Results in Physics最新文献

{"title":"Generation of 6-μJ ultrafast pulses from an Er-doped laser system","authors":"Tingting Liu ,&nbsp;Mei Yang ,&nbsp;Ming Yan ,&nbsp;Zhengru Guo ,&nbsp;Qiang Hao ,&nbsp;Kun Huang ,&nbsp;Yan Dai ,&nbsp;Heping Zeng","doi":"10.1016/j.rinp.2025.108439","DOIUrl":"10.1016/j.rinp.2025.108439","url":null,"abstract":"<div><div>High-power lasers at 1.55 μm have mostly been constructed in the free-space configuration or the non-polarization-maintaining (PM) fiber structures, which significantly limits the practical deployment in widespread applications. Here, we reported a robust linear-polarized Er-doped laser system, except for the bulky grating pulse compressor. The laser system can deliver high-energy ultrashort pulses at μJ level in a wide range of programmable repetition rates from about 2.1 MHz down to 200 kHz. Specifically, a high pulse energy of 6 μJ, unprecedented in the PM fiber scheme, is achieved at 200 kHz repetition rate, yielding corresponding MW-level peak power. The beam quality is verified by an M²-value of 1.4. The presented laser system features high pulse energy, high peak power, and good beam quality, which constitutes a useful source for diverse applications such as material processing, biomedical imaging, and laser machining.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"77 ","pages":"Article 108439"},"PeriodicalIF":4.6,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145159561","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}

{"title":"Orbital-engineered spin asymmetry and multifunctionality in Eu-activated CaSiO3: a first-principles roadmap to optical-thermoelectric fusion","authors":"Muhammad Tayyab ,&nbsp;Faiq Umar ,&nbsp;Sikander Azam ,&nbsp;Qaiser Rafiq ,&nbsp;Rajwali Khan ,&nbsp;Muhammad Tahir Khan ,&nbsp;Vineet Tirth ,&nbsp;Ali Algahtani","doi":"10.1016/j.rinp.2025.108440","DOIUrl":"10.1016/j.rinp.2025.108440","url":null,"abstract":"<div><div>Rare-earth-doped nitride phosphors have emerged as critical materials for solid-state lighting and photonic devices due to their high thermal stability, narrow emission bandwidths, and strong absorption in the UV-blue range. In this study, we present a comprehensive density functional theory (DFT) investigation, incorporating GGA + U formalism, of pristine and Eu³⁺-doped CaAlSiN₃ with doping concentrations of 8.5 % and 17 %. The electronic structure calculations reveal that Eu doping introduces localized 4f states within the band-gap, reducing the band-gap and enabling efficient red photo luminescence (PL) through the ⁵D₀ → ⁷F₂ transition. Analysis of the spin-resolved density of states and spin density confirms the magnetic nature of Eu³⁺, with a net magnetic moment arising from the unpaired 4f⁶ electrons. Charge density, Bader analysis, and Electron Localization Function (ELF) plots demonstrate the mixed ionic-covalent bonding nature and confirm the charge transfer from Eu to the neighboring N and Al atoms, stabilizing the doped lattice. Optical properties, including the dielectric function (ε₁ and ε₂), absorption coefficient, refractive index, and reflectivity, were evaluated, revealing significant redshifts in the absorption edge and enhanced light-matter interaction in the visible spectrum upon Eu doping. These changes are consistent with experimental PL emission in the red–NIR region. The formation energy calculations confirm the thermodynamic feasibility of Eu incorporation, while elastic constant evaluation and Pugh’s ratio suggest excellent mechanical stability and ductility of both pristine and doped systems. Thermoelectric transport coefficients were evaluated using WIEN2k coupled with BoltzTraP, revealing that moderate Eu³⁺ substitution optimizes the power factor while Eu-induced disorder reduces the lattice thermal conductivity. This multi-scale theoretical analysis validates Eu-doped CaAlSiN₃ as a robust and efficient red-emitting phosphor suitable for white light-emitting diodes (WLEDs), offering predictive insights into its structure–property relationships. The study establishes a firm theoretical foundation for crystal site engineering strategies in phosphor materials for advanced optoelectronic applications.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"77 ","pages":"Article 108440"},"PeriodicalIF":4.6,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145107870","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}

{"title":"Theoretical investigation of electronic structure and thermoelectric properties of AlGa point defects in two-dimensional β-Ga2O3","authors":"Junjie Guo,&nbsp;Chunyan Song,&nbsp;Hui Liao,&nbsp;Jiaming Qi,&nbsp;Ningxuan Yang,&nbsp;Rui Wang,&nbsp;Jiuming Wang,&nbsp;Boyang Huang,&nbsp;Zihan Huang","doi":"10.1016/j.rinp.2025.108424","DOIUrl":"10.1016/j.rinp.2025.108424","url":null,"abstract":"<div><div>As a wide-bandgap semiconductor, β-Ga₂O₃ possesses excellent physical and chemical properties, such as ultra-low lattice thermal conductivity for thermoelectric applications. We investigated the electronic structure and thermoelectric properties of two-dimensional (2D) β-Ga₂O₃ with Al substitutions at four sites (surface/inner tetrahedral Ga(I) and octahedral Ga(II)) using density-functional theory (DFT) and Boltzmann transport theory. It was found that: (1) Compared to intrinsic 2D β-Ga₂O₃, the bandgap of surface tetrahedral Al-doped 2D β-Ga₂O₃ (I-2D) is reduced by 0.035 eV, and the density of states (DOS) for four distinct Al_Ga point defects in 2D β-Ga₂O₃ indicates that Al(p) orbitals contribute mainly to the valence band maximum (VBM). (2) 2D β-Ga₂O₃ with Al_Ga enhances n-type Seebeck coefficients. Especially, I-2D achieves the maximum power factor of 2.70 × 10¹⁰ W/(m·K²·s) of power factor for n-type near 0.8 eV (300 K), which is higher than the intrinsic value of 1.36 × 10¹⁰ W/(m·K²·s). (3) For n-type, Ⅰ-2D β-Ga₂O₃, the electrical conductivity is 4.66 × 10¹⁸/(Ω·m·s), at 1.0 eV and the electronic thermal conductivity (κ_e) is 1.9 × 10¹³ W/(m·K) near 0.8 eV at 300 K. The Lorenz numbers for the five 2D β-Ga₂O₃ structures all conform to the Lorenz distribution, indicating that the calculation results of thermal conductivity and electrical conductivity are accurate and reliable. (4) Type I-2D β-Ga₂O₃ achieves a peak n-type ZT_e of 1.79 at 900 K (vs. 0.96 for intrinsic). The results demonstrate that Al doping in 2D β-Ga₂O₃ optimizes thermoelectric properties for applications.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"77 ","pages":"Article 108424"},"PeriodicalIF":4.6,"publicationDate":"2025-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145107547","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}

{"title":"Europium decorated magnetic nanoparticles design for identification of latent fingerprints on different surfaces applications","authors":"Israel Montoya Matos ,&nbsp;Sonia Andia Huaracha ,&nbsp;Lizbet León Félix ,&nbsp;David Pacheco Salazar ,&nbsp;Raquel Checca Huaman ,&nbsp;Juan Carlos Yacono Llanos","doi":"10.1016/j.rinp.2025.108426","DOIUrl":"10.1016/j.rinp.2025.108426","url":null,"abstract":"<div><div>The use of multifunctional nanomaterials with magnetic and luminescent properties has gained significant attention in forensic applications for latent fingerprint identification. In this study, we present a synthesis route for preparing chitosan-coated magnetite nanoparticles (MN-CH) by the coprecipitation method and functionalized with europium ions (MN-CH-Eu). These luminescent magnetic nanoparticles hold potential for the identification of latent fingerprints on different surfaces, including metal, plastic, and glass. Remarkably, structural analysis of MN-CH-Eu confirmed the retention of the magnetite crystalline structure through X-ray diffraction. Scanning electron microscopy and EDS mapping provided evidence of europium presence and its homogeneous distribution on the MN-CH surface. The interactions between chitosan and the nanoparticle core were mainly via electrostatic and hydrogen bonding, as confirmed by Fourier-transform infrared spectroscopy. Importantly, the europium-functionalized nanoparticles exhibited characteristic red photoluminescence, dominated by the hypersensitive ⁵D₀ → ⁷F₂ transition (∼612 nm), when excited under UV light. This emission was preserved due to the spatial isolation of Eu³⁺ within the chitosan matrix, which minimized quenching effects from the Fe₃O₄ core. After 24 h at room temperature, developed fingerprints appeared brown under natural light and bright green or reddish under UV illumination, depending on the excitation wavelength (notably 254 nm and 324 nm). The MN-CH-Eu nanoparticles were particularly effective on metal surfaces under both lighting conditions. These findings highlight the successful integration of luminescent and magnetic functionalities within a single nanomaterial, enhancing latent fingerprint detection through both physical adherence and optical contrast, and broadening the scope for forensic applications across various substrates and environmental conditions.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"77 ","pages":"Article 108426"},"PeriodicalIF":4.6,"publicationDate":"2025-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145107546","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}

{"title":"Vavilov-Cherenkov radiation and catastrophe theory","authors":"L. Krupa","doi":"10.1016/j.rinp.2025.108427","DOIUrl":"10.1016/j.rinp.2025.108427","url":null,"abstract":"<div><div>The problem of the Vavilov-Cherenkov radiation arising at an arbitrary motion of a charged particle in a transparent isotropic medium is studied. The generalised Tamm-Frank condition for the appearance of radiation is derived. Using the catastrophe theory, the existence of a new type of radiation, the cuspoid Vavilov-Cherenkov radiation, is predicted, which is more intense than the ordinary Vavilov-Cherenkov radiation. The condition for the appearance of this new radiation is derived. The realisation of fold catastrophe A₂ and boundary catastrophe B₂ in electromagnetic radiation have been studied in more detail in the case of the rectilinear motion of a charged particle.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"77 ","pages":"Article 108427"},"PeriodicalIF":4.6,"publicationDate":"2025-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145110045","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}

{"title":"Polarization state control in the focal region of a binary polarized and phase-delayed zone plate","authors":"Hector A. Trejo-Mandujano,&nbsp;Elsa G. Ordóñez-Casanova,&nbsp;Abdiel Ramírez-Reyes,&nbsp;Betania Sánchez-Santamaría","doi":"10.1016/j.rinp.2025.108399","DOIUrl":"10.1016/j.rinp.2025.108399","url":null,"abstract":"<div><div>This paper presents a device for controlling optical fields using conic binary zone plates. These plates consist of two orthogonal polarizers integrated with a phase retardation plate. When illuminated with linearly polarized light, and by varying the phase shift between the orthogonal components, the polarization state at the focal region can be dynamically modified. This method enables precise control of optical properties, with potential applications in areas such as optical communications. The effectiveness of the proposed device is demonstrated through computational simulations, which illustrate how the optical field behavior changes under different operating conditions.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"77 ","pages":"Article 108399"},"PeriodicalIF":4.6,"publicationDate":"2025-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145107889","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}

{"title":"Conversion of Zernike polynomial coefficients to wave aberration power series coefficients","authors":"Zichao Fan ,&nbsp;Shili Wei","doi":"10.1016/j.rinp.2025.108430","DOIUrl":"10.1016/j.rinp.2025.108430","url":null,"abstract":"<div><div>As fundamental tools in optical engineering, H. Hopkins’ wave aberration function and Zernike polynomials have respectively dominated optical design and wavefront characterization for decades. While the former underpins modern aberration analysis, the latter has become indispensable in optical testing, precision alignment, and quantitative phase evaluation at exit pupils. With the increasing complexity of contemporary optical systems requiring multidisciplinary integration, advanced simulations demand concurrent consideration of wave optical effects and geometric aberration theory, which necessitates establishing explicit connections between these two pivotal mathematical frameworks over circular apertures. Leveraging the field-dependent characteristics of Zernike polynomials, we achieve term-wise correspondence between the two polynomial systems. This approach enables rigorous derivation of an explicit transformation matrix connecting the mathematical formulations. Numerical implementations validate the proposed methodology while revealing critical insights into aberration decomposition mechanisms. The established framework provides theoretical guidance for optimizing complex optical systems, where wavefront manipulation and aberration control require coordinated treatment.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"77 ","pages":"Article 108430"},"PeriodicalIF":4.6,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145061373","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}

{"title":"Ferroelectric order and nonlinear optical response in Hexagonal-HoMnO3","authors":"E. Martínez-Aguilar ,&nbsp;H’Linh Hmok ,&nbsp;Rigoberto López-Juárez","doi":"10.1016/j.rinp.2025.108422","DOIUrl":"10.1016/j.rinp.2025.108422","url":null,"abstract":"<div><div>In this work, first-principles calculations have been performed, to elucidate the electronic, structural, optical, and ferroelectric properties of <em>h</em>-HoMnO<span><math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math></span>, making emphasis on its polar and shift current response. The results confirm a spontaneous polarization along the <em>c</em>-axis driven by the hybridization of the Mn-O orbitals, and the concomitant shift of the Ho ion in the same direction. Shift current calculations reveal a significant anisotropic response with a stronger current generation along the polar axis, demonstrating a direct correlation between ferroelectricity and nonlinear optical effects. These results position the <em>h</em>-HoMnO<span><math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math></span> as a promising candidate for optoelectronic and energy harvesting applications without conventional <span><math><mi>p</mi></math></span>-<span><math><mi>n</mi></math></span> junctions.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"77 ","pages":"Article 108422"},"PeriodicalIF":4.6,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145048153","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}

{"title":"Experimental and theoretical radiative parameters of some odd-parity levels in Tb III","authors":"Hongfeng Zheng ,&nbsp;Yu Wang ,&nbsp;Huifang Li ,&nbsp;Qingsen Xu ,&nbsp;Shujun Chen ,&nbsp;Zhuoyang He ,&nbsp;Zhonghai Zhai ,&nbsp;Zhenwen Dai","doi":"10.1016/j.rinp.2025.108428","DOIUrl":"10.1016/j.rinp.2025.108428","url":null,"abstract":"<div><div>Natural radiative lifetimes of 19 odd-parity levels of Tb III in the energy range between 52,039 and 62,734 cm⁻¹ were measured by the time-resolved laser-induced fluorescence method. To our knowledge, the lifetimes for 16 out of 19 levels were measured for the first time. The pseudo-relativistic Hartree-Fock method was used to calculate the lifetimes and branching fractions (BFs) of the investigated energy levels. Combining the measured lifetimes with the theoretical BFs, the semiempirical transition probabilities and oscillator strengths for 245 lines were determined, 58 lines of which were determined for the first time.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"77 ","pages":"Article 108428"},"PeriodicalIF":4.6,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145048151","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}

{"title":"Optoelectronic, magnetic, EFG and NMR properties of olivine-type LiMPO4 (M = Fe, Mn, Co, Mg) cathodes for application in lithium-ion battery by DFT","authors":"H. Vahidi ,&nbsp;H.A. Rahnamaye Aliabad ,&nbsp;Evren Görkem Özdemir","doi":"10.1016/j.rinp.2025.108425","DOIUrl":"10.1016/j.rinp.2025.108425","url":null,"abstract":"<div><div>In this study, we present a comprehensive first-principles investigation into the structural, electronic, optical, magnetic, and hyperfine properties of olivine-type LiMPO₄ compounds (M =Co, Fe, Mg, Mn), using the full-potential linearized augmented plane wave (FP-LAPW) method within density functional theory (DFT). All compounds crystallize in the orthorhombic Pnma space group, with structural parameters exhibiting systematic variation according to the ionic radius of the M−site cation. Electronic band structure analysis reveals insulating behavior in LiFePO₄ and LiMgPO₄ with wide band gap, while LiCoPO₄ and LiMnPO₄ are identified as wide-bandgap semiconductors, owing to transition metal 3d–O 2p hybridization. Optical studies demonstrate pronounced anisotropy in dielectric response and absorption spectra, with LiMgPO₄ exhibiting the highest absorption threshold. Spin-polarized calculations unveil high-spin magnetic configurations in transition-metal-based compounds, with total cell magnetic moments. Furthermore, hyperfine interaction analysis, including electric field gradients and magnetic shielding tensors, and highlights significant anisotropy effects, particularly for Fe2⁺ and Mn2⁺ centers. The quadrupole coupling constants (C_Q) and asymmetry parameters (η) provide insights into local symmetry breaking and electron density distribution around metal centers. This integrated computational approach underscores the tunability of LiMPO₄ compounds for next-generation lithium-ion battery cathodes and multifunctional materials with optoelectronic and magnetic properties.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"77 ","pages":"Article 108425"},"PeriodicalIF":4.6,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145048152","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}