Journal of Physics D: Applied Physics最新文献_第10页

Spatial shaping of low-and high-order harmonics generated using vortex beams 利用涡流束产生的高低阶谐波的空间整形

Journal of Physics D: Applied Physics Pub Date : 2024-04-25 DOI: 10.1088/1361-6463/ad4371

Naresh kumar Reddy Andra, V. V. Kim, Victor Kӓrcher, Helmut Zacharias, A. Bundulis, A. Sarakovskis, A. Atvars, A. Ubelis, R. A. Ganeev

{"title":"Spatial shaping of low-and high-order harmonics generated using vortex beams","authors":"Naresh kumar Reddy Andra, V. V. Kim, Victor Kӓrcher, Helmut Zacharias, A. Bundulis, A. Sarakovskis, A. Atvars, A. Ubelis, R. A. Ganeev","doi":"10.1088/1361-6463/ad4371","DOIUrl":"https://doi.org/10.1088/1361-6463/ad4371","url":null,"abstract":"\u0000 We demonstrate the generation of the low- and high-order harmonic vortex beams from a single spiral phase plate (SPP) illuminated by different laser wavelengths. The second harmonic (532 nm) originates from the application of the wavefront-structured 1064 nm femtosecond pulses with fractional orbital angular momentum during propagation through a lithium triborate crystal, while the third harmonic (500 nm) originates from the application of the wavefront-structured near-IR (1500 nm) femtosecond pulses with integer orbital angular momentum during propagation through a 150 µm thick fused silica plate. The topological charges of the second and third harmonics are measured and compared. The increase in topological charge and the peculiarities in orbital angular momentum variations during modification of the polarisation of the incident radiation are analyzed and discussed. The two-color-pump-driven second-harmonic vortex radiation interacted with an Ar gas jet to generate vortex harmonics up to the 14th order with double-lobe complex spatial profiles in the extreme ultraviolet region.","PeriodicalId":507822,"journal":{"name":"Journal of Physics D: Applied Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140655337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical Simulation of Electric Field-Induced Phase Transition Evolution and Boiling Characteristics in the Evaporative Cooling Medium C6F12O 蒸发冷却介质 C6F12O 中电场诱导的相变演化和沸腾特性的数值模拟

Journal of Physics D: Applied Physics Pub Date : 2024-04-25 DOI: 10.1088/1361-6463/ad436a

Shuangshuang Tian, Jiahao Wang, Yingyu Wu, Feng Hu, Yongchao Luo, Chaohai Zhang, Shen Gao, Zian Yuan

{"title":"Numerical Simulation of Electric Field-Induced Phase Transition Evolution and Boiling Characteristics in the Evaporative Cooling Medium C6F12O","authors":"Shuangshuang Tian, Jiahao Wang, Yingyu Wu, Feng Hu, Yongchao Luo, Chaohai Zhang, Shen Gao, Zian Yuan","doi":"10.1088/1361-6463/ad436a","DOIUrl":"https://doi.org/10.1088/1361-6463/ad436a","url":null,"abstract":"\u0000 Phase change cooling technology offers high cooling efficiency, safety, and reliability, representing a novel approach to achieving efficient heat dissipation for high-power and large-capacity electrical equipment. The formulation of the cooling medium is pivotal to phase change cooling technology. However, current media exhibit compatibility, stability, economy, and environmental friendliness deficiencies. Consideration could be given to implementing the C6F12O medium due to its superior overall performance and ability to meet the latent heat requirements in phase change cooling equipment. This paper employs a numerical simulation approach that combines the phase field method based on the Cahn-Hilliard equation with the theory of electrohydrodynamics. It investigates the impact of temperature, electric field intensity, and electric field direction on the evolution of bubble motion and the boiling state of the C6F12O medium, considering the interaction of electric-fluid-heat-phase fields. Numerical results indicate that the system undergoes initial nucleate boiling, nucleate boiling, and film boiling stages at T=330~335 K, T=335~350 K, and T≥355 K, respectively. The introduction of an appropriate electric field can enhance the motion evolution of C6F12O bubbles. However, attention must be paid to the formation of bubble channels under high field strength to prevent potential decreases in insulation performance. An inhomogeneous electric field in the vertical direction proves more effective in improving the bubble release rate compared to a uniform electric field. To some extent, an inhomogeneous electric field in the horizontal direction can prevent the mass accumulation of bubbles in regions of high field intensity. This research has the potential to offer theoretical guidance for the engineering application of the C6F12O phase change cooling medium.","PeriodicalId":507822,"journal":{"name":"Journal of Physics D: Applied Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140655785","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dual mode spin to charge conversion using inverse spin Hall effect in NiFe/FeMn/NiFe multilayer thin films 利用镍铁/锰铁/镍铁多层薄膜中的反自旋霍尔效应实现自旋与电荷的双模式转换

Journal of Physics D: Applied Physics Pub Date : 2024-04-24 DOI: 10.1088/1361-6463/ad42aa

Brahmaranjan Panigrahi, M. M. Raja, Chandrasekhar Murapaka, A. Haldar

{"title":"Dual mode spin to charge conversion using inverse spin Hall effect in NiFe/FeMn/NiFe multilayer thin films","authors":"Brahmaranjan Panigrahi, M. M. Raja, Chandrasekhar Murapaka, A. Haldar","doi":"10.1088/1361-6463/ad42aa","DOIUrl":"https://doi.org/10.1088/1361-6463/ad42aa","url":null,"abstract":"\u0000 Microwave devices with more than one operating frequency and their ease of tunability are of great importance for high-frequency information processing. Magnetic thin films offer an unparalleled advantage of engineering different microwave bands that can be precisely tailored and reconfigured externally. Here, novel trilayer structures consisting of NiFe/FeMn/NiFe with varying anti-ferromagnetic FeMn layer thickness have been investigated by exploring their ferromagnetic resonance (FMR) properties and inverse spin Hall effect (ISHE) responses. Two-step magnetic hysteresis loops are observed for higher FeMn thickness (t ≥ 12 nm), where the bottom NiFe layer shows a comparatively more significant shift due to the presence of strong interfacial exchange coupling. FMR study reveales two resonant modes associated with the two ferromagnetic layers, which are distinguishable for higher thicknesses of FeMn or at high excitation frequencies. The choice of FeMn thickness determines the operating frequencies, which can be finely tailored by optimizing the FeMn thickness. Gilbert damping parameter is found to be in the range of 0.009 - 0.012 where the presence of exchange bias adds to the the scattering mechanisms. Prominent ISHE responses are obtained from the bottom NiFe layer as compared to the top NiFe layer. Variation of FeMn thickness also shows a strong influence on the spin pumping (Vsp), and perpendicular anisotropic magnetoresistance (VAMR⊥) components. The results are correlated with the efficiency of spin flow and spin-to-charge conversion of the FeMn layer. Our systems can be used as an emerging alternative for microwave detectors and microwave energy harvesters.","PeriodicalId":507822,"journal":{"name":"Journal of Physics D: Applied Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140660124","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Cycle-to-cycle Switching Endurance Variability in Vertically Aligned Nanocrystalline Molybdenum Disulﬁde: Computational Insights 垂直排列纳米晶钼二硫化物的周期切换耐久性变异：计算见解

Journal of Physics D: Applied Physics Pub Date : 2024-04-24 DOI: 10.1088/1361-6463/ad42a8

Aykut Turfanda, H. Ünlü

引用次数: 0

In situ growth of Ag nanoparticles on the surface of MXene by γ-ray irradiation to fabricate EVA composite: The improvement of flame retardancy, smoke suppression, and mechanical properties 通过γ射线辐照在 MXene 表面原位生长 Ag 纳米粒子，制造 EVA 复合材料：阻燃性、抑烟性和机械性能的改善

Journal of Physics D: Applied Physics Pub Date : 2024-04-24 DOI: 10.1088/1361-6463/ad42ab

Siyi Xu, Danyi Li, Wenrui Wang, Lin Lin, Ying Sun, Jihao吉豪 Li李, Linfan Li

{"title":"In situ growth of Ag nanoparticles on the surface of MXene by γ-ray irradiation to fabricate EVA composite: The improvement of flame retardancy, smoke suppression, and mechanical properties","authors":"Siyi Xu, Danyi Li, Wenrui Wang, Lin Lin, Ying Sun, Jihao吉豪 Li李, Linfan Li","doi":"10.1088/1361-6463/ad42ab","DOIUrl":"https://doi.org/10.1088/1361-6463/ad42ab","url":null,"abstract":"\u0000 A large amount of toxic smoke and heat generated by the combustion of ethylene vinyl acetate copolymer (EVA) poses a significant threat to human fire escape evacuation. This work aims to use γ-ray to prepare e-MXene@Ag hybrid flame-retardant materials by the method of in-situ reduction, and EVA composites are prepared by melt blending to reduce the smoke and toxic gases produced during combustion significantly. Compared with pure EVA, the total heat release, total smoke release, and the production rate of CO and CO2 produced by the combustion of EVA composite with 1wt% e-MXene@Ag1.0 decreased by 30.3%, 33.3%, 18.2%, and 20.1% respectively, while the content of residue increased by 907.4%. The fire hazard reduction of EVA composite materials was due to the physical barrier, catalytic carbonization and adsorption of the e-MXene@Ag1.0 hybrid. In addition, e-MXene@Ag1.0 can also further increase the mechanical properties of EVA composites due to its own \"multi-contact point limit structure.\"","PeriodicalId":507822,"journal":{"name":"Journal of Physics D: Applied Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140660006","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Role of gas composition in weakened nonlinear standing wave excitation and improved plasma radial uniformity in very-high-frequency asymmetric capacitive Ar/CF4 discharges 气体成分在削弱非线性驻波激励和改善超高频非对称电容性 Ar/CF4 放电等离子体径向均匀性中的作用

Journal of Physics D: Applied Physics Pub Date : 2024-04-22 DOI: 10.1088/1361-6463/ad4163

Fang-Jie Zhou, Yu-Ru Zhang, Kai Zhao, D. Wen, You-Nian Wang

{"title":"Role of gas composition in weakened nonlinear standing wave excitation and improved plasma radial uniformity in very-high-frequency asymmetric capacitive Ar/CF4 discharges","authors":"Fang-Jie Zhou, Yu-Ru Zhang, Kai Zhao, D. Wen, You-Nian Wang","doi":"10.1088/1361-6463/ad4163","DOIUrl":"https://doi.org/10.1088/1361-6463/ad4163","url":null,"abstract":"\u0000 The higher harmonics generated by nonlinear sheath motion would enhance the standing wave effect, and thus lead to center-peaked plasma density profile in very-high-frequency (VHF) capacitive discharges. In this work, a nonlinear transmission line (NTL) model introduced in [Zhou et al. Plasma Sources Sci. Technol. 30 125017 (2021)] has been extended, with radial transport of various particles and nonlinear sheath motion into account, to investigate the effects of CF4 fraction α on the nonlinear standing wave excitation and plasma radial uniformity in VHF (60 MHz) capacitively coupled Ar/CF4 plasmas at 3 Pa. The results indicate that for pure Ar discharges (i.e. α=0%), the nonlinearly excited harmonics with short wavelength significantly enhance the electron power absorption at the radial center, resulting in a pronounced central-high plasma density profile. As α increases, the high-order harmonics are gradually damped due to the increase of resistance, as well as the longer wavelength caused by thicker sheath thickness. Thus, the radial profile of the electron absorbed power density shifts from center-peak to edge-high. Besides, at the radial center, the electron density and Ar+ ion density decrease with α, CF3+ ion density shows an increasing trend, while F- ion density initially rises and then decreases. Moreover, the density profiles of all the species become more uniform at higher α, due to the suppressed nonlinear standing wave excitation and the longer wavelength of the nonlinear harmonics.","PeriodicalId":507822,"journal":{"name":"Journal of Physics D: Applied Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140673438","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A dynamic phase separation model for glass transition behavior in water-triggered shape memory polymer towards programmable recovery onset 水触发形状记忆聚合物玻璃转变行为的动态相分离模型，实现可编程恢复起始点

Journal of Physics D: Applied Physics Pub Date : 2024-04-22 DOI: 10.1088/1361-6463/ad4162

Jiabin Shi, Haibao Lu, Tengfei Zheng, Yong-Qing Fu

{"title":"A dynamic phase separation model for glass transition behavior in water-triggered shape memory polymer towards programmable recovery onset","authors":"Jiabin Shi, Haibao Lu, Tengfei Zheng, Yong-Qing Fu","doi":"10.1088/1361-6463/ad4162","DOIUrl":"https://doi.org/10.1088/1361-6463/ad4162","url":null,"abstract":"\u0000 Water-triggered shape memory polymers (SMPs) have been extensively studied for biomedical applications due to their advantages of non-thermal actuation capability. However, few studies have been carried out to explore the working principle of shape recovery onset, which is essentially determined by the complex reactions between polymer macromolecules and water molecules. In this study, we developed a phase separation model to describe the dynamic glass transition in water-triggered SMPs. Based on the phase transition theory, dense and dilute phase separations of polymer macromolecules can be achieved when the dynamic diffusions of water molecules in the SMPs undergo dehydration and absorption processes, respectively. Then, the dynamic glass transition is resulted from the dehydration and absorption of water molecules, leading to the dense and dilute phases in the SMPs. Therefore, a free-energy equation has been developed to characterize the recovery onset, in which the mixing free energy and elastic free energy are originated from the Flory-Huggins solution theory and phase separation model, respectively. Moreover, the glass transition and its connection to shape recovery behaviors, i.e., recovery ratio, relaxation time and dynamic mechanical modulus, have also been investigated, according to the Fick’s diffusion law. Meanwhile, onset of programmable recovery has been explained by the dynamic phase separation, based on the transpiration theory and permeability model. Finally, the proposed model is verified using the experimental results reported in the literature. This study is expected to provide a fundamental approach to formulate the constitutive relationship between the dynamic phase separation and programmable recovery onset in the water-triggered SMPs.","PeriodicalId":507822,"journal":{"name":"Journal of Physics D: Applied Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140675525","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

External Defect Immune High Quality Resonances in Microwave Topological Ring Resonator 微波拓扑环谐振器中的外部缺陷免疫高质量共振

Journal of Physics D: Applied Physics Pub Date : 2024-04-22 DOI: 10.1088/1361-6463/ad4159

Geetanjali Jena, Gopal Kulkarni, Ravi Varshney, Dibakar Roy Chowdhury

{"title":"External Defect Immune High Quality Resonances in Microwave Topological Ring Resonator","authors":"Geetanjali Jena, Gopal Kulkarni, Ravi Varshney, Dibakar Roy Chowdhury","doi":"10.1088/1361-6463/ad4159","DOIUrl":"https://doi.org/10.1088/1361-6463/ad4159","url":null,"abstract":"\u0000 Recently, topological ring resonators (TRRs) have emerged as a burgeoning platform for exploring the topological aspects of photonic systems and resonator dynamics. Integrating topology into cavity dynamics offers a new paradigm to unveil various fascinating phenomena, including backscattering immune wave propagation, unidirectional transmission, and reflection-free energy transport. With this background, we provide a scheme to achieve robust high Q resonances in a metal-based topological photonic crystal (TPC) exhibiting defect-immune spectral characteristics in the microwave frequency regime. Coupled with a ring resonator, our proposed topological platform demonstrates the excitation of high Q resonances in the range 230-540. Except for the resonances, a robust microwave transmission (~0 dB) is observed in the investigated frequency regime 7.1-7.6 GHz, depicting a minimal scattering loss even around the sharp corners of the ring resonator. Further, the topological robustness of the propagating microwave and the excited resonances are examined by introducing an external Si obstacle at the domain interface. Our study reveals a minimal transmission loss (<7 dB) and negligible perturbation (<8%) in the Q factors when the Si barrier placed towards the input end of the straight topological waveguide. In addition, we have also demonstrated a novel way of exciting new resonances in the ring resonator that holds considerable promise for designing a TRR-based all-pass notch filter in the microwave regime.","PeriodicalId":507822,"journal":{"name":"Journal of Physics D: Applied Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140675551","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A versatile method for the exploration of magnetooptical properties of polar saturated and unsaturated ferromagnetic metallic thin films 探索极性饱和与不饱和铁磁金属薄膜磁光特性的多功能方法

Journal of Physics D: Applied Physics Pub Date : 2024-04-22 DOI: 10.1088/1361-6463/ad415c

Rajkumar Patra, Apoorva Sharma, Hartmut Stöcker, M. Monecke, G. Salvan, Roland Mattheis, Heidemarie Schmidt

引用次数: 0

Electronic properties of polyethylene naphthalate as derived from photo-stimulated discharge, luminescence experiments and quantum chemical calculation 通过光刺激放电、发光实验和量子化学计算得出的聚萘二甲酸乙二醇酯的电子特性

Journal of Physics D: Applied Physics Pub Date : 2024-04-22 DOI: 10.1088/1361-6463/ad415b

Duvan Mendoza Lopez, Gilbert Teyssedre, L. Boudou, L. Berquez, Christian Laurent, Shinya Iwata, Tatsuo Takada

{"title":"Electronic properties of polyethylene naphthalate as derived from photo-stimulated discharge, luminescence experiments and quantum chemical calculation","authors":"Duvan Mendoza Lopez, Gilbert Teyssedre, L. Boudou, L. Berquez, Christian Laurent, Shinya Iwata, Tatsuo Takada","doi":"10.1088/1361-6463/ad415b","DOIUrl":"https://doi.org/10.1088/1361-6463/ad415b","url":null,"abstract":"\u0000 The electronic properties of thin films of Poly(ethylene 2,6-naphthalate) –PEN, are investigated based on their photo-physical (optical absorption, photoluminescence) and electrical (space charge distribution, photo-stimulated discharge) behavior. Photo-stimulated currents are associated with optical absorption of the material leading to space charge dissipation as demonstrated by space charge distribution measurement. Based on this set of experimental results and quantum chemical calculation performed on PEN macromolecular system, we propose a new scheme for the electronic levels of PEN. This scheme allows understanding the mechanisms at play in photo-stimulated discharge. One of the main conclusions of our work is that photo-stimulated current measurements do not probe the energy level of traps. Detrapping of charges results from a two-step process where the photon energy is absorbed by chromophores that restitute a part of this energy to trapped charges through various mechanisms. Moreover, the new scheme allows discussing the components of the luminescence excited under different stresses, being electric field, electronic and UV irradiation, charge recombination and thermal activation.","PeriodicalId":507822,"journal":{"name":"Journal of Physics D: Applied Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140674365","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0