Article
Chemistry, Multidisciplinary
Xiaolong Lu, Jens Twiefel, Zhichao Ma, Tingting Yu, Joerg Wallaschek, Peer Fischer
Summary: The study presents a dynamic acoustic levitator based on mechanically controlling subwavelength apertures, allowing for easy and reliable manipulation of various targets. Experimental observations match well with numerical simulations, showing the levitator's ability to generate time-varying potentials and induce oscillatory and rotational motion in levitated objects.
Article
Physics, Applied
Xuewei Liu, Mingyu Duan, Maolin Liu, Fengxian Xin, Chuanzeng Zhang
Summary: The study introduces an acoustic labyrinthine porous metamaterial designed for subwavelength sound absorption by combining the acoustic properties of porous material matrix and folded slit configuration. The experimental results demonstrate excellent subwavelength low-frequency sound absorption performance of the material at low frequencies.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Acoustics
Wenjiong Chen, Chen Lu, Xiaopeng Wang, Shutian Liu
Summary: This paper proposes a subwavelength hierarchical honeycomb structure (SHHS) with a compact lateral dimension and double-band perfect absorption in low frequencies. The structure has an additional internal honeycomb with a perforated wall, resulting in two resonant cavities and multiple absorption peaks. Analytical, numerical, and experimental investigations are performed to study the proposed system's acoustic performance. The SHHS shows excellent potential for noise control engineering applications.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2023)
Article
Physics, Applied
Yi-jun Guan, Cheng-hao Wu, Qiao-rui Si, Yong Ge, Hong-xiang Sun, Yun Lai, Shou-qi Yuan
Summary: A low-frequency acoustic absorber has been experimentally demonstrated by using double split-ring resonators backed with a rigid wall. This absorber achieves near-perfect sound absorption at a subwavelength thickness and can increase the bandwidth by assembling supercells with distinct structure parameters.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Physics, Applied
B. J. Ash, A. R. Rezk, L. Y. Yeo, G. R. Nash
Summary: The research demonstrates how arrays of annular hole resonators can confine surface acoustic waves to regions much smaller than their wavelength, opening up new possibilities for applications in signal processing, sensing, and microfluidics.
APPLIED PHYSICS LETTERS
(2021)
Article
Acoustics
Guillaume Raybaud, Morvan Ouisse, Julien Leng, Adrien Pelat, Jean-Philippe Groby, Vicent Romero-Garcia, Ruben Pico, Francois Gautier
Summary: This study demonstrates analytically and experimentally the perfect absorption of bending waves in beams by thermally tunable subwavelength absorbers. By tuning the temperature and geometry of the blades in the resonating system, the critical coupling conditions can be simultaneously fulfilled, leading to the perfect absorption of the incident waves in the reflection problem.
JOURNAL OF SOUND AND VIBRATION
(2022)
Article
Acoustics
Shail A. Shah, Hans Boden, Susann Boij
Summary: Perforated plates are widely used in passive noise-control systems and this study continues to provide experimental results using different test setups. The passive acoustic response of a perforated plate is studied under excitation from three directions in the presence of grazing flow and high-amplitude acoustic excitation. The three-port technique used in this study allows for direct impedance determination without traditional boundary conditions.
JOURNAL OF SOUND AND VIBRATION
(2023)
Article
Optics
Hengfei Zhang, Jinpeng Yuan, Chaohua Wu, Lirong Wang, Liantuan Xiao, Suotang Jia
Summary: A scheme for subwavelength three-dimensional Rydberg atom localization using spatial optical absorption microscopy in a (V + Xi)-type atomic system has been proposed. Distinctive spatial localization patterns can be obtained by adjusting the laser fields, achieving a 100% probability of finding the Rydberg atom at a specific position in 3D subwavelength space under appropriate conditions. This scheme may offer a novel approach for high-precision 3D Rydberg atom localization in experiments.
LASER PHYSICS LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Qingxin Tian, Guohua Zhou, Minrui Leng, Guodong Xu, Xianyan Fan, Tiesheng Yan
Summary: This paper introduces a three-port converter (TPC) and its application in energy management and control methods for a PV/battery system, achieving lower costs, compact structure, and more flexible voltage relationships between ports.
INTERNATIONAL JOURNAL OF CIRCUIT THEORY AND APPLICATIONS
(2021)
Article
Energy & Fuels
Yang Chen, Jinggang Yang, Yang Xu, Chuanchuan Hou, Ke Zhao, Jianjun Ma, Miao Zhu
Summary: AC & DC hybrid power grid is an important trend in renewable energy systems, and the power electronic transformer plays a crucial role in the conversion and transmission of renewable energy. Existing topologies have drawbacks such as large volume and complex control. The TP-MMC, with a compact structure and multiple AC and DC ports, provides a solution for the interconnection of AC and DC power grids. The proposed voltage source control strategy in this paper enhances the inertial and self-synchronous ability of the AC port in TP=MMC, allowing flexible control of active and reactive power.
Article
Construction & Building Technology
Sichao Qu, Min Yang, Yunfei Xu, Songwen Xiao, Nicholas X. Fang
Summary: This article explores the value and potential applications of acoustic metamaterials in small room acoustics, particularly in addressing the challenge of achieving uniform acoustic environments in rooms with significant cavity resonances. The proposed design of incorporating multiple subwavelength acoustic resonators demonstrates its robustness in meeting specific acoustic requirements, making it suitable for various confined spaces.
BUILDING AND ENVIRONMENT
(2023)
Article
Automation & Control Systems
Huamin Jie, Zhenyu Zhao, Fei Fan, Yu Zeng, Firman Sasongko, Amit Kumar Gupta, Kye Yak See
Summary: This article presents two impedance measurement methods for three-phase CMCs and emphasizes the importance of these methods in terms of measurement accuracy and EMI filter design.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Materials Science, Multidisciplinary
Tao Yang, Boya Xiao, Yafei Feng, Dongliang Pei, Yu Liu, Meng Chen, Heng Jiang, Zhongyu Zheng, Yuren Wang
Summary: This paper proposes a subwavelength spiral element based on the Archimedean spiral, which forms a subwavelength Dirac cone in the band structure by utilizing its special geometric design, achieving the manipulation of acoustic topological insulator. The eigenfrequency of the element can be changed by adjusting its geometric parameters, triggering a topological phase transition and realizing a backscattering-immune unidirectional transmission edge state at different topological boundaries.
RESULTS IN PHYSICS
(2022)
Article
Green & Sustainable Science & Technology
Giuseppe Ciaburro, Rosaria Parente, Gino Iannace, Virginia Puyana-Romero
Summary: Waste management is a critical issue for industrialized countries, and sustainable architecture aims to reduce waste production by reusing materials. In this study, a new layered membrane metamaterial was developed using reused PVC membranes and metal washers, which showed good acoustic absorption properties. An artificial neural network model was trained to predict the sound absorption coefficient and identify the best metamaterial configuration.
Article
Acoustics
Guifeng Wang, Yuanting Wei, Zhenyu Chen, C. W. Lim
Summary: Due to their great application potential in programmable wave transportation, topological metamaterials have received significant research attention in recent decades. This article presents an acoustic metamaterial composed of a perforated nylon substrate and a ceiled air-flowing channel. The resonance frequency and topological phases of the metamaterial are tuned by filling the holes arranged in a honeycomb lattice with water. By adjusting the height of water columns, two subwavelength bandgaps are opened, leading to controllable bandgap and topological phase transitions. The study explores the dependence of topological protected interface mode frequency and quality factor on water height and proposes a design strategy to obtain high-quality topological protected interface mode at the desired frequency. Additionally, the article demonstrates topological rainbow trapping to terminate waves at different frequencies and locations. The controllable bandgap and topological protected interface mode enable the design of topological structures with simpler structures and lower cost.
Article
Acoustics
A. Merkel, G. Theocharis, F. Allein, J-P Groby, V Gusev, V Tournat
JOURNAL OF SOUND AND VIBRATION
(2019)
Article
Physics, Applied
Li-Yang Zheng, Vassos Achilleos, Olivier Richoux, Georgios Theocharis, Vincent Pagneux
PHYSICAL REVIEW APPLIED
(2019)
Article
Physics, Applied
Olivier Richoux, Vassos Achilleos, Georgios Theocharis, Ioannis Brouzos, Fotios Diakonos
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2020)
Article
Physics, Multidisciplinary
Li-Yang Zheng, Vassos Achilleos, Ze-Guo Chen, Olivier Richoux, Georgios Theocharis, Ying Wu, Jun Mei, Simon Felix, Vincent Tournat, Vincent Pagneux
NEW JOURNAL OF PHYSICS
(2020)
Article
Physics, Applied
F. Allein, V. Tournat, V. Gusev, G. Theocharis
PHYSICAL REVIEW APPLIED
(2020)
Article
Physics, Multidisciplinary
Li-Yang Zheng, Georgios Theocharis, Romain Fleury, Vincent Tournat, Vitalyi Gusev
NEW JOURNAL OF PHYSICS
(2020)
Article
Physics, Applied
Antonin Coutant, Vassos Achilleos, Olivier Richoux, Georgios Theocharis, Vincent Pagneux
Summary: This study investigates the acoustic analog of the two-dimensional Su-Schrieffer-Heeger model, revealing the behavior of topological edge waves and their scattering on edge structure changes. It is shown that edge waves exhibit perfect reflection at specific changes such as corners, leading to a new way of constructing corner modes. The high reflectivity applies to a broad class of edge changes, such as steps or defects, and results in localized edge modes isolated from their surroundings in finite networks.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Acoustics
Antonin Coutant, Vassos Achilleos, Olivier Richoux, Georgios Theocharis, Vincent Pagneux
Summary: This research proposes a unique construction to precisely map acoustic modes to specific topological modes, controlling the relationship between acoustic frequency and resonator characteristics to obtain SSH topological modes. This method can achieve well-controlled topological edge modes in the subwavelength regime or other tunable configurations.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2022)
Article
Multidisciplinary Sciences
Florian Allein, Adamantios Anastasiadis, Rajesh Chaunsali, Ian Frankel, Nicholas Boechler, Fotios K. Diakonos, Georgios Theocharis
Summary: This study introduces a family of topological systems called strain topological metamaterials, whose topological properties are only revealed under higher-order coordinate transformations. The findings show that the canonical mass dimer and the Mechanical Majorana-supporting Kitaev chain belong to this family and can support topological edge states with complex boundaries.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Adamantios Anastasiadis, Georgios Styliaris, Rajesh Chaunsali, Georgios Theocharis, Fotios K. Diakonos
Summary: A remarkable feature of the SSH3 model is the existence of localized edge states, but the change in the total number of edge states does not necessarily imply a phase transition. The topological invariant predicted by the 10-fold way classification may not coincide with the actual number of edge states. In this study, a simple alternative approach using sublattice Zak's phase is proposed, which remains valid in the absence of mirror symmetry and noncommensurate chains. The defined bulk quantity is gauge invariant and can be interpreted as the difference in the number of edge states between a reference and a target Hamiltonian. The derivation also predicts exact corrections for finite open chains and invokes a chiral-like symmetry.
Article
Materials Science, Multidisciplinary
I Brouzos, I Kiorpelidis, F. K. Diakonos, G. Theocharis
Article
Optics
P. G. Kevrekidis, Wenlong Wang, G. Theocharis, D. J. Frantzeskakis, R. Carretero-Gonzalez, B. P. Anderson
Article
Materials Science, Multidisciplinary
Rajesh Chaunsali, Georgios Theocharis
Article
Materials Science, Multidisciplinary
Li-Yang Zheng, Florian Allein, Vincent Tournat, Vitalyi Gusev, Georgios Theocharis
Article
Optics
I Kiorpelidis, F. K. Diakonos, G. Theocharis, V Pagneux, O. Richoux, P. Schmelcher, P. A. Kalozoumis