Article
Physics, Multidisciplinary
A. M. S. Mahdy, Kh Lotfy, A. El-Bary, H. H. Sarhan
Summary: This study investigates a novel model in photo-thermoelasticity theory, analyzing the theoretical obtaining of the model for a semiconductor elastic medium in a rotation case and the interaction between main physical quantities during the photothermal transport process. Exact solutions are obtained for the main physical fields of semi-infinite semiconductor medium, and numerical studies are conducted on multi-phase-lags relaxation times in the presence of an external magnetic field.
EUROPEAN PHYSICAL JOURNAL PLUS
(2021)
Article
Physics, Multidisciplinary
A. M. S. Mahdy, Kh Lotfy, A. El-Bary, Ismail M. Tayel
Summary: The main goal of this work is to investigate the interaction impact between three propagated waves, focusing on the elastic wave, plasma wave and thermal waves within the context of the hyperbolic generalized two-temperature theory. The study examines the governing equations during the photothermal theory, exploring the impact of external magnetic field and laser pulse on a semiconductor medium's outer surface. Different models of photo-thermoelasticity theory are obtained through the coupling of photothermal theory and thermoelasticity theory, and integral transforms techniques are used in solving the equations.
EUROPEAN PHYSICAL JOURNAL PLUS
(2021)
Article
Optics
Yuhao Lei, Masaaki Sakakura, Lei Wang, Yanhao Yu, Huijun Wang, Gholamreza Shayeganrad, Peter G. Kazansky
Summary: Storing exponentially increasing data in the information age is a challenge. Multiplexed optical data storage offers high data density, low energy consumption, and long lifetime. Recent advancements in 5D optical data storage based on anisotropic nanostructures show potential for real-world applications, but high speed and density remain challenges. The proposed method for rapid and energy-efficient writing of anisotropic nanostructures in silica glass using energy modulated megahertz-rate fs pulses could lead to high-density data storage and fast information recording.
Article
Physics, Multidisciplinary
Ismail M. Tayel, Kh Lotfy
Summary: This work investigates the photothermal interaction in a semiconducting medium caused by laser radiation surface absorption within a theory that considers strain and temperature rate dependencies. The surface of the medium is assumed to be stress-free and exposed to a uniform laser beam. The general solution to the problem is obtained using the integral transform method, with the inverse transformation being computationally derived. Silicon material is used to analyze the consistency of the results from the novel model.
EUROPEAN PHYSICAL JOURNAL PLUS
(2021)
Article
Mathematics
Mohsen Fayik, Sharifah E. E. Alhazmi, Mohamed A. A. Abdou, Emad Awad
Summary: The present study estimates the thermal stress distribution and displacement vector inside a nano-thick infinite plate subjected to exponential boundary heating on the front surface. Three different models of thermal transport were considered, and their main features were analyzed. The derived expressions for thermal and mechanical wave speeds show that the modified hyperbolic dual-phase-lag model has the fastest thermal wave speed, while the Lord-Shulman model has the slowest thermal wave speed.
Article
Mechanics
Roger J. Hosking, Fausto Milinazzo
Summary: This study extends the results of Miles & Sneyd on a simple linear mathematical model for an accelerating line load on a floating ice plate by conducting numerical calculations for the response due to a decelerating load. The results show various relationships between load speeds and deflections, with significances in certain scenarios where deflections may increase significantly.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Thermodynamics
Lei Wang, Chuntong Liu, Zhili Zhang
Summary: This study investigates the laser ablation behavior of C/SiC materials under high flow velocity conditions. A numerical simulation approach is presented by integrating a hypersonic aerothermodynamics program with finite element analysis software. Modified ablation equations for C/SiC materials incorporate wall shear stress, local pressure, and dynamic pressure. The numerical simulations are validated through a series of C/SiC ablation experiments, with the 3.0 Ma and 6.0 Ma experiments showing better ablation prediction results.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Materials Science, Ceramics
Junyuan Feng, Xiaofang Huang, Shu Yang, Jianbo Qing, Peng Tang, Zhenping Wan
Summary: The study conducted scratch tests on BK7 under high-speed conditions, revealing the impact of thermal effect on ductile-brittle transition and scratch morphology. The changes in material removal behavior and crack initiation mechanism due to speed effect were also explained.
CERAMICS INTERNATIONAL
(2021)
Article
Multidisciplinary Sciences
Quansan Yang, Ziying Hu, Min-Ho Seo, Yameng Xu, Ying Yan, Yen-Hao Hsu, Jaime Berkovich, Kwonjae Lee, Tzu-Li Liu, Samantha McDonald, Haolin Nie, Hannah Oh, Mingzheng Wu, Jin-Tae Kim, Stephen A. Miller, Ying Jia, Serkan Butun, Wubin Bai, Hexia Guo, Junhwan Choi, Anthony Banks, Wilson Z. Ray, Yevgenia Kozorovitskiy, Matthew L. Becker, Mitchell A. Pet, Matthew R. MacEwan, Jan-Kai Chang, Heling Wang, Yonggang Huang, John A. Rogers
Summary: This article introduces a picosecond-pulsed laser-based scheme for manipulating eco/bioresorbable materials in advanced electronic systems. The technology allows for controlled patterning, thinning, and cutting of these materials, enabling the creation of unique and environmentally-friendly electronic devices.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Ceramics
Aoao Wang, Junjie Zhu, Chen Ma, Weiye Xu, Zhuang Ma, Lihong Gao, Guohua Chen, Hatsuo Ishida
Summary: High-energy continuous-wave lasers have been significant in recent decades for their ability to destroy materials rapidly, requiring protection. The study designed and prepared SiC/BPF-ZS composites with significant anti-laser performance, showing that the formation of a ceramic coating is key to improving reflectivity. SiC fibers play a crucial role in forming a high-reflectivity coating during laser ablation and outperform carbon fibers.
CERAMICS INTERNATIONAL
(2022)
Article
Optics
Francesc Bravo-Montero, David Castells-Rufas, Jordi Carrabina
Summary: This paper presents a system using a matrix of laser beams controlled by high-performance computing platform to overcome the speed bottleneck in laser marking. Industrial solutions presented in this paper can achieve higher speed and resolution for image printing on printing substrates. Further increase in speed is possible by investing in additional laser beams.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Mechanics
Shreen El-Sapa, Mohamed S. Mohamed, Kh Lotfy, A. M. S. Mahdy, A. El-Bary
Summary: This work introduces a novel model that describes the elastic-mechanical-thermodiffusion waves of semiconductor material. The model considers the interaction between holes and electrons when the material is exposed to laser pulses. The thermal conductivity is chosen as a function of temperature. The photothermal effect is obtained based on the temperature gradient. The one-dimensional deformation is used to explain the main governing equations. The solution of the fields is obtained algebraically using the Laplace transform, and the inversion of the transform is used to obtain solutions in real space-time domain. Numerical results and graphical comparisons are used to analyze the impact of laser pulses, variable thermal conductivity, and thermal memories.
Article
Engineering, Electrical & Electronic
Shuo Li, Zhanzhi Liu, Ailing Zhang, Honggang Pan, Radu-Florin Stancu, Yuanli Yue, Ruibo Zhang, Chao Wang
Summary: A novel microwave photonic approach is proposed and demonstrated for real-time and high-speed interrogation of optical fiber sensors. The method utilizes optical injection in a semiconductor laser and simple passive microwave frequency filtering. Experimental results show that high interrogation speed and measurement sensitivity have been achieved.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Young Chul Kim, Hoseong Yoo, Van Tu Nguyen, Soonil Lee, Ji-Yong Park, Yeong Hwan Ahn
Summary: In this study, a high-speed second-harmonic generation (SHG) imaging technique was used for in situ characterization of transition-metal dichalcogenide (TMD) monolayers and twisted bilayers. The SHG imaging allowed rapid identification of crystallinity, orientation, and homogeneity of the TMD with a speed of 1 frame/s. The research also revealed the SHG peak intensity and angles variation with the twist angle in twisted bilayer MoS2 under strong interlayer coupling, as well as the threshold behavior of laser-induced ablation in MoS2 monolayers and bilayers.
Article
Mechanics
J. S. Marshall, E. R. Johnson
Summary: This paper presents a closed-form analytical solution for steady, two-dimensional, inviscid, free-surface attached flow over a submerged planar hydrofoil for arbitrary angles of attack and depths of submergence, in the limit of large Froude number. The flow domain is mapped to an auxiliary plane using conformal mapping. The complex flow potential and its derivative, the complex velocity, are obtained by considering their form at known special points in the flow. The explicit form of the solution allows accurate evaluation of various flow quantities, including the lift on the foil, and comparison with recent numerical solutions.
JOURNAL OF FLUID MECHANICS
(2023)