Article
Materials Science, Multidisciplinary
F. Martinez, M. Maldovan
Summary: Metamaterials and devices with cloaking functionalities have the potential to bring fundamental advancements in various fields including invisibility, vibration mitigation, protection, shielding, and isolation. Recent developments in rational material design have allowed the control of electromagnetic waves, mechanical waves, heat, mass, and fluid flow through the design and fabrication of metamaterials and metasurfaces. This review discusses the discovery of new ways to achieve cloaking in light, sound, heat, mass flow, electrical and magnetic fields, and fluid flow, as well as their applications in different physical fields.
MATERIALS TODAY PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Stefano L. Oscurato, Francesco Reda, Marcella Salvatore, Fabio Borbone, Pasqualino Maddalena, Antonio Ambrosio
Summary: This study fully investigates the use of light-induced surface relief on azopolymers to realize large-scale multiplexed gratings with optimized diffraction performances, both theoretically and experimentally. The reconfigurable diffraction gratings designed and fabricated in a switchable two-beam interference setup can diffract polychromatic light in the same direction with controllable relative color intensities, with potential applications in emerging display areas.
ADVANCED MATERIALS INTERFACES
(2021)
Article
Physics, Applied
Darby Paez-Amaya, Ruben D. Muelas-Hurtado, Joao L. Ealo, Karen Volke-Sepulveda
Summary: This paper presents a method to generate two- and three-dimensional periodic or quasi-periodic acoustic lattices in air using polygonal active diffraction gratings. The radiated field depends on design parameters and is well predictable in terms of a superposition of oblique plane waves, with very good agreement with simulations and experiments. Our device represents a simple and efficient approach for producing acoustic lattices with attractive advantages, such as planar single-sided geometry, simple electronics, axial steering, and broadband operation. The design is scalable and compatible with other scientific applications, such as microfluidic platforms.
APPLIED PHYSICS LETTERS
(2023)
Article
Optics
Cleaven Chia, Bartholomeus Machielse, Amirhassan Shams-Ansari, Marko Loncar
Summary: Diamond has good optical properties and has been successfully used for quantum photonic devices operating at visible wavelengths. However, fabricating larger devices for telecommunication wavelengths has been challenging. This study evaluated different mask materials and found that a thick hydrogen silesquioxane layer on a thin alumina adhesion layer produced the best etch profile and optical performance.
Article
Optics
Angshuman Deka, Dilyana S. Mihaylova, Svetlen H. Tonchev, Semyon L. Zheleznyak
Summary: A new method for fabricating dual-blazed gratings is introduced, which involves aligning and bonding two gratings to obtain a monolithic replica with maintained optical control. This technique allows for tailoring grating efficiencies over a broad wavelength range. Furthermore, the effect of the seam orientation between two sections on scatter properties is investigated.
OPTICS AND LASER TECHNOLOGY
(2023)
Review
Multidisciplinary Sciences
Erqian Dong, Peizheng Cao, Jinhu Zhang, Sai Zhang, Nicholas X. Fang, Yu Zhang
Summary: Acoustic metamaterials, with their extraordinary capabilities such as negative refraction, cloaking, beam formation, and super-resolution imaging, have been widely studied. However, there are still challenges in freely manipulating acoustic propagation, especially in underwater environments.
NATIONAL SCIENCE REVIEW
(2023)
Article
Physics, Applied
Yue Bai, Xiaole Wang, Xudong Luo, Zhenyu Huang
Summary: This study proposes a contactless and non-closed strategy to reduce the sound radiated from an underwater source. By investigating the interaction between the source and different cross-sectional shapes, as well as an acoustic superscatterer treated as a concentric cylindrical structure, the complete landscape of remote radiation reduction is theoretically and numerically presented. The study demonstrates that by appropriately placing the acoustic superscatterer nearby the source, omnidirectional radiation reduction can be achieved. Possible schemes for the practical realization of the acoustic superscatterer are also discussed.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Meng Lian, Linqiu Duan, Junjie Chen, Jingyuan Jia, Ying Su, Tun Cao
Summary: This study demonstrates acoustic transmissive cloaking with adjustable capacity to the incident direction by constructing a hybrid acoustic structure consisting of a programmable phase-engineered metasurface (PPEM) and a double zero-refractive-index (DZRI) phononic crystal (PhC). The results show potential applications in underwater ultrasound, airborne sound, acoustic communication, imaging, etc.
MICROSYSTEMS & NANOENGINEERING
(2022)
Article
Engineering, Mechanical
Or Lasri, Lea Sirota
Summary: In this paper, we propose a solution to hide non-stationary objects from acoustic detection in a two-dimensional environment, considering the variation in impedance and detection signal properties. The solution involves creating a moving dead zone around the object using active control, resulting in an undetectable channel for the object to pass through. We validate the effectiveness of our control algorithm through numerical simulations, where the cloak successfully intercepts the detection source by adjusting control beams and their wavelength accordingly.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Optics
Peter Tillmann, Benedikt Blaesi, Sven Burger, Martin Hammerschmidt, Oliver Hoehn, Christiane Becker, Klaus Jaeger
Summary: This work presents optical simulations of III-V-on-silicon solar cells with a metal grating for improved light trapping efficiency. The study demonstrates that the period of the grating is a critical parameter affecting its performance, which can be highly controlled during manufacturing using inference lithography. The results suggest a pathway to exceed the current world record efficiency of the III-V-on-silicon solar cell technology.
Article
Acoustics
Zudi Yang, Xun Huang
Summary: This work explains the principles and methods of using topology optimization for the design of acoustic cloaks based on scattering cancellation. By considering fabrication restrictions and applying specific projection and filtering techniques, the gray transition regions and tiny structures in the optimized design are minimized. Experimental validation is conducted in different media, revealing performance differences and associated reasons.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2022)
Article
Materials Science, Multidisciplinary
Hong-Tao Zhou, Wen-Xiao Fu, Yan-Feng Wang, Yue-Sheng Wang, Vincent Laude, Chuanzeng Zhang
Summary: This study introduces a systematic approach to designing ultra-broadband passive metasurfaces by combining broad-band local reflection rules with optimization methods. Experimental results show that the relative bandwidth can exceed 93.33%, higher than previous passive metasurfaces, demonstrating excellent time-domain broadband characteristics.
MATERIALS & DESIGN
(2021)
Article
Acoustics
Davide Enrico Quadrelli, Gabriele Cazzulani, Simone La Riviera, Francesco Braghin
Summary: This paper introduces the use of elliptical coordinates and quasi-symmetric transformations to retrieve material properties for elliptical shaped targets. Additionally, it explores a quantifiable approximation introduced by the rotation tensor to generalize the usual approach for axisymmetric cloaks.
JOURNAL OF SOUND AND VIBRATION
(2021)
Review
Engineering, Electrical & Electronic
Ajith Ravindran, D. Nirmal, P. Prajoon, D. Gracia Nirmala Rani
Summary: This paper investigates the innovations of spectrometers for handheld MEMS spectrometers, emphasizing the importance of grating parameters and recent developments. Key factors such as grating efficiency, groove density, free spectral range, and resolving power significantly impact grating performance. The use of materials like silicon, silicon dioxide, glass, PMMA, chromium, and silicon nitride play a crucial role in the efficiency of the grating.
IEEE SENSORS JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Ruchi Gupta, Sameh El Sayed, Nicholas J. Goddard
Summary: This study presents a novel hydrogel grating system, utilizing the absorbance characteristics of a dye for spectroscopic analysis, with changes in diffracted light intensity used to detect analytes. Additionally, quantification of analytes is achieved by comparing diffracted light intensities at different wavelengths, reducing errors caused by variations in light intensity and photobleaching of dyes.
Article
Acoustics
Tianyu Gu, Zhihui Wen, Liangshu He, Minle Yu, Yong Li, Yan Li, Yabin Jin
Summary: We study a lightweight metastructure that can simultaneously reduce vibration and noise in a broad low-frequency range through theoretical, numerical, and experimental methods. By introducing spiral slits and micro-perforations in the panel and core plate, respectively, we achieve broadband low-frequency sound absorption and vibration isolation. This multifunctional metastructure provides a new route to design lightweight load-bearing structures with noise and vibration reduction performance for potential applications in aerospace engineering and transportation vehicles.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2023)
Article
Acoustics
Botao Liu, Sibo Huang, Bo Zheng, Xuefeng Chen, Jia Zhao, Xinrui Qi, Yong Li, Shengchun Liu
Summary: This study proposes an underwater sound-absorbing composite lattice with low-frequency and ultra-broadband characteristics. The lattice cells convert incident longitudinal waves into transverse waves through multiple local resonance coupling and multiple scattering. The proposed composite lattice provides a practical approach to designing ultrathin low-frequency and ultra-broadband acoustic absorption coating for underwater noise suppression.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2023)
Article
Acoustics
Xiao Pan, Longsheng Zeng, Yong Li, Xuefeng Zhu, Yabin Jin
Summary: This study numerically and experimentally analyzes FZP lenses around 5 MHz and achieves stable subwavelength underwater sound focusing. The relationship between focal spot size and the ratio of focal length to lens diameter, as well as the relationship between focal length and working frequency, is explored.
Article
Physics, Applied
Wenxin Zhong, Runcheng Cai, Xiaoying Zhuang, Timon Rabczuk, Yan Pennec, Bahram Djafari-Rouhani, Yabin Jin
Summary: The skin effect, which represents the localization of modes at the boundaries of a structure, is demonstrated for elastic waves propagating in a non-Hermitian phononic plate. The plate contains piezoelectric components that act as sensors and actuators. Complex non-reciprocal dispersion curves are calculated and analyzed for any wavevector direction in the two-dimensional space, revealing localization phenomena at different boundaries and corners of a finite square structure. Furthermore, the localized features can be reconfigured by adjusting the non-Hermiticity parameters, providing a feedback control strategy for potential applications in vibration control, energy harvesting, and sensing.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Applied
Xinsheng Fang, Nengyin Wang, Wenwei Wu, Weibo Wang, Xuewen Yin, Xu Wang, Yong Li
Summary: Metagratings, which are characterized by scattering matrices, show promise for efficient and anomalous wave-diffraction control. In this study, we focus on the degenerated states of scattering matrices induced by non-Hermiticity, which encode unique scattering behaviors. We investigate the exotic degeneracies, exceptional points (EPs), and diabolic points (DPs) in these scattering systems both theoretically and experimentally. We demonstrate the distinct response strength induced by EP and DP, with extremely asymmetrical reflection occurring on the EP state in a metagrating, offering opportunities for microvariable detection and external perturbation monitoring. In contrast, a stable dual-angle absorber is proposed on the DP state, which is almost unaffected by external perturbations. Our work may pave the way for extreme wave manipulation via non-Hermitian metagratings on degenerated states.
PHYSICAL REVIEW APPLIED
(2023)
Article
Physics, Applied
Bin Jia, Lujun Huang, Artem S. Pilipchuk, Sibo Huang, Chen Shen, Almas F. Sadreev, Yong Li, Andrey E. Miroshnichenko
Summary: In this study, we demonstrate the existence of symmetry-protected BICs in an open acoustic resonator with reduced symmetry by attaching two cylindrical waveguides. We experimentally verify the presence of these BICs and show that they can be converted into accidental BICs by tuning the angle between the waveguides.
PHYSICAL REVIEW APPLIED
(2023)
Article
Engineering, Mechanical
Hai D. Huynh, Xiaoying Zhuang, Harold S. Park, S. S. Nanthakumar, Yabin Jin, Timon Rabczuk
Summary: The Willis coupling, which couples momentum to strain in elastic metamaterials, has been extensively studied for its potential in enabling novel wave propagation phenomena. Recent work has shown that the momentum can also be coupled to electrical stimulus in piezoelectric composites, resulting in a new form of electro-momentum coupling. In this study, a topology optimization approach is presented to maximize the electro-momentum coupling in piezoelectric composites, allowing for the design of composites that support novel wave phenomena excited through non-mechanical means.
EXTREME MECHANICS LETTERS
(2023)
Article
Acoustics
Runcheng Cai, Yabin Jin, Yong Li, Jie Zhu, Hehua Zhu, Timon Rabczuk, Xiaoying Zhuang
Summary: In this study, we investigate the Parity-Time (PT) symmetric metaplate with balanced loss and gain, and achieve coherent perfect absorption and lasing effects for flexural waves. We also explore the exceptional points (EP) as thresholds of phase transitions and realize unidirectional reflectionless behavior for incident waves by adjusting circuit parameters. Our study provides insights into the origins and sensitivities of non-Hermitian exceptional points for elastic waves.
JOURNAL OF SOUND AND VIBRATION
(2023)
Review
Physics, Multidisciplinary
Xu Wang, Ruizhi Dong, Yong Li, Yun Jing
Summary: Acoustic metasurfaces, with their advanced capabilities of wave manipulation at a small size, are at the forefront of acoustic material research. However, conventional metasurfaces are limited by their underlying physics and design principles. Recent research has shown that harnessing non-locality and losses can enhance the functionality of acoustic metasurfaces, leading to a new design paradigm. This review summarizes the progress of non-local and non-Hermitian acoustic metasurfaces, discusses their critical role, and explores their potential and challenges.
REPORTS ON PROGRESS IN PHYSICS
(2023)
Article
Physics, Multidisciplinary
Haiyan Zhang, Shanshan Liu, Zhiwei Guo, Shengyu Hu, Yuguang Chen, Yunhui Li, Yong Li, Hong Chen
Summary: In this work, we propose theoretically and demonstrate experimentally unidirectional perfect absorption in a non-Hermitian acoustic system with the help of the topological bound state in the continuum (BIC). The system exhibits extreme asymmetry, with acoustic perfect absorption at the left incidence and near-total reflection at the right incidence. This study bridges the gap between scattering characteristics of non-Hermitian acoustic systems and topological scattering singularities, contributing to the research of novel non-Hermitian physics and practical applications of advanced absorbers and sensors.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2023)
Article
Optics
Tao He, Zhanyi Zhang, Jingyuan Zhu, Yuzhi Shi, Zhipeng Li, Heng Wei, Zeyong Wei, Yong Li, Zhanshan Wang, Cheng-Wei Qiu, Xinbin Cheng
Summary: This paper reports a universal paradigm for achieving high-efficiency exceptional points (EPs) in the visible range by leveraging interlayer loss to control the interplay between a lossy structure and scattering lightwaves. A bilayer framework is demonstrated to efficiently reflect and absorb incident light, opening up possibilities for nanoscale devices and EP physics.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Physics, Applied
Sibo Huang, Yong Li, Jie Zhu, Din Ping Tsai
Summary: This article provides an overview of recent progress in and future prospects for sound-absorbing materials (SAMs), including single resonant SAMs and coupled resonant systems, as well as the emergence of sound-absorbing metamaterials. The conservation equations and design strategies for achieving tunable and broadband SAMs are discussed, along with recent developments in multifunctional SAMs and metaliners. The article concludes with an outlook on potential directions and applications for future work in this field.
PHYSICAL REVIEW APPLIED
(2023)
Article
Physics, Applied
Shanshan Liu, Sibo Huang, Zhiling Zhou, Pei Qian, Bin Jia, Hua Ding, Nengyin Wang, Yong Li, Jie Chen
Summary: We report the theoretical and experimental observation of a Friedrich-Wintgen BIC with bridging near-field coupling in an asymmetric two-state acoustic system. By tuning the diameter and position of the bridging tube, we can effectively modulate the near-field coupling effect of the presented system and achieve a Friedrich-Wintgen BIC, as well as a quasi-BIC-based high Q-factor perfect absorption.
PHYSICAL REVIEW APPLIED
(2023)
Article
Physics, Multidisciplinary
Liangshu He, Yan Li, Bahram Djafari-Rouhani, Yabin Jin
Summary: Recently, the evolution of Weyl point in Weyl semimetals with nonhermiticity has attracted much research interest. In this study, we investigate the propagation of elastic flexural waves in a phononic beam containing piezoelectric materials and introduce nonhermiticity through active regulation of external circuits. By considering a synthetic parameter space, we demonstrate the emergence of a double Weyl point (DWP) at the band crossing. We further examine the evolution of the DWP from hermitic to nonhermitic situations and observe the formation of Weyl degenerate lines and Weyl hollow rings. Additionally, we analyze the changes in transmission spectra and discuss synthetic Fermi arc interface states. This paper provides insights into the Hermitian and non-Hermitian physics in elastic wave systems using synthetic dimensions.
PHYSICAL REVIEW RESEARCH
(2023)
