IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2025-06-09 DOI: 10.1063/5.0264349

Chen-You Wei, Yu-Hong Chen, Tzu-I Kao, Cheng-En Wu, Chao-Wei Wu, Heng-Jia Chang, Yi-Ju Yao, Fu-Ju Hou, Guang-Li Luo, Yung-Chun Wu

引用次数: 0

Field-dependent anisotropic microwave responses in van der Waals ferromagnet Fe4GeTe2 范德华铁磁体Fe4GeTe2的场相关各向异性微波响应

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2025-06-09 DOI: 10.1063/5.0268615

Wei Liu, Yuanxi Liang, Yang Yang, Jingjing Ma, Aina Wang, Azizur Rahman, Jingxin Li, Min Ge, Jiyu Fan, Chunlan Ma, Li Pi, Dongsheng Song, Haifeng Du, Zhe Qu, Lei Zhang

{"title":"Field-dependent anisotropic microwave responses in van der Waals ferromagnet Fe4GeTe2","authors":"Wei Liu, Yuanxi Liang, Yang Yang, Jingjing Ma, Aina Wang, Azizur Rahman, Jingxin Li, Min Ge, Jiyu Fan, Chunlan Ma, Li Pi, Dongsheng Song, Haifeng Du, Zhe Qu, Lei Zhang","doi":"10.1063/5.0268615","DOIUrl":"https://doi.org/10.1063/5.0268615","url":null,"abstract":"The exploration of two-dimensional van der Waals (2D-vdW) ferromagnets with high Curie temperature (TC) is crucial for the development of high-performance, non-volatile, and low-power spintronic devices. 2D-vdW Fe4GeTe2 (F4GT) is considered a promising candidate material due to its nearly room-temperature TC, strong magnetization, high conductivity, and variable magnetic anisotropy. In this study, we investigate the multiple magnetic couplings in F4GT single crystals using electron spin resonance (ESR) technique. ESR lines associated with the change from perpendicular magnetic anisotropy to easy plane anisotropy are observed, indicating strong anisotropic responses to the microwaves. As the temperature increases, the resonance lines for H∥ab shift toward higher fields, while those for H∥c move toward lower fields. These opposite behaviors are attributed to the competition between the inner magnetic field and the demagnetization effect. In addition, the angle-dependent ESR spectra of F4GT single crystal exhibit a [3 cos2(π2−φ)−1]2-like behavior, which indicates a characteristic of 2D magnetic coupling attributed to the dominant effects of q→ 0 mode. These findings provide significant insights into the complex spin couplings in F4GT and pave the way for its potential applications in microwave-based spintronic devices.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"2 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144252418","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

An efficient quantum algorithm for ab initio approximations of non-linear response functions 非线性响应函数从头逼近的有效量子算法

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-06-09 DOI: 10.1038/s41534-025-01026-9

Tyler Kharazi, Torin F. Stetina, Liwen Ko, Guang Hao Low, K. Birgitta Whaley

{"title":"An efficient quantum algorithm for ab initio approximations of non-linear response functions","authors":"Tyler Kharazi, Torin F. Stetina, Liwen Ko, Guang Hao Low, K. Birgitta Whaley","doi":"10.1038/s41534-025-01026-9","DOIUrl":"https://doi.org/10.1038/s41534-025-01026-9","url":null,"abstract":"<p>We develop and analyze a fault-tolerant quantum algorithm for non-linear response properties of molecular and condensed phase systems. We consider a semi-classical description in which the electronic degrees of freedom are treated quantum mechanically and the light is treated as a classical field interacting via the electric dipole approximation. We use the technique of eigenstate filtering, to efficiently resolve excitation energies for dominant dipole transitions. When applied to the electronic structure Hamiltonian with double factorized representation, each significant spectral line can be approximated to a width of ±<i>γ</i>, and to a height of ±<i>ϵ</i> with <span>(Oleft({N}^{6}{eta }^{2}{gamma }^{-1}{epsilon }^{-1}log (1/epsilon )right))</span> queries to the block encoding of the unperturbed electronic structure Hamiltonian for <i>η</i> electrons over <i>N</i> basis functions. These quantities can be used to compute the <i>n</i>th order response functions for non-linear spectroscopies under limited assumptions using <span>(widetilde{O}left({N}^{5n+1}{eta }^{n+1}/{gamma }^{n}epsilon right))</span> queries to the block encoding of the Hamiltonian.</p>","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"89 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144252766","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

Dual-Pitch staggered Long-Period fiber grating for mode conversion and permutation 用于模式转换和排列的双间距交错长周期光纤光栅

IF 4.6 2区物理与天体物理

Optics and Laser Technology Pub Date : 2025-06-09 DOI: 10.1016/j.optlastec.2025.113326

Xin Wang, Huiyi Guo, Zekun Shi, Zhi Wang, Yan-Ge Liu

{"title":"Dual-Pitch staggered Long-Period fiber grating for mode conversion and permutation","authors":"Xin Wang, Huiyi Guo, Zekun Shi, Zhi Wang, Yan-Ge Liu","doi":"10.1016/j.optlastec.2025.113326","DOIUrl":"10.1016/j.optlastec.2025.113326","url":null,"abstract":"<div><div>Mode division multiplexing (MDM) technology enhances transmission capacity by multiplexing modes that carry distinct information. However, as transmission distance increases, the differential mode group delay (DMGD) between modes becomes more pronounced, posing a critical challenge to long-haul MDM transmission. Introducing strong mode coupling through long-period fiber gratings has proven to be an effective approach to mitigating DMGD and enabling extended transmission. In this work, we propose and demonstrate a dual-pitch staggered long-period fiber grating (DSP-LPFG) capable of facilitating mode conversion between two distinct mode pairs. By strategically distributing three sets of DSP-LPFGs along the fiber, this method achieves periodic mode permutation of four mode groups along the entire length of fiber. The combined grating generates four target modes with a purity exceeding 90 %, while the device’s insertion loss remains below 0.7 dB. Theoretically, this approach balances energy ratio variations among modes within the transmission link and mitigates associated processing capability fluctuations. Consequently, it reduces the risk of overload in the MIMO equalizer at the receiving end, effectively addressing a key limitation of long-haul MDM transmission.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"191 ","pages":"Article 113326"},"PeriodicalIF":4.6,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144240372","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

A novel extraction and evaluation method for melt pool images in laser powder bed fusion 一种新的激光粉末床熔池图像提取与评价方法

IF 4.6 2区物理与天体物理

Optics and Laser Technology Pub Date : 2025-06-09 DOI: 10.1016/j.optlastec.2025.113333

Jiansen Li , Kai Zhang , Tingting Liu , Zhiguang Zhu , Zhiyong Zou , Huiliang Wei , Zhiwei Xiong , Shi Yun , Wenhe Liao

{"title":"A novel extraction and evaluation method for melt pool images in laser powder bed fusion","authors":"Jiansen Li , Kai Zhang , Tingting Liu , Zhiguang Zhu , Zhiyong Zou , Huiliang Wei , Zhiwei Xiong , Shi Yun , Wenhe Liao","doi":"10.1016/j.optlastec.2025.113333","DOIUrl":"10.1016/j.optlastec.2025.113333","url":null,"abstract":"<div><div>In-situ monitoring of the laser powder bed fusion (LPBF) process is essential for ensuring quality and stability. This study proposes a novel extraction and evaluation method for monitoring melt pool images during LPBF to improve the accuracy and efficiency of extracted data. The proposed method segments the melt pool into regions of interest (ROI) based on the intensity gradient of the melt pool boundary in the images, enabling the extraction of texture features from the Gray Level Co-Occurrence Matrix (GLCM) subsequently. The intensity-gradient image processing has improved robustness and accuracy. Based on the widths from the melt pool and single track, the mean square error (MSE) is 12.22 μm, outperforming the conventional fixed-threshold method by 25.3 %. In addition, a classification and regression tree (CART) model was used to categorize the melt pools into four types—balling, irregularity, normal, and over-melting—based on geometric, shape, temperature, and texture features, achieving a classification accuracy of 97.24 %. It is found that the texture feature, contributing to 58.4 % of the importance, and the temperature feature, contributing 37.6 %, emerged as vital features in the melt pool identification process. The texture feature is particularly effective in identifying melt pools in normal and over-melting modes, mainly due to the Correlation (COR) and Contrast (CON). Our research sheds light on improving the accuracy of melt pool segmentation significantly and offers crucial insights for feature extraction, thereby providing considerable assistance for online defect identification in LPBF.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"191 ","pages":"Article 113333"},"PeriodicalIF":4.6,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144240383","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

Deep-learning based fringe-print-through error and noise removal for dynamic phase-shifting interferometry 基于深度学习的条纹穿透误差和噪声去除的动态移相干涉测量

IF 4.6 2区物理与天体物理

Optics and Laser Technology Pub Date : 2025-06-09 DOI: 10.1016/j.optlastec.2025.113313

Manh The Nguyen , In-Kyu Park , Hyug-Gyo Rhee , Young-Sik Ghim

{"title":"Deep-learning based fringe-print-through error and noise removal for dynamic phase-shifting interferometry","authors":"Manh The Nguyen , In-Kyu Park , Hyug-Gyo Rhee , Young-Sik Ghim","doi":"10.1016/j.optlastec.2025.113313","DOIUrl":"10.1016/j.optlastec.2025.113313","url":null,"abstract":"<div><div>High-speed and precise surface measurement is crucial in manufacturing, particularly in the semiconductor industry. Dynamic phase-shifting interferometry is a highly efficient and widely recognized optical metrology technique, known for its exceptional accuracy and speed, making it ideal for industrial inspection and measurement tasks. However, incorrect phase-shift intervals between interferograms generated by this technique can lead to fringe-print-through (FPT) errors in the surface measurements. Additionally, additive Gaussian noise present in the interferograms complicates the accurate assessment of residual surface after measurements. Rapidly eliminating these FPT errors and noise is essential for achieving high-accuracy and high-speed measurement applications. In this paper, we propose a novel deep-learning method to simultaneously eliminate FPT errors and noise in dynamic phase-shifting interferometry. Our approach utilizes a UNet++ deep-learning network, which processes the surface phase containing errors as input and outputs the corresponding FPT errors and noise. Trained on simulated data, the model learns to directly predict these errors and noise from the surface phase with errors. Consequently, the corrected surface phase is obtained by subtracting the predicted FPT errors and noise from the initial surface phase. Simulation and experimental results demonstrate that our deep-learning method effectively removes FPT errors and noise, providing broad versatility, rapid processing, and robustness, thereby significantly enhancing measurement accuracy in dynamic measurement applications.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"191 ","pages":"Article 113313"},"PeriodicalIF":4.6,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144240386","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

Theoretical investigation of the triple differential cross section in the nitrogen molecule ionization by electron and positron impact 氮分子电子与正电子碰撞电离中三重微分截面的理论研究

IF 1.8 4区物理与天体物理

Journal of Electron Spectroscopy and Related Phenomena Pub Date : 2025-06-09 DOI: 10.1016/j.elspec.2025.147545

Sana Mekhalfa , Salim Houamer , Abdelaziz Mansouri , Imene Khiat , Ayoub Tamin , Claude Dal Cappello , Paul-Antoine Hervieux

{"title":"Theoretical investigation of the triple differential cross section in the nitrogen molecule ionization by electron and positron impact","authors":"Sana Mekhalfa , Salim Houamer , Abdelaziz Mansouri , Imene Khiat , Ayoub Tamin , Claude Dal Cappello , Paul-Antoine Hervieux","doi":"10.1016/j.elspec.2025.147545","DOIUrl":"10.1016/j.elspec.2025.147545","url":null,"abstract":"<div><div>Calculations of the triple differential cross section (TDCS) for positron and electron impact ionization have been performed for the inner as well as the outer orbitals of nitrogen molecule, within a model developed for molecular targets and called M3CWZ. In this model, a full Coulomb wave scheme with variable charges to describe the continuum particles is used, taking into account the post collision interaction (PCI). Experiments performed in asymmetric geometries at large and lower recoil momentum have been investigated for the outer (<span><math><mrow><mn>2</mn><msub><mrow><mi>σ</mi></mrow><mrow><mi>u</mi></mrow></msub></mrow></math></span>, <span><math><mrow><mn>1</mn><msub><mrow><mi>π</mi></mrow><mrow><mi>u</mi></mrow></msub></mrow></math></span>and<span><math><mrow><mn>3</mn><msub><mrow><mi>σ</mi></mrow><mrow><mi>g</mi></mrow></msub></mrow></math></span>) as well as the inner <span><math><mrow><mn>2</mn><msub><mrow><mi>σ</mi></mrow><mrow><mi>g</mi></mrow></msub></mrow></math></span> orbitals, comparison is then made between experimental data and theory. At intermediate impact energies (up to 700 eV), it is found that the M3CWZ model is able to predict the general trends of the TDCS for the outer orbitals at large recoil momentum when the residual ion plays substantial role, better than other sophisticated models. For the inner <span><math><mrow><mn>2</mn><msub><mrow><mi>σ</mi></mrow><mrow><mi>g</mi></mrow></msub></mrow></math></span> orbital the large intensity of the TDCS observed in the recoil region is not correctly reproduced by the present calculations. At lower 250 eV impact energy, a moderate agreement with the data is achieved for outer <span><math><mrow><mn>3</mn><msub><mrow><mi>σ</mi></mrow><mrow><mi>g</mi></mrow></msub></mrow></math></span>orbital.</div></div>","PeriodicalId":15726,"journal":{"name":"Journal of Electron Spectroscopy and Related Phenomena","volume":"281 ","pages":"Article 147545"},"PeriodicalIF":1.8,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144242787","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

Photoemission Electron Microscopy of Exciton–Polaritons in Thin WSe2 Waveguides 薄WSe2波导中激子极化子的光电发射电子显微镜

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2025-06-09 DOI: 10.1021/acsphotonics.5c00290

Tobias Eul, Miwan Sabir, Victor DeManuel-Gonzalez, Florian Diekmann, Kai Rossnagel, Michael Bauer

引用次数: 0

Optical wavefront aberration: detection, recognition, and compensation techniques – a comprehensive review 光波前像差：检测、识别和补偿技术-综合综述

IF 4.6 2区物理与天体物理

Optics and Laser Technology Pub Date : 2025-06-09 DOI: 10.1016/j.optlastec.2025.113342

P.A. Khorin , A.P. Dzyuba , S.N. Khonina

{"title":"Optical wavefront aberration: detection, recognition, and compensation techniques – a comprehensive review","authors":"P.A. Khorin , A.P. Dzyuba , S.N. Khonina","doi":"10.1016/j.optlastec.2025.113342","DOIUrl":"10.1016/j.optlastec.2025.113342","url":null,"abstract":"<div><div>Wavefront aberration sensors are essential tools in optical systems, enabling accurate measurement and correction of deviations from ideal wavefront shapes. This review provides a comprehensive overview of the key wavefront sensing technologies, including interferometry, Pyramid wavefront sensors, Shack-Hartmann wavefront sensors, and aberration-matched filters. Each sensor type is examined with respect to its underlying principles, practical applications, and performance characteristics. Greater emphasis is placed on the detailed comparison between the classic Shack-Hartmann wavefront sensor, the pyramid wavefront sensor employing a refractive optical element, and aberration-matched filters utilizing diffractive optics. The integration of diffractive optics in matched filtering plays a pivotal role in enhancing the system’s performance, enabling the effective application of machine learning techniques for accurate detection and compensation of optical aberrations. The paper also explores the transformative role of artificial intelligence in advancing these technologies, highlighting how machine learning and deep learning techniques are being applied to enhance sensor accuracy, robustness, and adaptability. Additionally, the limitations and challenges associated with each type of sensor, such as cost, resolution constraints, and sensitivity to environmental conditions, are discussed. By addressing both traditional and AI-enhanced wavefront sensing methods, this review aims to provide insights into current trends and future directions in wavefront aberration measurement and correction.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"191 ","pages":"Article 113342"},"PeriodicalIF":4.6,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144240647","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

Dual holographic and polarization encoding for high fidelity image transmission through multimode fibers 通过多模光纤传输高保真图像的双全息和偏振编码

IF 4.6 2区物理与天体物理

Optics and Laser Technology Pub Date : 2025-06-09 DOI: 10.1016/j.optlastec.2025.113301

Jing Xu , Zhicheng Ye , Shuang Wang , Fei Yu , Chunlei Yu , Yang Du

{"title":"Dual holographic and polarization encoding for high fidelity image transmission through multimode fibers","authors":"Jing Xu , Zhicheng Ye , Shuang Wang , Fei Yu , Chunlei Yu , Yang Du","doi":"10.1016/j.optlastec.2025.113301","DOIUrl":"10.1016/j.optlastec.2025.113301","url":null,"abstract":"<div><div>Multimode fibers (MMFs) enable high-resolution imaging due to their capacity to support numerous spatial modes within a compact and minimally invasive form factor. However, inherent intermodal coupling, modal interference, and reflections from the fiber sidewalls generate complex speckle like distortions, severely restricting image transmission fidelity. Here, we demonstrate a dual-encoding approach that simultaneously employs holographic and polarization multiplexing to significantly enhance the information capacity of MMFs. Images encoded holographically into distinct spatial and polarization channels were transmitted through a step-index MMF and reconstructed from far-field speckle patterns using a modified convolutional neural network (DeepLeakyU-Net). The acquired speckle patterns exhibit clear clustering based on their encoded polarization and holographic labels, facilitating robust multiplexed reconstruction. High-quality image reconstruction was achieved with structural similarity indices averaging 0.93 across all polarization states. Our method leverages angular correlations in the far-field regime of MMFs, providing a mechanism to exploit the fiber’s multimodal potential, thus paving the way toward scalable multimode fiber-based imaging systems with enhanced multiplexing capabilities for applications in biomedical endoscopy and optical communications.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"191 ","pages":"Article 113301"},"PeriodicalIF":4.6,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144240373","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

物理与天体物理最新文献