Article
Engineering, Biomedical
Saba Rahimi, Ryan M. Jones, Kullervo Hynynen
Summary: This study investigates the feasibility of non-invasive trans-rodent skull ultrasonic focusing at high frequency and suggests that an acoustic measurement library can facilitate non-invasive transcranial aberration correction, providing a practical approach for delivering high-frequency ultrasound brain treatments in small animals.
IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING
(2022)
Article
Engineering, Electrical & Electronic
Haiyang Zhang, Nir Shlezinger, Francesco Guidi, Davide Dardari, Yonina C. Eldar
Summary: Future 6G wireless communications will require large-scale antenna arrays to support higher data rates, improved energy efficiency, and more diverse users. This may involve operations in both the radiating near-field and far-field regions. This article discusses the opportunities and challenges of radiating near-field communications, including the need for new wireless channel models and the advantages of leveraging spherical wavefronts for beam focusing in 6G systems. It also highlights potential applications such as interference mitigation, accurate localization, focused sensing, and wireless power transfer.
IEEE COMMUNICATIONS MAGAZINE
(2023)
Article
Acoustics
Athanasios G. G. Athanassiadis, Lennart Schlieder, Kai Melde, Valentin Volchkov, Bernhard Scholkopf, Peer Fischer
Summary: Acoustic holograms have been used for various applications, but their temporal control has been limited. This study introduces a technique that utilizes an input transducer array and a multiplane hologram to project time-dynamic pressure fields. Through numerical simulations and experiments, it is shown that the multiplane hologram outperforms a single-plane hologram, and adding more planes can improve the output quality.
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
(2023)
Article
Engineering, Electrical & Electronic
Marjan Bakhtiari-Nejad
Summary: This paper proposes a method using acoustic holograms and a single ultrasonic transducer to achieve multi-focal focusing and acoustic patterning for selective charging of sensors/receivers. Numerically designed holograms are used to generate multi-focal pressure patterns in a target plane, resulting in significant excitation of receivers located at the focal points. Experimental results show a significant enhancement in power output for the targeted receivers.
SENSORS AND ACTUATORS A-PHYSICAL
(2022)
Article
Computer Science, Software Engineering
Viktorija Paneva, Arthur Fleig, Diego MartiNez Plasencia, Timm Faulwasser, Jorg Muller
Summary: Acoustic levitation has the ability to create volumetric content by trapping and moving particles. However, the problem of determining physically feasible trap trajectories to display desired shapes is unsolved. We propose OptiTrap, a numerical approach that generates physically feasible and nearly time-optimal trap trajectories to display generic mid-air shapes.
ACM TRANSACTIONS ON GRAPHICS
(2022)
Article
Acoustics
Braeden C. Benedict, Mohammad Meraj Ghanbari, Rikky Muller
Summary: This article presents the design of a custom planar phased array ultrasound (US) system capable of steering and focusing US power within a 3-D volume. The use of time reversal as a computationally simple beamforming technique is proposed and compared with other techniques in terms of energy transfer efficiency. The system is also demonstrated to enable simultaneous power delivery to multiple implants.
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
(2022)
Review
Nanoscience & Nanotechnology
Sam Lin, Yixin Chen, Zi Jing Wong
Summary: The ability to control and steer optical beams is crucial for various emerging technologies. Chip-scale photonic platforms offer faster, smaller, lighter, and more energy-efficient mechanisms to manipulate light. Recent advancements in nanophotonics have enabled high-performance optical beam steering, opening up new possibilities in optical applications, communication, and displays.
Article
Chemistry, Multidisciplinary
Qiang Gao, Zhou Yang, Ruitong Zhu, Jinping Wang, Pengzhao Xu, Jiayu Liu, Xiaowen Chen, Zuyao Yan, Yixin Peng, Yanping Wang, Hairong Zheng, Feiyan Cai, Wei Wang
Summary: The researchers have discovered that ultrasound of around 100 kHz can spin spherical micromotors in specific directions and at varying speeds, as well as making them move in circular trajectories. This spinning is believed to be caused by circular microstreaming flows that occur when a solid microsphere vibrates in ultrasound. These flows can also assist in releasing cargos from micromotors. This finding shows that ultrasound can be used to steer microrobots in complex environments and manipulate microorganisms and cells.
Article
Engineering, Electrical & Electronic
Ali Hajimiri, Behrooz Abiri, Florian Bohn, Matan Gal-Katziri, Mohith H. Manohara
Summary: This paper presents architectures, circuits, and algorithms for dynamic 3-D lensing and focusing of electromagnetic power in radiative near- and far-field regions by arrays that can be arbitrary and nonuniform. It demonstrates the feasibility and effectiveness of RF lensing techniques which can recover more than 2 W of dc power wirelessly at distances greater than 1 m. The system can project power dynamically at various angles and distances greater than 10 m, showing potential for unified wireless power, sensing, and communication solutions in the future.
IEEE JOURNAL OF SOLID-STATE CIRCUITS
(2021)
Article
Engineering, Electrical & Electronic
Rafael Gonzalez Ayestaran, Marcos Rodriguez Pino, Paolo Nepa, Borja Imaz-Lueje
Summary: The feasibility of a novel near-field focusing technique based on time-modulated arrays is studied. It shows the potential for multiuser focusing at different frequencies, advantageously exploiting the characteristic side frequencies radiation of TMAs. TMAs are interesting alternatives to other technologies due to their simpler implementation through digital devices and adaptive implementation as required.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Engineering, Electrical & Electronic
Hsi-Tseng Chou
Summary: This practical methodology aims to maximize wireless power transfer efficiency using analog beamforming networks and digital phase shifters for antenna arrays, determining required excitation weightings through reaction matrix calculation and singular value decomposition method. The technique utilizes electronically beam steering functionality to achieve maximum WPT efficiency, with full-wave simulation results showing feasibility of the concept.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Yue Wang, Dajian Cui, Yu Wang, Guohui Yang, Bin Zhang, Yu Zhang, Chunhui Wang
Summary: In this paper, an all-solid-state, electrically tunable, and reflective terahertz phased array based on a novel graphene metasurface is proposed. The designed array can achieve specific deflection angles or continuous scanning in an ultra-wide range, while maintaining the beam steering function.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Optics
Caiming Sun, Lesi Yang, Binghui Li, Wu Shi, Hongjie Wang, Zhenmin Chen, Xiaomin Nie, Shupeng Deng, Ning Ding, Aidong Zhang
Summary: This study reports for the first time a two-dimensional beam steering on silicon nitride nanophotonic phased arrays from visible to near-infrared wavelengths, by utilizing one-dimensional waveguide surface grating arrays and adjusting wavelengths and phase shifts for steering along both transverse and longitudinal directions.
Article
Chemistry, Analytical
Dmitry A. Sednev, Alexey I. Soldatov, Andrey A. Soldatov, Maria A. Kostina, Dmitry O. Dolmatov, Daria A. Koneva
Summary: This study investigates the angular resolution of concave and convex acoustic arrays in ultrasonic testing using the total focusing method. Computer modeling and in situ experiments were conducted to validate the results.
Article
Engineering, Mechanical
Xinyu Zhao, Zemin Ma, Jiaying Zhang
Summary: The advantages and limitations of the full matrix focusing method of ultrasonic phased array in Ultrasonic NDT are discussed in this paper. Two simplified matrix focusing methods, the triangular matrix focusing algorithm and the trapezoidal matrix focusing algorithm, are proposed to address the problem of time-consuming data acquisition and processing. Experimental results show that both algorithms significantly improve the imaging quality and efficiency compared to the original full matrix focusing method.
CHINESE JOURNAL OF MECHANICAL ENGINEERING
(2022)