL mirrors 高重复率XFEL反射镜表面图形误差的数值与实验研究

IF 2 3区物理与天体物理

Applied Physics B Pub Date : 2025-11-29 DOI: 10.1007/s00340-025-08607-8

Zhen Wang, Weizhen Lei, Xiaohao Dong, Yajun Tong

引用次数: 0

Second harmonic generation of circularly polarized Hermite-cosh Gaussian laser beam in magnetized plasma 圆极化厄米-柯希高斯激光束在磁化等离子体中的二次谐波产生

IF 2 3区物理与天体物理

Applied Physics B Pub Date : 2025-11-29 DOI: 10.1007/s00340-025-08605-w

Danish Nazir, Vishal Thakur

{"title":"Second harmonic generation of circularly polarized Hermite-cosh Gaussian laser beam in magnetized plasma","authors":"Danish Nazir, Vishal Thakur","doi":"10.1007/s00340-025-08605-w","DOIUrl":"10.1007/s00340-025-08605-w","url":null,"abstract":"<div><p>This work examines the second harmonic generation of a Hermite-cosh-Gaussian (HChG) laser beam with circular polarisation in a magnetised plasma. In order to explain relativistic electron motion and the distinctive transverse structure of the Hermite-cosh-Gaussian beam, it is assumed that the nonlinear current density is the cause of second harmonic generation. By using the paraxial approximation, analytical formulas for the second harmonic field amplitude are derived, reflecting dependencies on plasma density and beam characteristics (mode indices, intensity, and beam width). The wiggler magnetic field enhances the phase-matching conditions to permit resonant SHG by giving the second-harmonic photons some more velocity. Furthermore, the wiggler field will contribute to the maintenance of the cyclotron frequency, which confines the plasma electrons and increases SHG efficiency. While the HChG profile delivers mode-selective gain in SHG efficiency, circular polarisation improves azimuthal symmetry in the nonlinear current. The findings demonstrate how structured beams may be used to generate high-harmonics in laser-plasma interactions in a customised manner.</p></div>","PeriodicalId":474,"journal":{"name":"Applied Physics B","volume":"131 12","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145613054","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

Topological exciton dynamics in strain-engineered lead halide perovskite quantum dots 应变工程卤化铅钙钛矿量子点的拓扑激子动力学

IF 2 3区物理与天体物理

Applied Physics B Pub Date : 2025-11-28 DOI: 10.1007/s00340-025-08600-1

Moses Udoisoh, Kabir Kehinde Adedeji, Salihu Ahmad, oluwatife Daniel Olaleye

{"title":"Topological exciton dynamics in strain-engineered lead halide perovskite quantum dots","authors":"Moses Udoisoh, Kabir Kehinde Adedeji, Salihu Ahmad, oluwatife Daniel Olaleye","doi":"10.1007/s00340-025-08600-1","DOIUrl":"10.1007/s00340-025-08600-1","url":null,"abstract":"<div><p>The manipulation of quantum states via mechanical strain offers a pathway to engineer topological excitons in soft semiconductors. Here, we present a theoretical framework that shows that helical strain transforms lead halide perovskite quantum dots (QDs) into a platform for topological excitonics. Using a first-principles-informed framework combining strain-modulated Lamé eigenstates and non-perturbative Coulomb interactions, we identify a strain-driven topological transition at critical ellipticity <span>(k = 0.59 pm 0.02)</span>, (corresponding to ≈ 2% torsional strain) marked by inversion of the exciton Chern number (<span>(C = 0 to 1)</span>) and π-Berry phase accumulation. Quantitative calculations yield an exciton binding-energy enhancement up to 45 meV and photoluminescence (PL) redshifts of ≈ 72 meV, in agreement with experimental data. The computed deformation potential (− 0.8 eV/% strain), group-velocity scaling (v ∝ k<sup>1.7</sup>), and Chern-number inversion confirm a strain-driven topological crossover supported by Berry-phase accumulation. Comparison with reported PL and diffusion measurements validates the predictive accuracy of the Lamé-Coulomb formalism, which bridges continuum elasticity with quantum confinement. These findings proposes perovskite QDs as experimentally accessible hosts of strain-tunable topological excitons, enabling reconfigurable quantum-photonic and optoelectronic devices based on mechanically programmable excitonic states.</p></div>","PeriodicalId":474,"journal":{"name":"Applied Physics B","volume":"131 12","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145613019","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

Exploring the laser-induced fluorescence of dissolved oxygen as a method for its contactless detection 探索溶解氧激光诱导荧光的非接触检测方法

IF 2 3区物理与天体物理

Applied Physics B Pub Date : 2025-11-26 DOI: 10.1007/s00340-025-08602-z

Anatoliy A. Kosterev

引用次数: 0

Application of vortex beams to 3D transform intensity distributions generated by binary generalized axicons 涡旋光束在二元广义轴生成的三维变换强度分布中的应用

IF 2 3区物理与天体物理

Applied Physics B Pub Date : 2025-11-25 DOI: 10.1007/s00340-025-08601-0

S. N. Khonina, A. V. Ustinov, O. A. Dyukareva, A. P. Porfirev

{"title":"Application of vortex beams to 3D transform intensity distributions generated by binary generalized axicons","authors":"S. N. Khonina, A. V. Ustinov, O. A. Dyukareva, A. P. Porfirev","doi":"10.1007/s00340-025-08601-0","DOIUrl":"10.1007/s00340-025-08601-0","url":null,"abstract":"<div><p>Recently, there has been a growing trend toward exploring and exploiting new/additional degrees of freedom in optical beams. This is particularly relevant in the field of multiplexing optical data transmission channels and in the interaction of laser radiation with matter. In this paper, we explore two aspects of additional degrees of freedom in axisymmetric binary elements. The first is the generalized phase dependence on the radius, which leads to variations in the longitudinal beam distribution. The second degree of freedom is associated with the binarization effect, which generates multiple axial diffraction orders. Control of these orders is proposed by introducing a vortex component in the illuminating beam. More specifically, we consider binary axisymmetric and vortex generalized axicons which are optical elements with different power-law dependence of the phase on the radius. Formation of additional axial diffraction orders associated with binarization leading to complex interference distributions on the optical axis is studied analytically, numerically and experimentally. Selection and compensation of such diffraction orders is much more complicated than off-axis ones (which can be simply isolated with an opaque screen), but their use provides a 3D character of control over the distribution and multiplexing of laser beams. It is shown that the use of vortex illuminating beams allows one to effectively solve the problem. At the same time, the allocation of high diffraction orders provides a proportional decrease in the size of the light spot on the optical axis. The experimental results fully confirm the obtained modeling results. The studies performed in this paper can be useful for variations in the size of the focal region, 3D (de-)multiplexing and coding.</p></div>","PeriodicalId":474,"journal":{"name":"Applied Physics B","volume":"131 12","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145612503","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

Spectral enhancement of narrowband XUV pulses at variable frequencies in helium 窄带XUV脉冲在氦中变频率的光谱增强

IF 2 3区物理与天体物理

Applied Physics B Pub Date : 2025-11-22 DOI: 10.1007/s00340-025-08599-5

Youda Wang, Haohan Shi, Juhao Yue, Zheng Fang, Liye Cheng, Bitao Hu, Zuoye Liu

引用次数: 0

Highly sensitive square core fiber plasmonic biosensor and Gaussian process regression for RI prediction 高灵敏度方芯光纤等离子体生物传感器及高斯过程回归预测

IF 2 3区物理与天体物理

Applied Physics B Pub Date : 2025-11-21 DOI: 10.1007/s00340-025-08603-y

Abdulkarem H. M. Almawgani, Afiquer Rahman, Aslam Mollah, Monir Abdullah, Yahya Ali Abdelrahman Ali

{"title":"Highly sensitive square core fiber plasmonic biosensor and Gaussian process regression for RI prediction","authors":"Abdulkarem H. M. Almawgani, Afiquer Rahman, Aslam Mollah, Monir Abdullah, Yahya Ali Abdelrahman Ali","doi":"10.1007/s00340-025-08603-y","DOIUrl":"10.1007/s00340-025-08603-y","url":null,"abstract":"<div><p>This paper proposes a novel square-core optical fiber with an internally gold-coated structure for RI sensing. This novel design offers a wide area for the analyte channel and a flat surface for gold film deposition. Additionally, the unique structure facilitates enhanced field interaction with the gold film, as the metal film is positioned along the core surface. The proposed sensor demonstrates outstanding performance not only in RI sensing but also in cancer cell and pathogen identification. The recorded sensitivities are 25,000 nm/RIU for RI sensing in the range of 1.33–1.41, 8571.43 nm/RIU for cancer cell detection, and 6382.98 nm/RIU for pathogen identification in water. Other performance parameters such as the figure of merit (FOM), sensor resolution, and detection accuracy (DA) also highlight the potential of this sensor in the respective domain. Another contribution of this work is the incorporation of a machine learning approach, called Gaussian Process Regression (GPR), to predict the resonance wavelength for any intermediate RI value, which could broaden the scope of this sensor’s applications.</p></div>","PeriodicalId":474,"journal":{"name":"Applied Physics B","volume":"131 12","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145561597","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

A slow light surface plasmon polariton wave in novel semiconductor nanowire metamaterial 新型半导体纳米线超材料中的慢光表面等离子激元极化子波

IF 2 3区物理与天体物理

Applied Physics B Pub Date : 2025-11-20 DOI: 10.1007/s00340-025-08593-x

Tatjana Gric

引用次数: 0

Investigating the transverse spatial coherence of 46.9 nm laser pumped by capillary discharge 研究了毛细管放电抽运46.9 nm激光器的横向空间相干性

IF 2 3区物理与天体物理

Applied Physics B Pub Date : 2025-11-20 DOI: 10.1007/s00340-025-08595-9

Dongdi Zhao, Jingjun Li, Muhammad Usman Khan, Huaiyu Cui, Bo An, Zhigang Fan, Yongpeng Zhao

引用次数: 0

HfSe2 as a saturable absorber for infrared passively Q-switched solid-state laser HfSe2作为红外被动调q固体激光器的可饱和吸收材料