Article
Materials Science, Multidisciplinary
Aofei Mao, Peixun Fan, Loic Constantin, Nan Li, Xi Huang, Bai Cui, Jean-Francois Silvain, Xinwei Wang, Yong Feng Lu
Summary: This study presents an approach to transform 2D patterns into 3D geometries using distributed stress inside a polymer. By introducing controlled stress fields, various shape transformations can be achieved during 2D printing. This method offers a unique way to fabricate complex 3D nanostructures.
APPLIED MATERIALS TODAY
(2022)
Article
Multidisciplinary Sciences
Aleksander Kubica, Michael Vasmer
Summary: This article introduces a new topological quantum error-correcting code, the three-dimensional subsystem toric code (3D STC), which can be implemented with geometrically-local parity checks and has a high threshold and local parity-check measurements, making it suitable for fault-tolerant quantum computing.
NATURE COMMUNICATIONS
(2022)
Article
Mechanics
Tatsujiro Miyazaki, Takahiro Fujiwara, Nao-Aki Noda, Yoshikazu Sano
Summary: This study analyzed the three-dimensional singularity index at the interface corner and found that the ratio of the singularity index falls within the range of 0.85 to 1.15 for all material combinations. By comparing the conditions in two-dimensional and three-dimensional cases, the criteria for the appearance of stress singularity at the interface corner were clarified.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2021)
Article
Chemistry, Physical
Jeong-Won Lee, Kihwan Kim, Giwon Ryoo, Jisu Kim, Jeyaraj Vinoth Kumar, Woonbong Hwang
Summary: A new SHPo/SHPi patterning method for three-dimensional objects using aluminum was proposed in this study, achieving successful realization of patterned surfaces with contact angles of 10 degrees for SHPi surface and 160 degrees for SHPo surface. This method enables patterning even in areas that laser light cannot reach, expanding the application scope of SHPo/SHPi surface patterning technique.
APPLIED SURFACE SCIENCE
(2022)
Article
Engineering, Multidisciplinary
Youkou Dong, Lan Cui, Xue Zhang
Summary: The material point method (MPM) is an arbitrary Lagrangian-Eulerian method with intrinsic advantages in simulation of large deformation problems. This paper proposes a new multiple-GPU parallel strategy based on a single-root complex architecture, which achieves computation acceleration through peer-to-peer communication and domain decomposition.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING
(2022)
Article
Cell Biology
Lei Chen, Weihuan Cao, Rohit Aita, Dennis Aldea, Juan Flores, Nan Gao, Edward M. Bonder, Christopher E. Ellison, Michael P. Verzi
Summary: In renewing tissues like the intestinal epithelium, enhancer-promoter interactions remain relatively stable despite dynamic gene regulation across the differentiation axis. HNF4 transcription factors are found to be essential for chromatin looping at target genes, with depletion of HNF4 disrupting local chromatin looping, histone modifications, and target gene expression. This study offers insights into the transcriptional regulatory mechanisms governing homeostasis in renewing tissues.
Article
Mechanics
GuangYing Liu, Ran Guo, KuiYu Zhao, MingSan Chen, DiHeng Wu
Summary: This paper proposes a new numerical calculation method for three-dimensional problems, which uses a three-dimensional arbitrary polyhedron element based on the hybrid stress element method. The effectiveness and efficiency of the proposed method are verified through verification and simulation.
COMPOSITE STRUCTURES
(2023)
Article
Multidisciplinary Sciences
Guang Song
Summary: The study establishes a connection between the modulus of elasticity of proteins and molecular interactions by predicting the magnitude of thermal vibrations. It shows that the Young's moduli of proteins are typically in the range of a few Gpa to 10 Gpa, while the interface regions are much smaller. This work is significant as it is the first attempt to systematically compute the elastic moduli of proteins based on molecular interactions.
Article
Optics
David Blinder, Takashi Nishitsuji, Peter Schelkens
Summary: In this study, we propose a new algorithm for computing computer-generated holography (CGH) for arbitrary 3D curves using splines. Compared to previous solutions, which only drew planar curves, our algorithm achieves high efficiency and can generate real-time 4K holographic videos of complex 3D curved objects.
Article
Materials Science, Multidisciplinary
Wenchao Jin, Hui Guo, Pei Sun, Yansong Wang, Tao Yuan
Summary: This study investigates the differences in band structures of 2D and 3D acoustic metamaterials, analyzing periodic lattice structures and using finite element methods to verify and explain the discrepancies. The findings provide some assistance for computing the band structure of 2D AMMs for practical applications.
FRONTIERS IN MATERIALS
(2021)
Article
Engineering, Marine
Dianyong Liu, Chen Liang, Xiao Liang
Summary: The interactions between weakly three-dimensional waves in an 'X' configuration with a 16-degree approaching angle were studied through laboratory experiments and numerical simulations. The experimental results showed an increase in wave height as the wave trains propagated into the interaction region, reaching a maximum height of about 1.37H0. The wave elevations at different positions downstream of the interaction region were also highly correlated with the frequency and initial wave steepness. For low frequency waves, a crescent wave surface formed at the beginning of the interaction and separated into two two-dimensional waves, while for high frequency waves, three-dimensional effects dominated the interaction. Numerical simulations with larger approaching angles further demonstrated the influence of propagation direction on the interactions between weakly three-dimensional waves.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Computer Science, Interdisciplinary Applications
Mack Kenamond, Dmitri Kuzmin, Mikhail Shashkov
Summary: This paper presents a new intersection-distribution-based remapping method for hydrodynamics simulation between different polygonal meshes. By conservatively remapping mass and momentum using intersections between source and target meshes, the method aims to improve accuracy and flexibility in the simulation process.
JOURNAL OF COMPUTATIONAL PHYSICS
(2021)
Article
Computer Science, Interdisciplinary Applications
Everton Fernandes Silva, Hatice Calik, Wim Vancroonenburg, Aline Aparecida Souza Leao, Tony Wauters
Summary: The problem of extracting maximal objects from three-dimensional materials is studied using mathematical models and a matheuristic approach for both general and special cases. Computational experiments evaluate the performance and efficiency of the models for small-scale instances, considering objects with varying numbers of vertices. Benchmark instances are publicly available for future research.
COMPUTERS & OPERATIONS RESEARCH
(2021)
Article
Physics, Multidisciplinary
Xue Jiang, JiaJie He, ChuanXin Zhang, HuaLiang Zhao, WeiQi Wang, DeAn Ta, Cheng-Wei Qiu
Summary: This study proposes a method for three-dimensional ultrasound focusing using a sparse metalens, achieving subwavelength resolution within a wide bandwidth. The sparse metalens has advantages such as three-dimensional freewheeling focusing, subwavelength resolution, and geometric simplicity, providing new possibilities for research and applications in ultrasound focusing.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2022)
Article
Mechanics
R. C. Batra
Summary: The study delves into controlling the mechanical properties of materials under different conditions, highlighting the importance of utilizing stress components to maximize material performance. Analyzing the behavior of FG and linearly elastic beams under three-dimensional flexural deformations reveals the influence of Young's modulus distribution on beam performance under certain conditions.
COMPOSITE STRUCTURES
(2021)
Article
Physics, Applied
Mohammed Benzaouia, Alexander Cerjan, Steven G. Johnson
APPLIED PHYSICS LETTERS
(2020)
Article
Physics, Applied
Ying Pan, Rasmus E. Christiansen, Jerome Michon, Juejun Hu, Steven G. Johnson
Summary: Surface-enhanced Raman spectroscopy (SERS) is a powerful sensing method with the potential to detect single molecules, and topology optimization (TopOpt) can be used to design SERS substrates adhering to realistic fabrication constraints. By relaxing the fabrication minimum-feature-size constraint, TopOpt can be used to design SERS substrates with orders of magnitude larger enhancement factors. The results validate topology optimization as an effective method for engineering optimized SERS nanostructures adhering to fabrication limitations.
APPLIED PHYSICS LETTERS
(2021)
Article
Optics
Alec M. Hammond, Ardavan Oskooi, Steven G. Johnson, Stephen E. Ralph
Summary: This study presents a unified density-based topology optimization framework for optimizing integrated photonic designs for manufacturing constraints such as minimum area, minimum enclosed area, linewidth, linespacing, and curvature. Differentiable morphological transforms are utilized to create devices that are robust to etching issues and meet manufacturing constraints.
Article
Physics, Applied
Fan Wang, Steven G. Johnson, Henry O. Everitt
Summary: The performance of powerful tunable narrow-band continuous-wave terahertz radiation lasers heavily relies on molecular collision physics, pump saturation, and laser cavity design. An optimized laser cavity can produce tens of milliwatts of power tunable over frequencies above 1 THz when pumped by a multiwatt QCL.
PHYSICAL REVIEW APPLIED
(2021)
Article
Optics
Alec M. Hammond, Ardavan Oskooi, Mo Chen, Zin Lin, Steven G. Johnson, Stephen E. Ralph
Summary: We present a photonics topology optimization (TO) package that can address a wide range of practical photonics design problems. The package incorporates robustness and manufacturing constraints and can scale to large devices and massive parallelism. It employs a hybrid algorithm that solves multiple frequency-domain TO problems using a mature time-domain (FDTD) package and is enhanced by new filter-design sources and material-interpolation methods.
Article
Mechanics
I. Shukla, F. Wang, S. Mowlavi, A. Guyomard, X. Liang, S. G. Johnson, J. -c. Nave
Summary: Recent research has shown that feeding a silicon-in-silica coaxial fiber into a flame can result in the formation of silicon spheres with size controlled by feed speed. A reduced model to predict droplet size from feed speed has been derived, but quantitative validation has been challenging due to experimental uncertainties in parameter values and temperature profile. In this study, the reduced model was validated through three-dimensional simulations, showing excellent agreement across a range of feed speeds and constant capillary numbers at breakup location. This low-cost model is a useful tool for designing future experiments.
Article
Optics
Zin Lin, Raphael Pestourie, Charles Roques-Carmes, Zhaoyi Li, Federico Capasso, Marin Soljacic, Steven G. Johnson
Summary: We introduce end-to-end inverse design for multi-channel imaging, which involves optimizing a nanophotonic frontend and an image-processing backend to extract depth, spectral, and polarization channels from a single monochrome image. We demonstrate that subwavelength-scale metasurface designs can easily distinguish similar wavelength and polarization inputs, unlike diffractive optics. Our proposed technique combines a single-layer metasurface frontend with an efficient Tikhonov reconstruction backend, requiring only a grayscale sensor. Through spontaneous demultiplexing, our method achieves multi-channel imaging by separating different channels into distinct spatial domains on the sensor. We present large-area metasurface designs for multi-spectral imaging, depth-spectral imaging, and all-in-one spectro-polarimetric-depth imaging, demonstrating robust reconstruction performance.
Article
Physics, Applied
Mohammed Benzaouia, John D. Joannopoulos, Steven G. Johnson, Aristeidis Karalis
Summary: This study presents general analytical criteria for designing standard filters and demonstrates the method of designing filter devices through specific unitary coupling ratios. By solving a nonlinear optimization problem, filter design can be achieved, with a focus on elliptic filters for optimal performance.
PHYSICAL REVIEW APPLIED
(2022)
Article
Optics
Wenjie Yao, Francesc Verdugo, Henry O. Everit, Rasmus E. Christiansen, Steven G. Johnson
Summary: We propose a general framework for inverse design of nanopatterned surfaces that maximize surface-enhanced Raman spectra from randomly distributed molecules. Our optimized structures outperform coating with optimized spheres or bowtie structures by about 4 and 20 times, respectively, when considering nonlinear damage effects.
Article
Computer Science, Interdisciplinary Applications
Giuseppe Romano, Steven G. Johnson
Summary: In this study, a methodology for density-based topology optimization of non-Fourier thermal transport in nanostructures is introduced. It utilizes adjoint-based sensitivity analysis of the phonon Boltzmann transport equation (BTE) and a novel material interpolation technique called the transmission interpolation model (TIM). The approach is able to handle the interplay between real- and momentum-resolved material properties by parameterizing the material density with an interfacial transmission coefficient. This methodology allows for the systematic optimization of materials for heat management and conversion, as well as the design of devices where diffusive transport is not valid.
STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION
(2022)
Article
Optics
Mohammed Benzaouia, A. D. Stone, Steven G. Johnson
Summary: In this study, a general analysis is presented for finding and characterizing nonlinear exceptional point (EP) lasers above threshold. The stability of the EP laser is confirmed through numerical analysis, and a new method for characterizing the EP laser is proposed.
Article
Optics
Sophie Fisher, Raphael Pestourie, Steven G. Johnson
Summary: This study presents a semianalytical framework for computing the coupling of radiative and guided waves in slowly varying surfaces. It fills the gap in current approximate methods by allowing the modeling of their coupling using a combination of two methods.
Article
Physics, Multidisciplinary
Lu Lu, Raphael Pestourie, Steven G. Johnson, Giuseppe Romano
Summary: This paper proposes a multifidelity neural operator based on deep neural networks, which can reduce the demand for high-fidelity data and achieve smaller errors in solving heat transport problems. By combining with genetic algorithms and topology optimization, it enables fast solvers and inverse design for the phonon Boltzmann transport equation (BTE).
PHYSICAL REVIEW RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Yi-Xin Sha, Bo-Yuan Liu, Hao-Zhe Gao, Heng-Bin Cheng, Hai-Li Zhang, Ming-Yao Xia, Steven G. Johnson, Ling Lu
Summary: The iterative Green's function based on cyclic reduction of block-tridiagonal matrices is an ideal algorithm to compute the surface density of states of semi-infinite topological electronic materials. This method is applied to photonic and acoustic crystals using finite-element discretization and a generalized eigenvalue formulation to calculate the local density of states on a single surface of semi-infinite lattices. Three-dimensional examples of gapless helicoidal surface states in Weyl and Dirac crystals are shown, and the computational cost, convergence, and accuracy are analyzed.
Article
Physics, Multidisciplinary
Mohammed Benzaouia, John D. Joannopoulos, Steven G. Johnson, Aristeidis Karalis
Summary: Researchers have developed a quasi-normal mode theory for calculating a system's scattering S matrix, which simultaneously satisfies energy conservation and reciprocity. This practical reduced-order model is based on resonant frequencies and constant mode-to-port coupling coefficients, and can easily compute and describe various electromagnetic metasurfaces' Fano resonant phenomena.
PHYSICAL REVIEW RESEARCH
(2021)