IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2025-08-02 DOI: 10.1016/j.physb.2025.417656

M.V. Goryunov , I. Felner , G. Varga , Z. Dankházi , A.V. Chukin , S.P. Naumov , G. Leitus , R.F. Muftakhetdinova , E. Kuzmann , Z. Homonnay , M.I. Oshtrakh

{"title":"Magnetic features of some extraterrestrial Fe-Ni-Co alloys: Study using magnetization measurements and Mössbauer spectroscopy","authors":"M.V. Goryunov , I. Felner , G. Varga , Z. Dankházi , A.V. Chukin , S.P. Naumov , G. Leitus , R.F. Muftakhetdinova , E. Kuzmann , Z. Homonnay , M.I. Oshtrakh","doi":"10.1016/j.physb.2025.417656","DOIUrl":"10.1016/j.physb.2025.417656","url":null,"abstract":"<div><div>Magnetic features of extraterrestrial Fe-Ni-Co alloys from iron and stony-iron meteorites were studied by scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS), X-ray diffraction, Mössbauer spectroscopy and magnetization measurements. SEM with EDS demonstrated the presence of different compositions of the α-Fe(Ni, Co), α<sub>2</sub>-Fe(Ni, Co), γ-Fe(Ni, Co) and γ-FeNi(Co) phases in various alloys with variations in Ni concentrations. The Mössbauer spectra of Fe-Ni-Co alloys consist of different numbers of magnetic sextets. The values of <sup>57</sup>Fe hyperfine parameters were assigned to corresponding α-Fe(Ni, Co), α<sub>2</sub>-Fe(Ni, Co), γ-Fe(Ni, Co) and γ-FeNi(Co) phases. The saturation magnetic moments for some Fe-Ni-Co alloys were slightly higher while those for other Fe-Ni-Co alloys were slightly lower than that of pure Fe. The zero-field-cooled (ZFC) and field-cooled (FC) branches of the magnetization curves showed unusual behavior for Fe-Ni-Co alloys from three meteorites when the ZFC curve lies over the FC one which is a very rare phenomenon.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"716 ","pages":"Article 417656"},"PeriodicalIF":2.8,"publicationDate":"2025-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144757657","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

Polychromatic Adaptive Optics‐Assisted Stimulated Raman Scattering Microscopy Enables Deep Tissue Chemical Imaging 多色自适应光学辅助受激拉曼散射显微镜实现深层组织化学成像

IF 11 1区物理与天体物理

Laser & Photonics Reviews Pub Date : 2025-08-02 DOI: 10.1002/lpor.202501022

Weiqi Wang, Zhiwei Huang

{"title":"Polychromatic Adaptive Optics‐Assisted Stimulated Raman Scattering Microscopy Enables Deep Tissue Chemical Imaging","authors":"Weiqi Wang, Zhiwei Huang","doi":"10.1002/lpor.202501022","DOIUrl":"https://doi.org/10.1002/lpor.202501022","url":null,"abstract":"Stimulated Raman scattering (SRS) microscopy has revolutionized label‐free chemical imaging by leveraging molecular vibrations to reveal biochemical compositions of cells and tissues. However, the wavelength‐dependent scattering in tissues distorts laser beam wavefronts, significantly degrading image quality and depth in SRS imaging. Here, the study introduces a unique polychromatic adaptive optics‐assisted SRS (PAO‐SRS) microscopy, enabling high‐sensitivity, high‐resolution, deep tissue 3D imaging in turbid samples. By employing a spatial light modulator (SLM) to independently correct aberrations in incident SRS beams, PAO‐SRS effectively addresses tissue‐induced, wavelength‐dependent scattering, thereby maintaining a high signal‐to‐noise ratio in deep tissue regions. PAO‐SRS provides remarkable ∼3‐fold enhancement in SRS intensity in deep brain tissue, leading to a 3‐fold increase in SRS imaging depth. Further, PAO‐SRS enables mechanical z‐scanning‐free, aberration‐free 3D chemical imaging by electronically controlling the axial positions of laser foci associated with the corresponding aberration corrections at each tissue depth. An enhanced imaging resolution and intensity in zebrafish liver region is demonstrated using PAO‐SRS, and also visualizes global metabolic variations in live zebrafish liver, unraveling distinct chemical differences between normal and tumor liver under starvations. PAO‐SRS holds great potential for advancing label‐free, high‐resolution, 3D chemical imaging in deep tissue, opening new avenues in biomedical research and diagnostics.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"11 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144763335","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

Self-accelerating topological edge states 自加速拓扑边缘态

IF 7.5 2区物理与天体物理

Nanophotonics Pub Date : 2025-08-01 DOI: 10.1515/nanoph-2025-0268

Zhuo Zhang, Yaroslav V. Kartashov, Milivoj R. Belić, Yongdong Li, Yiqi Zhang

{"title":"Self-accelerating topological edge states","authors":"Zhuo Zhang, Yaroslav V. Kartashov, Milivoj R. Belić, Yongdong Li, Yiqi Zhang","doi":"10.1515/nanoph-2025-0268","DOIUrl":"https://doi.org/10.1515/nanoph-2025-0268","url":null,"abstract":"Edge states emerging at the boundaries of materials with nontrivial topology are attractive for many practical applications due to their remarkable robustness to disorder and local boundary deformations, which cannot result in scattering of the energy of the edge states impinging on such defects into the bulk of material, as long as forbidden topological gap remains open in its spectrum. The velocity of such states traveling along the edge of the topological insulator is typically determined by their Bloch momentum. In contrast, here, using valley Hall edge states forming at the domain wall between two honeycomb lattices with broken inversion symmetry, we show that by imposing Airy envelope on them one can construct edge states which, on the one hand, exhibit self-acceleration along the boundary of the insulator despite their fixed Bloch momentum and, on the other hand, do not diffract along the boundary despite the presence of localized features in their shapes. We construct both linear and nonlinear self-accelerating edge states, and show that nonlinearity considerably affects their envelopes. Such self-accelerating edge states exhibit self-healing properties typical for nondiffracting beams. Self-accelerating valley Hall edge states can circumvent sharp corners, provided the oscillating tail of the self-accelerating topological state is properly apodized by using an exponential function. Our findings open new prospects for control of propagation dynamics of edge excitations in topological insulators and allow to study rich phenomena that may occur upon interactions of nonlinear envelope topological states.","PeriodicalId":19027,"journal":{"name":"Nanophotonics","volume":"11 1","pages":""},"PeriodicalIF":7.5,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144763182","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

Zero‐Dimensional Metal Halides Inorganic Frameworks Modulation for Sensitivity and Stable Direct X‐Ray Detection 零维金属卤化物无机框架调制的灵敏度和稳定的直接X射线探测

IF 11 1区物理与天体物理

Laser & Photonics Reviews Pub Date : 2025-08-01 DOI: 10.1002/lpor.202501336

Yujiang Wu, Youkui Xu, Yutian Lei, Guoqiang Peng, Yuhang Zhou, Qijun Li, ZhenHua Li, Qian Wang, Zhiwen Jin

{"title":"Zero‐Dimensional Metal Halides Inorganic Frameworks Modulation for Sensitivity and Stable Direct X‐Ray Detection","authors":"Yujiang Wu, Youkui Xu, Yutian Lei, Guoqiang Peng, Yuhang Zhou, Qijun Li, ZhenHua Li, Qian Wang, Zhiwen Jin","doi":"10.1002/lpor.202501336","DOIUrl":"https://doi.org/10.1002/lpor.202501336","url":null,"abstract":"Zero‐Dimensional (0D) metal halides (MHs) exhibit unique optoelectronic properties in next‐generation X‐ray imaging technology, stemming from their isolated polyhedral structures. However, the limited understanding of the insulating behaviors of organic cationic spacers, the kinetic mechanisms regulating charge transport within isolated inorganic frameworks, and the synergistic effects between these components have resulted in suboptimal carrier transport and collection efficiencies. Herein, the correlation between the coordination and performance of inorganic frameworks is investigated, and it is concluded that the inorganic framework exhibits unique charge transport characteristics with organic cations. 0D single crystals, namely MPAZE‐ZnBr4·H2O (15 × 5 × 3 mm3) and MPAZE‐MnBr3(H2O)3·Br (15 × 10 × 8 mm3), are successfully synthesized. The inorganic framework significantly governs the steric hindrance within the material and dictates the involvement of organic cations in the conduction process. Density functional theory (DFT) is employed to analyze the coordination geometries of organic cations with inorganic frameworks, as well as the impacts of binding energies and band structure contributions on charge transport dynamics and device performance. The resulting X‐ray detector demonstrates a high sensitivity of 9185 µC Gyair−1 cm−2 and a low detection limit of 0.573 µGyair s−1, alongside excellent environmental stability.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"1 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144763336","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

Theory, innovations and applications of stimulated Raman scattering microscopy 受激拉曼散射显微镜的理论、创新与应用

IF 35 1区物理与天体物理

Nature Photonics Pub Date : 2025-08-01 DOI: 10.1038/s41566-025-01707-z

Wei Min, Ji-Xin Cheng, Yasuyuki Ozeki

引用次数: 0

Laser welding of thin NiTi shape memory alloy wires on printed circuit boards for actuator applications 用于执行器应用的印刷电路板上镍钛形状记忆合金细线的激光焊接

IF 5 2区物理与天体物理

Optics and Laser Technology Pub Date : 2025-08-01 DOI: 10.1016/j.optlastec.2025.113605

Marvin Schuleit , Cemal Esen , Jan Frenzel , Nicole Stötzel , Aleksander Kostka , Burkhard Maaß , Gunther Eggeler , Andreas Ostendorf

{"title":"Laser welding of thin NiTi shape memory alloy wires on printed circuit boards for actuator applications","authors":"Marvin Schuleit , Cemal Esen , Jan Frenzel , Nicole Stötzel , Aleksander Kostka , Burkhard Maaß , Gunther Eggeler , Andreas Ostendorf","doi":"10.1016/j.optlastec.2025.113605","DOIUrl":"10.1016/j.optlastec.2025.113605","url":null,"abstract":"<div><div>The present study demonstrates the potential of laser welding nickel–titanium (Ni-Ti) shape memory alloy wires to copper-tin (Cu-Sn) coated printed circuit boards (PCBs), achieving mechanical strengths of up to 705 MPa <span><math><mo>±</mo></math></span> 23 MPa. Nanosecond laser pulses enabled the formation of robust joints without visible thermal damage to the thermally sensitive PCB. Scanning and transmission electron microscopy revealed a complex microstructure in the fusion zone, including sharp gradients in grain size, and intermetallic phases such as NiTi (B2), NiTiSn, Cu<sub>6</sub>Sn<sub>5</sub>, Sn, and Cu. Despite the presence of these microstructural constituents, mechanical testing confirmed a good structural integrity of the joints. Under the specific actuation fatigue testing conditions considered in this study, fatigue failure primarily occurred in the unprocessed base NiTi material, suggesting that the welded regions did not significantly affect fatigue lives. Thermal imaging revealed that the SMA wires in joint regions did not undergo complete phase transformations as the adjacent Cu-Sn-layers of the PCB act as a heat sink. This contributes to the good fatigue performance. The findings of the present study highlight the potential of this joining method for straightforward and reliable integration of NiTi wires into actuator systems.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"192 ","pages":"Article 113605"},"PeriodicalIF":5.0,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144758102","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

Parametric instability of forward volume spin waves pumped by surface acoustic waves in yttrium iron garnet films 钇铁石榴石膜中表面声波泵送的前体积自旋波的参数不稳定性

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2025-08-01 DOI: 10.1063/5.0280832

C. Rivard, A. Jander, P. Dhagat

引用次数: 0

Measurement of the cavity dispersion in quantum cascade lasers using subthreshold luminescence 用亚阈值发光测量量子级联激光器的腔色散

IF 7.5 2区物理与天体物理

Nanophotonics Pub Date : 2025-08-01 DOI: 10.1515/nanoph-2025-0078

Barbara Schneider, Jérôme Faist

引用次数: 0

Evidence of pair density waves pinned by Zn impurities in Bi2Sr2Ca(Cu1−xZnx)2O8+δ Bi2Sr2Ca(Cu1−xZnx)2O8+δ中Zn杂质钉住对密度波的证据