Article
Multidisciplinary Sciences
Ali A. A. Husain, Edwin W. W. Huang, Matteo Mitrano, Melinda S. S. Rak, Samantha I. I. Rubeck, Xuefei Guo, Hongbin Yang, Chanchal Sow, Yoshiteru Maeno, Bruno Uchoa, Tai C. C. Chiang, Philip E. E. Batson, Philip W. W. Phillips, Peter Abbamonte
Summary: This article reports the discovery of a special plasmon called a "demon" from Sr2RuO4, which is composed of electrons in the ss and bands, and exhibits electrically neutral characteristic and coupling to the particle-hole continuum. This study verifies a theoretical prediction made 67 years ago and suggests that demons may be a pervasive feature of multiband metals.
Article
Biophysics
Raul Izquierdo-Lopez, Rajveer Fandan, Alberto Bosca, Fernando Calle, Jorge Pedros
Summary: This paper theoretically demonstrates a plasmonic biosensor using a graphene-based van der Waals heterostructure on a piezoelectric substrate, which enhances the performance of mid-infrared spectroscopy by coupling far-field light to surface plasmon-phonon polaritons (SPPPs) through a surface acoustic wave (SAW). The proposed device has the capability of fingerprinting ultrathin biolayers with a sensitivity down to the monolayer limit.
BIOSENSORS & BIOELECTRONICS
(2023)
Article
Chemistry, Multidisciplinary
Martina Gilic, Mohamed Ghobara, Louisa Reissig
Summary: The light modulation capabilities of diatom silicious valves make them an excellent toolkit for photonic devices and applications. In this work, a reproducible surface-enhanced Raman scattering (SERS) enhancement was achieved with hybrid substrates containing diatom silica valves coated with an ultrathin uniform gold film. Comparative analysis of three structurally different hybrid substrates revealed that substrates with cylindrical Aulacoseira sp. valves achieved the highest SERS enhancement, up to 14-fold. Numerical analysis further supported the experimental results and showed that valve geometry and ultrastructure play a role in the magnitude of SERS enhancement.
Article
Chemistry, Multidisciplinary
Vladimir Poborchii, Jesse Groenen, Pavel Geshev, Junichi Hattori, Wen Hsin Chang, Hiroyuki Ishii, Toshifumi Irisawa, Tatsuro Maeda
Summary: This study investigates the thickness dependencies of phonons and electrons in GeOI nanolayers, demonstrating the use of acoustic phonon Raman spectra for probing GeOI thickness above 5 nm. Limitations of confinement theories for GeOI thickness below 5 nm are attributed to increased influence of Ge-GeO2 interface disorder. The study also suggests that Al2O3 coating improves agreement between experimental and confinement theories by reducing disorder at the Ge-GeOx-Al2O3 interface, with potential benefits for modern and future nanoelectronic devices.
Article
Chemistry, Multidisciplinary
Xin Li, Ming-Hao Liu, Zong-Lin Li, Xin-Ye Zou, Xue-Feng Zhu, Bin Liang, Jian-Chun Cheng
Summary: This article introduces the method of ultradeep-subwavelength holography by patterning holes in an acoustic insulation plate, which allows arbitrary manipulation of the transmitted sound field to form desired shapes. The nonlocal wave interaction theory is used to design ultrathin patterns that achieve a sophisticated hologram. Experimental results mapping the pressure amplitude field of a sun pattern in air and water demonstrate the advantages and applications of nonlocal ultrathin holography.
ADVANCED MATERIALS INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Hyeongpin Kim, Heedeuk Shin
Summary: This study demonstrates the acoustic-wave interference and active information manipulation by optically driven acoustic waves in a silicon photonic-phononic system. By adjusting the relative microwave phase, information with a narrow bandwidth of 6.2 MHz can be received with amplification or cancellation, providing a potential solution for on-chip information processing.
Article
Chemistry, Multidisciplinary
Damin Liu, Wencai Yi, Yanling Fu, Qinghong Kong, Guangcheng Xi
Summary: This study presents a mild and general in situ surface restraint-induced growth method for the preparation of highly crystalline tungsten nitride nanocrystals with excellent dispersibility, forming a hybrid structure in ultrathin carbon layers. These hybrid nanobelts exhibit strong localized surface plasmon resonance and surface-enhanced Raman scattering effects, with outstanding corrosion resistance, radiation resistance, and oxidation resistance, maintaining SERS performance in harsh environments. The synergistic Raman enhancement mechanism of LSPR and interface charge transfer is found in the carbon coated tungsten nitride substrate, enabling high-throughput dynamic SERS analysis in a microfluidic SERS channel.
Article
Acoustics
Meiling Hu, Li Shi, Haishan Zou, Mads Graesboll Christensen, Jing Lu
Summary: In this study, it is discovered that the nonuniqueness problem in multichannel transfer function modeling in time domain sound zone control can be solved using time-varying control filters. To achieve a stable acoustic contrast (AC) performance and avoid extreme distortion caused by maximizing AC in time domain, an adaptive control algorithm is developed based on maintaining a desired AC level. Simulation experiments validate the effectiveness of the proposed method in tracking environmental changes and adapting control filters to achieve stable AC performance.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2023)
Article
Chemistry, Multidisciplinary
Yang Li, Chengye Yu, Chuanbao Liu, Zhengjiao Xu, Yanjing Su, Lijie Qiao, Ji Zhou, Yang Bai
Summary: This study experimentally verifies the ion cloaking, concentrating, and selection functions in liquid solvents and proposes a plug and switch metamaterial concept based on scattering cancellation. By choosing different functional modules, control over different diffusion behaviors in the central region can be achieved. The plug and switch design is extensible and reconfigurable, facilitating the development of novel applications.
Article
Nanoscience & Nanotechnology
Aniu Qian, Hao Wu, Guangyu Wang, Nan Sun, Huaigang Cheng, Kan Zhang, Fangqin Cheng
Summary: An electrochemically etched strategy is proposed to synthesize -F-free Ti3C2Tx, which exhibits enhanced hydrophilicity and ion transport. The resulting CDI device shows high salt removal capacity and can generate electric current to power a red light-emitting diode.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Multidisciplinary Sciences
A. Roohezamin, R. Kalatehjari, M. Hajihassani, M. Kharghani, D. Dias
Summary: Understanding the acoustic behavior of buried tunnels in multilayer soil structures is crucial for locating and monitoring their structure health. This study presents a 3D finite element model of a tunnel system and investigates the variations in reflected and transmitted acoustic wave pressure for a multilayer soil buried tunnel. The effects of soil layers, tunnel buried depths, and lining concrete types on the acoustic wave behavior of the tunnel are evaluated. The findings can be applied to interpret recorded signals for structural health monitoring and locating underground structures, especially in media with multilayer soil structures.
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Multidisciplinary
Kai Pang, Xiaoting Liu, Jintao Pang, Akram Samy, Jin Xie, Yingjun Liu, Li Peng, Zhen Xu, Chao Gao
Summary: This study presents a highly efficient acoustic absorber by constructing cellular networks of ultrathin graphene membranes into polymer foams. The graphene drums exhibit strong resonances and efficiently dissipate sound waves. This scalable method allows for transforming commercial polymer foams into superior acoustic absorbers.
ADVANCED MATERIALS
(2022)
Article
Engineering, Mechanical
Tianbao Liang, Mu He, Hao-Wen Dong, Liang Xia, Xiaodong Huang
Summary: This research proposes a novel design strategy for ultrathin and highly efficient waterborne reflective pentamode metasurfaces to achieve uniform diffuse reflections in underwater scenes. A theoretical model is established to ease the demand on impedance matching and construct an ideal diffusion field. The spatially variant equivalent impedances of the metasurface are identified, and their corresponding pentamode material configurations are inversely designed with band structure analyses. Numerical results show high performance at the targeted frequency, and further verifications reveal applicability to a broader frequency range, paving the way for deep subwavelength scale acoustic wave manipulations with ultrathin waterborne metasurfaces.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Acoustics
Linjuan Cheng, Renhua Peng, Andong Li, Chengshi Zheng, Xiaodong Li
Summary: This paper proposes a new method using convolutional recurrent network to suppress stereophonic echo by estimating a nonlinear gain, which avoids the potential issues of reducing audio quality and stereophonic spatial perception in traditional methods.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2021)
Article
Geochemistry & Geophysics
Yan Yang, Zhongwen Zhan, Zhichao Shen, James Atterholt
Summary: Fault zone complexities contain important information about factors controlling earthquake dynamic rupture. In this study, the researchers utilized Distributed Acoustic Sensing (DAS) technique to extract data from an underground fiber-optic cable and locate and characterize faults using scattering waves. This method demonstrates the potential of passive imaging of fine-scale faults in an urban environment.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Chemistry, Multidisciplinary
Nikita Nefedkin, Ahmed Mekawy, Jonas Krakofsky, Yongrui Wang, Alexey Belyanin, Mikhail Belkin, Andrea Alu
Summary: Engineered intersubband transitions in multi-quantum well semiconductor heterostructures exhibit high second-order nonlinear susceptibilities in metasurfaces. By optimizing the design, the saturation limits in mid-infrared frequency upconversion in nonlinear metasurfaces are significantly extended. This has important implications for night-vision imaging and compact nonlinear wave mixing systems.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Julian Klein, Zhigang Song, Benjamin Pingault, Florian Dirnberger, Hang Chi, Jonathan B. Curtis, Rami Dana, Rezlind Bushati, Jiamin Quan, Lukas Dekanovsky, Zdenek Sofer, Andrea Alu, Vinod M. Menon, Jagadeesh S. Moodera, Marko Loncar, Prineha Narang, Frances M. Ross
Summary: Atomic-level defects in van der Waals (vdW) materials are essential for quantum technologies and sensing applications. The magnetic semiconductor CrSBr, with a direct gap and rich magnetic phase diagram, exhibits optically active defects that are correlated with the magnetic environment. The narrow defect emission in CrSBr is related to both the bulk magnetic order and an additional defect-induced magnetic order. This study establishes vdW magnets like CrSBr as an exceptional platform for studying defects and creating tailor-made magnetic textures with optical access.
Article
Physics, Applied
Kun Tang, Eitam Luz, David Amram, Luna Kadysz, Sebastien Guenneau, Patrick Sebbah
Summary: In this study, the practical realization of a unidirectional invisibility cloak for flexural waves using an area-preserving coordinate transformation is proposed. Time-resolved experiments and three-dimensional full-elasticity simulations demonstrate the effectiveness of the cloak in deviating pulsed plane waves and recombining the initial wavefront.
APPLIED PHYSICS LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Minye Yang, Zhilu Ye, Chia-Heng Sun, Liang Zhu, Mehdi Hajizadegan, Pai-Yen Chen
Summary: This article proposes and numerically studies a fully passive and lightweight intermodulation sensor based on the reconfigurable graphene field-effect transistors (GFETs) oscillator and passive frequency mixer. The output frequency of the self-powered GFET-based oscillator can be sensitive to the surface doping effect caused by charged surface absorbates, reactive gases, contaminations, or aqueous solutions. The intermodulation sensor effectively suppresses unwanted clutters, self-jamming, and interferences by mixing low-frequency signals with incident radio frequency (RF) waves.
IEEE SENSORS JOURNAL
(2023)
Article
Nanoscience & Nanotechnology
Guangwei Hu, Weiliang Ma, Debo Hu, Jing Wu, Chunqi Zheng, Kaipeng Liu, Xudong Zhang, Xiang Ni, Jianing Chen, Xinliang Zhang, Qing Dai, Joshua D. Caldwell, Alexander Paarmann, Andrea Alu, Peining Li, Cheng-Wei Qiu
Summary: Various optical crystals with opposite permittivity components have been observed and characterized in the mid-infrared regime. These crystals possess hyperbolic polaritons with large-momenta optical modes and wave confinement, making them promising for nanophotonic on-chip technologies. Monoclinic CdWO4 crystals are shown to exhibit symmetry-broken hyperbolic phonon polaritons and offer new opportunities for polaritonic phenomena.
NATURE NANOTECHNOLOGY
(2023)
Article
Nanoscience & Nanotechnology
Andrea Cordaro, Brian Edwards, Vahid Nikkhah, Andrea Alu, Nader Engheta, Albert Polman
Summary: As traditional microelectronic technology reaches its limits in speed and power consumption, there is a strong demand for novel computing strategies. Analogue optical computing has the advantage of processing large amounts of data at high speeds with negligible energy costs. Researchers have recently explored ultrathin optical metasurfaces for real-time image processing, particularly for edge detection. By incorporating feedback, they have also demonstrated that metamaterials can be used to solve complex mathematical problems, although this has been limited to guided-wave systems and large setups. This study presents an ultrathin Si metasurface-based platform for analogue computing, capable of solving Fredholm integral equations of the second kind using free-space visible radiation. The device combines an inverse-designed Si-based metagrating with a semitransparent mirror to perform the required Neumann series and solve the equation in the analogue domain at the speed of light. The use of visible wavelength operation enables a compact, ultrathin device that can be integrated on a chip and has high processing speeds.
NATURE NANOTECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Trung Dung Ha, Chia-Heng Sun, Mohamed Farhat, Pai-Yen Chen
Summary: Parity-time-reciprocal scaling (PTX) symmetry is used to tailor the resonance linewidth and gain threshold of non-Hermitian systems, with exciting applications such as coherent perfect absorber-lasers and exceptional point-based devices. A nearly-lossless, low-index metachannel formed by PTX-symmetric metasurfaces operating at the CPAL point is proposed, supporting undamped weakly-guided fast waves and achieving ultradirective leaky-wave radiation. This structure also allows for reconfigurable and tunable radiation angle and beamwidth. PTX-symmetric metasurfaces have potential in designing antennas and emitters with ultrahigh directionality and exploring emerging applications enabled by extreme material properties.
OPTICAL MATERIALS EXPRESS
(2023)
Editorial Material
Materials Science, Multidisciplinary
Andrea Alu
Summary: Optical Materials Express Editor-in-Chief, Andrea Ali, has introduced new topic categories for the Journal, redefining the Journal scope and better reflecting the current state of this dynamic field of research.
OPTICAL MATERIALS EXPRESS
(2023)
Article
Physics, Multidisciplinary
Waqas W. Ahmed, Mohamed Farhat, Kestutis Staliunas, Xiangliang Zhang, Ying Wu
Summary: Non-Hermitian systems provide new platforms for manipulating physical properties through redistribution of refractive indices, leading to asymmetric reflection and symmetric transmission. Supervised and unsupervised learning techniques are applied to accelerate the inverse design process and recognize non-Hermitian features from transmission spectra. The developed deep learning framework determines the feasibility of desired spectral responses and uncovers the role of gain-loss parameters in tailoring the spectra.
COMMUNICATIONS PHYSICS
(2023)
Article
Physics, Applied
Patrick C. Chaumet, Sebastien R. L. Guenneau
Summary: In this study, we investigate the electromagnetic forces and torques experienced on both perfect and discretized transformation-based concentrators under time-harmonic illumination. We compare the effect of the concentration to that of a perfect cloak. Furthermore, we examine the influence of a Lorentz dispersion model on the optical force and torque, and analyze the force experienced by a dielectric particle located at the center of the concentrator.
APPLIED PHYSICS LETTERS
(2023)
Review
Chemistry, Analytical
Minye Yang, Zhilu Ye, Yichong Ren, Mohamed Farhat, Pai-Yen Chen
Summary: Wearable electronics, as a new and rapidly expanding interdisciplinary field, have shown significant potential in monitoring and analyzing body or environmental information through flexible substrates, conductors, and transducers. Recent progress in the development of emerging nanomaterial-based wearable electronics and their current state-of-the-art applications are reviewed in this article, along with an outlook on future research directions in this field.
Article
Nanoscience & Nanotechnology
Elena Mikheeva, Remi Colom, Patrice Genevet, Frederic Bedu, Igor Ozerov, Samira Khadir, Guillaume Baffou, Redha Abdeddaim, Stefan Enoch, Julien Lumeau
Summary: With laser-annealing technology, we propose a novel approach to design and fabricate phase-gradient Huygens metasurfaces by using uniform particles made of As2S3 chalcogenide glass. Instead of tuning the geometry, we realize a phase gradient metasurface by tuning the refractive index of identical meta-atoms. By locally changing the refractive index of As2S3 particles using short-wavelength illumination, we can adjust the phase pattern of the metasurface after fabrication. The potential advantages of our method for low-cost mass production of large-scale metasurfaces lie in the use of uniform geometries.
Article
Physics, Applied
Mohamed Farhat, Pai-Yen Chen, Ying Wu
Summary: Waveguiding can occur when there is a transverse discontinuity or modulation in the refractive index, particularly in the case of acoustic waves. We propose a new approach that involves spinning a column of air, resulting in significantly modified acoustic refractive indices for specific azimuthal modes. This concept has the potential to be applied not only in creating an acoustic spinning fiber, which is the acoustic equivalent of an optical fiber, but also in producing a nonreciprocal unidirectional waveguiding mechanism similar to the acoustic Zeeman effect. While demonstrated in acoustics, this concept may have applications in other wave systems, such as elastodynamics.
PHYSICAL REVIEW APPLIED
(2023)
Review
Engineering, Electrical & Electronic
Zhilu Ye, Minye Yang, Yichong Ren, Cheng-Hsien Jonathan Hung, Chung-Tse Michael Wu, Pai-Yen Chen
Summary: Radio frequency identification (RFID) is a versatile platform for identifying, tracking, and monitoring objects. Passive harmonic RFID has emerged as an effective solution against electromagnetic interferences. This review article presents recent advances and applications of passive harmonic RFIDs and discusses their pros and cons.
IEEE JOURNAL OF RADIO FREQUENCY IDENTIFICATION
(2023)
Article
Automation & Control Systems
Waqas W. Ahmed, Mohamed Farhat, Pai-Yen Chen, Xiangliang Zhang, Ying Wu
Summary: This article proposes and demonstrates a generative deep learning approach for shape recognition of an arbitrary object using its acoustic scattering properties. The approach utilizes deep neural networks to learn the mapping between the latent space of a 2D acoustic object and the far-field scattering amplitudes. By training an adversarial autoencoder, the neural network determines the latent space of the acoustic object, embedding important structural features and accelerating the learning process for inverse design.
ADVANCED INTELLIGENT SYSTEMS
(2023)
