Article
Materials Science, Multidisciplinary
Lei Zhu, Liao Sun, Xiaoyang Wang, Nan Li
Summary: This paper presents a new framework for optimizing three-dimensional hierarchical structures with tailored relative densities and anisotropy of lattice metamaterials. Numerical homogenization and artificial neural network based surrogate models are used to achieve the optimization, showing that tailored anisotropic lattice metamaterials outperform traditional topology optimization and quasi-isotropic lattice meta materials in structural efficiency.
MATERIALS & DESIGN
(2021)
Article
Physics, Applied
Nikhil Jrk Gerard, Mourad Oudich, Zhenpeng Xu, Desheng Yao, Huachen Cui, Christina J. Naify, Alec Ikei, Charles A. Rohde, Xiaoyu (Rayne) Zheng, Yun Jing
Summary: This study introduces a class of elastic metamaterials that can achieve low-frequency band gaps with a volume fraction as low as 3%, despite very low mass densities. The design relies on a 3D trampolinelike mode behavior to produce wide, omnidirectional, and low-frequency band gaps for elastic waves. This innovative approach has potential applications in areas where lightweight and vibration control are desired.
PHYSICAL REVIEW APPLIED
(2021)
Article
Engineering, Environmental
Siqi Wu, Xin Hua, Baiwen Ma, Hongwei Fan, Rui Miao, Mathias Ulbricht, Chengzhi Hu, Jiuhui Qu
Summary: The research indicates that membrane fouling is influenced by interactions between proteins, humic substances, and polysaccharides in natural organic matter mixtures. Different combinations of substances lead to varying cake layer structures, impacting membrane flux and fouling resistances.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Zhongyin Xiao, Qidi Xu, Chuan Li
Summary: A tunable, broadband metamaterial bandpass filter based on a three-dimensional structure was designed in this paper, which improves the out-of-band attenuation problem of traditional filters and has two transmission zeros with good out-of-band attenuation.
JOURNAL OF ELECTRONIC MATERIALS
(2021)
Article
Physics, Multidisciplinary
Zhaoxian Su, Wenlong Gao, Bingyi Liu, Lingling Huang, Yongtian Wang
Summary: In this study, an acoustic metamaterial with Dirac points is demonstrated by designing the sign of coupling terms. The transition from 3D Dirac point to Weyl points can be obtained by tuning the coupling parameter along the longitudinal direction. The negative coupling is realized by inserting additional off-resonant sites, which results in a four-band crossing point and helicoid surface states.
NEW JOURNAL OF PHYSICS
(2022)
Article
Chemistry, Physical
Fangyi Li, Qiang Zhang, Huimin Shi, Zheng Liu
Summary: This study investigates the mechanical properties of a three-dimensional negative-Poisson-ratio metal metamaterial lattice structure with a modified star structure. The stability and stiffness of the modified structures are found to be improved compared to the control structure, while stability decreases with increasing star body angle. The experimental results are consistent with the finite element simulation.
Review
Mechanics
Datta V. Gaitonde, Michael C. Adler
Summary: Advances in measuring and understanding 2D shock-wave/turbulent-boundary-layer interactions have led to a focus on 3D STBLI, which display greater configuration diversity. Semi-infinite interactions exhibit a conical asymptotic behavior where specifics of the shock-generator become insignificant.
ANNUAL REVIEW OF FLUID MECHANICS
(2023)
Article
Crystallography
Xinsa Zhao, Guodong Hao, Yu Shang, Jianning Han
Summary: Conventional acoustic systems have difficulty in sensing weak acoustic fault signals in complex mechanical vibration environments. To address this issue, a three-dimensional device, coupling gradient acoustic metamaterials (GAM) with phononic crystals (GAM-PC), is proposed in this paper. The strong wave compression effect coupled with the phononic crystal equivalent medium mechanism is utilized to enhance the perception of weak acoustic signals at the target frequency. Numerical simulations and experiments verify the superior amplification capability of the GAM-PC structure for loud signal amplitudes. Additionally, the GAM-PC structure has a narrower bandwidth per slit, making it more frequency selective, and it can separate different frequency components. This work is expected to be applied in signal monitoring in environments with strong noise.
Article
Materials Science, Multidisciplinary
Junjie Yang, Ali Rida, Yejun Gu, Daniel Magagnosc, Tamer A. Zaki, Jaafar A. El-Awady
Summary: An analytical solution for the displacement field of non-uniformly moving Volterra dislocations is derived using the Green's function approach. The strain and stress fields can be evaluated by numerically differentiating the displacement field. The analytical solution captures features including the plane waves during the injection process of dislocations.
Article
Mechanics
Qiang Zhang, Fangyi Li, Dachang Zhu, Hongxin Wang
Summary: This paper presents a new design for a three-dimensional compression-torsion mechanical metamaterial based on the three-period minimal surface (TPMS) theory. This design concept shows superior torsion performance and a negative Poisson's ratio (NPR) effect compared to previous structures. The findings have significant implications for smart devices, aerospace engineering, and conservation engineering applications.
COMPOSITE STRUCTURES
(2023)
Article
Physics, Multidisciplinary
Dario Cortese, Kirsty Y. Wan
Summary: This study demonstrates that the rolling motion of the biflagellate Chlamydomonas reinhardtii during swimming is derived from a nonplanar flagellar beat pattern, and a 3D model is constructed to explain this phenomenon. It is found that helical swimming requires further symmetry breaking between the two flagella, which is crucial for phototactic responses.
PHYSICAL REVIEW LETTERS
(2021)
Article
Mechanics
Jian Gao, Karuna Agarwal, Joseph Katz
Summary: The study utilized microscopic dual-view tomographic holography to measure the three-dimensional flow structures around a pair of roughness cubes embedded in a turbulent channel flow. The flow features included a horseshoe vortex, a vortical canopy, arch-like vortex, and interacting streamwise vortices.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Engineering, Multidisciplinary
Wenxiang Sun, Wenzhen Qu, Yan Gu, Shengdong Zhao
Summary: This paper introduces a meshless collocation method for 2D and 3D transient elastodynamic problems. The method combines the generalized finite difference method (GFDM) with the Houbolt scheme to transform the coupled equilibrium equations into static equations at time nodes. The GFDM with second-order and fourth-order expansions is then used to solve the static equations and obtain the solution.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2023)
Article
Nanoscience & Nanotechnology
Kaelyn Leake, Jose Martinez, Alexander Stensland, Hank Yochum
Summary: This paper introduces a novel modification to the traditional layer by layer process, adding three-dimensional control to the technique. By irradiating the substrate with laser light during the polycation and/or polyanion dipping cycles, polymer thin films with controlled thicknesses can be fabricated. The results show that the laser modification method can alter the height and absorbance of the thin films.
Article
Mechanics
X. Y. Jiang, D. W. Gu, C. B. Lee, C. R. Smith, P. F. Linden
Summary: The study explores the laminar-turbulent transition in boundary layers by investigating the evolution of flow structures from 3-D waves to Lambda-vortices. Through numerical simulations of K-regime and bypass transitions, the process of wave-warping and vortex dynamics is examined. The research suggests that adverse pressure gradient conditions lead to a more rapid evolution and stronger viscous-inviscid interaction, ultimately resulting in the development of high-shear layers and warped wave fronts.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Optics
Anna Theodosi, Odysseas Tsilipakos, Costas M. Soukoulis, Eleftherios N. Economou, Maria Kafesaki
Summary: Graphene is a promising material for nonlinear applications in the THz regime due to its high third order nonlinearity and ability to support surface plasmons. In this study, 2D-patterned graphene-patch metasurfaces are investigated for efficient third harmonic generation. The efficiency is enhanced by aligning the fundamental and third harmonic frequencies with the metasurface resonances, achieved through 2D-patterning that modifies the dispersion of plasmons. High efficiencies of -20dB (1%) for input intensity 0.1 MW/cm(2) are achieved, and the results demonstrate the potential of graphene-based metasurfaces for nonlinear applications.
Article
Nanoscience & Nanotechnology
George Perrakis, Anna C. Tasolamprou, George Kenanakis, Eleftherios N. Economou, Stelios Tzortzakis, Maria Kafesaki
Summary: Solar cell technology requires efficient, lightweight, and stable materials. Researchers have designed a compatible and novel organic-inorganic hybrid radiative cooling coating/scheme that decreases the cell temperature and increases the power conversion efficiency, paving the way for next-generation, stable and efficient, ultralightweight solar cells.
Article
Nanoscience & Nanotechnology
Anastasios D. Koulouklidis, Anna C. Tasolamprou, Spyros Doukas, Eudokia Kyriakou, M. Said Ergoktas, Christina Daskalaki, Eleftherios N. Economou, Coskun Kocabas, Elefterios Lidorikis, Maria Kafesaki, Stelios Tzortzakis
Summary: In this study, a thin film graphene-based terahertz perfect absorbing device is presented, which allows modulation of absorption and phase characteristics through terahertz self-actions. The experimental results show significant absorption modulation and phase modulation when the device is illuminated with terahertz field strengths. Theoretical analysis reveals that the terahertz-induced heating of graphene's carriers is the main cause of the nonlinear response, and the ultrafast nature of the process is demonstrated.
Article
Multidisciplinary Sciences
Anna C. Tasolamprou, Evangelos Skoulas, George Perrakis, Matina Vlahou, Zacharias Viskadourakis, Eleftherios N. Economou, Maria Kafesaki, George Kenanakis, Emmanuel Stratakis
Summary: In this study, polarization-sensitive gap surface plasmon metasurfaces were fabricated on Ni film using laser-induced periodic surface structures, achieving polarization control through the size and infiltrating material of the insulating cavity.
SCIENTIFIC REPORTS
(2022)
Article
Materials Science, Multidisciplinary
A. Leventis, K. G. Makris, E. N. Economou
Summary: In the context of non-Hermitian Anderson localization, the physics of wave propagation in one-dimensional waveguide lattices with randomly distributed gain or loss is studied. The system exhibits counterintuitive propagation by quantized jumps between states located around distant sites, and a systematic understanding of the underlying physical mechanism is provided.
Article
Physics, Multidisciplinary
K. Baskourelos, O. Tsilipakos, T. Stefanski, S. F. Galata, E. N. Economou, M. Kafesaki, K. L. Tsakmakidis
Summary: This article reports on a new broadband, topological structure that enables near-perfect optical transmission through a single subdiffraction slit, offering high throughput and efficiency. It has significant implications for nanoscopes and heat-assisted magnetic recording devices.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Ioannis Katsantonis, Sotiris Droulias, Costas M. Soukoulis, Eleftherios N. Economou, T. Peter Rakitzis, Maria Kafesaki
Summary: This study investigates the potential of gain materials and combined gain-loss media for enhancing molecular chirality detection. The results demonstrate that the combination of a thin chiral layer with a gain-loss bilayer can significantly enhance circular dichroism (CD) response and dissymmetry factor g. The most pronounced enhancements are achieved with a parity-time (PT) symmetric gain-loss bilayer, and deviations from exact PT symmetry lead to moderate changes in CD and g response.
Proceedings Paper
Engineering, Electrical & Electronic
A. C. Tasolamprou, M. Kafesaki, C. M. Soukoulis, E. N. Economou, Th Koschny
Summary: A square-lattice photonic crystal is proposed to support chiral topological photonic surface states, which simplifies the design of coupling and demonstrates the topological nature of the surface states through band structure calculations and scattering analysis.
2021 FIFTEENTH INTERNATIONAL CONGRESS ON ARTIFICIAL MATERIALS FOR NOVEL WAVE PHENOMENA (METAMATERIALS)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
A. C. Tasolamprou, E. Takou, O. Tsilipakos, Z. Viskadourakis, M. Kafesaki, G. Kenanakis, E. N. Economou
Summary: This study presents a theoretical and experimental investigation of a thermally tunable all-dielectric metasurface sustaining a non-radiating anapole source. Using PVC tubes filled with water for the experimental realization, the metasurface shows wide tunability in response and sensitivity of the anapole state to material losses was revealed.
2021 FIFTEENTH INTERNATIONAL CONGRESS ON ARTIFICIAL MATERIALS FOR NOVEL WAVE PHENOMENA (METAMATERIALS)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
I Katsantonis, S. Droulias, C. M. Soukoulis, E. N. Economou, T. P. Rakitzis, M. Kafesaki
Summary: Active and parity-time symmetric metamaterials provide a new approach for molecular chirality sensing, enabling the detection of even small amounts of chiral substances and the differentiation of different enantiomers in circular dichroism experiments.
2021 FIFTEENTH INTERNATIONAL CONGRESS ON ARTIFICIAL MATERIALS FOR NOVEL WAVE PHENOMENA (METAMATERIALS)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
George Perrakis, Anna C. Tasolamprou, George Kenanakis, Eleftherios N. Economou, Stelios Tzortzakis, Maria Kafesaki
Summary: This study introduces a radiative cooling approach for evaluating the temperature and efficiency of photovoltaic cells, and demonstrates its effectiveness through experiments using a nano-micro-grating.
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
George Perrakis, Anna C. Tasolamprou, George Kenanakis, Eleftherios N. Economou, Stelios Tzortzakis, Maria Kafesaki
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Anna Theodosi, Odysseas Tsilipakos, Costas M. Soukoulis, Eleftherios N. Economou, Maria Kafesaki
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Charalampos P. Mavidis, Anna C. Tasolamprou, Shakeeb B. Hasan, Thomas Koschny, Eleftherios N. Economou, Maria Kafesaki, Costas M. Soukoulis, Willem L. Vos
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC)
(2021)
Article
Engineering, Multidisciplinary
Jason E. Nobles, K. Smiley, D. Bueno Baques, E. Economou, Jakub Herman, Ian Harward, Anatoliy Glushchenko, Robert E. Camley, Z. Celinski
Summary: Phased array radar systems utilizing liquid crystal materials for phase control are advancing in efficiency and applicability. Innovatively using dual frequency liquid crystals to improve beam steering response times in a compact, modular design, the system shows promising results for various applications.
ENGINEERING RESEARCH EXPRESS
(2021)
