Article
Neurosciences
Zhongtao Hu, Yaoheng Yang, Lu Xu, Yao Hao, Hong Chen
Summary: Transcranial focused ultrasound (tFUS) is a promising technique for non-invasive and spatially targeted neuromodulation and treatment of brain diseases. Researchers designed and 3D printed binary acoustic metasurfaces (BAMs) to correct skull-induced phase aberration and achieve dynamic beam steering.
FRONTIERS IN NEUROSCIENCE
(2022)
Article
Physics, Applied
Na-Li Zhang, Sheng-Dong Zhao, Hao-Wen Dong, Yue-Sheng Wang, Chuanzeng Zhang
Summary: In this paper, a reflection-type broadband acoustic coding metasurface (BACMs) is proposed, which utilizes the coupling resonance mechanism between square helical channels and air cavities to achieve encoding and decoding functions in a wide frequency range. The application of the BACMs is demonstrated through numerical simulation and experiments, showing potential for use in the field of acoustic wave devices.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Applied
Jia Cao, Chunyao Lu, Qiujun Ma, Xiaopin Hu, Chenzhi You, Zheng Xu, Dawei Wu
Summary: This study presents a coding acoustic metasurface consisting of two types of hexagonal coding bits, enabling acoustic focusing, flexible focal length adjustment, and bifocal focusing. The findings have promising applications in biomedical therapy and imaging.
APPLIED PHYSICS EXPRESS
(2022)
Article
Chemistry, Analytical
Zheng Zhang, Liqun Wu, Yaxing Wang, Ze'en Wang, Guanwu Wu, Yajing Wang, Hongcheng Wang
Summary: In this paper, the mechanism of cavity manufacturing inside metals under compound acoustic fields for direct manufacturing without assembly is investigated. A local acoustic cavitations model is established to study the single bubble generation at a fixed point in Ga-In metal droplets. Cavitation-levitation acoustic composite fields are integrated with the experimental system for simulation and experimentation. The duration of the cavitation bubble is controlled by controlling the driving acoustic pressure's frequency and the magnitude of ambient acoustic pressure, enabling the direct fabrication of cavity inside Ga-In alloy.
Article
Physics, Applied
Shuai Tang, Bin Ren, Yuxin Feng, Jie Song, Yongyuan Jiang
Summary: The study demonstrates that broadband acoustic focusing can be achieved using a sub-wavelength binary metasurface. Experimental validation confirms significant acoustic focusing within the bandwidth of 0.8f(0)-1.6f(0), offering potential for active manipulation of focal length.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Mingxin Xu, William S. Harley, Zhichao Ma, Peter V. S. Lee, David J. Collins
Summary: Acoustic metasurfaces with complex 3D structures complicate their fabrication and applicability to higher frequencies, but an ultrathin metasurface approach utilizing planarized micropillars in a discretized phase array is demonstrated here. This subwavelength metasurface can be easily produced via a single-step etching process and is suitable for megahertz-scale applications. The flexibility of this approach is further demonstrated in the production of complex acoustic patterns via acoustic holography. This metasurface approach, combined with predictive models, has broad potential for robust, high-frequency acoustic manipulation in various applications.
ADVANCED MATERIALS
(2023)
Article
Optics
Mansoor A. Sultan, Fatih Balli, Daniel L. Lau, J. Todd Hastings
Summary: This work presents the design and fabrication of polymeric, structural optical filters that simultaneously focus light, representing a novel design at the boundary between diffractive optics and metasurfaces. Filters for visible and near-infrared wavelengths were designed using finite-difference time-domain (FDTD) simulations. Prototype filters fabricated using two-photon lithography show excellent agreement between experimental measurements and simulations.
Article
Multidisciplinary Sciences
Xudong Zhang, Yilin Liu, Jiecai Han, Yuri Kivshar, Qinghai Song
Summary: Ultracompact sources of circularly polarized light are important for both classical and quantum optical information processing. The efficient and controllable emission of circularly polarized light from resonant metasurfaces using the physics of chiral quasi-bound states in the continuum has been demonstrated, promising multiple applications in nanophotonics and quantum optics.
Article
Instruments & Instrumentation
Guangxin Liao, Zhenwei Wang, Congcong Luan, Jiapeng Liu, Xinhua Yao, Jianzhong Fu
Summary: This study demonstrates the fabrication of broadband acoustic focusing lens and asymmetric acoustic focusing lens using additive manufacturing technology, achieving focusing of acoustic waves in a wider frequency range. Experimental results show excellent performance of the designed focusing lens and asymmetric focusing lens, with good consistency between measured and simulated results.
SMART MATERIALS AND STRUCTURES
(2021)
Article
Multidisciplinary Sciences
Pei-Nan Ni, Pan Fu, Pei-Pei Chen, Chen Xu, Yi-Yang Xie, Patrice Genevet
Summary: In this study, the authors demonstrate an ultra-compact approach to access and manipulate the optical spin states of VCSELs using the on-chip integration of Jones matrix metasurfaces. They show previously unattainable phase controllability and experimentally validate the performance of CMOS compatible Jones matrix metasurfaces integrated with standard VCSELs. This approach is of great significance for the development of spin-optoelectronic devices.
NATURE COMMUNICATIONS
(2022)
Article
Crystallography
Jin-Chen Hsu, Herwandi Alwi, Chun-Hao Wei, Kai-Li Liao, Che-Ting Huang
Summary: This study investigates the behavior of high-frequency underwater ultrasounds reflected by gradient acoustic metasurfaces through numerical and experimental methods. The metasurfaces were fabricated with a periodic array of gradient slits on a steel specimen surface. The results show that the metasurfaces exhibit anomalous reflection, specular reflection, apparent negative reflection, and radiation of surface-bounded modes for ultrasonic waves at different incident angles. The study also demonstrates strong anomalous reflection and retroreflection at specific incident angles. The importance of this study is rated 8 out of 10.
Article
Engineering, Electrical & Electronic
Ashif A. Fathnan, Toufiq M. Hossain, Dadin Mahmudin, Yusuf Nur Wijayanto, David A. Powell
Summary: This study reports the characterization of an achromatic focusing metasurface at oblique incident angles. It is found that in addition to off-axis aberrations caused by the hyperbolic phase profile, the focusing performance is significantly degraded due to angular dispersion of the meta-atoms. Point dipole models are used to investigate the relationship between the angular and spectral bandwidth of meta-atoms and the metasurface focusing performance. It is confirmed that the angular dispersion is the dominant mechanism in determining off-axis aberrations.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Physics, Applied
Mohammad Hosein Fakheri, Hamid Rajabalipanah, Ali Abdolali
Summary: The study introduces a space-time-coding acoustic digital metasurface that can dynamically transfer the energy of the carrier acoustic signal to a series of harmonic components with precisely engineered magnitudes and phases. By distributing coding sequences in both space and time dimensions, diverse scattering functionalities for one or multiple harmonic frequencies can be elaborately acquired in a programmable way. This paradigm opens up unprecedented potential for efficient harmonic control in adaptive beamforming and acoustic imaging systems without the use of high-cost nonlinear components.
PHYSICAL REVIEW APPLIED
(2021)
Review
Mechanics
A-Li Chen, Yue-Sheng Wang, Yan-Feng Wang, Hong-Tao Zhou, Si-Min Yuan
Summary: This review summarizes recent developments in acoustic/elastic metasurfaces and outlines future research directions in this field.
APPLIED MECHANICS REVIEWS
(2022)
Article
Computer Science, Information Systems
Chao Cai, Henglin Pu, Liyuan Ye, Hongbo Jiang, Jun Luo
Summary: This paper proposes a method for measuring ambient temperature using a smartphone as an interference-resistant sensor. The method utilizes dual microphones on the smartphone to estimate air-borne sound propagation speed, thereby deriving ambient temperature. By using a specific algorithm to handle interference noise, the sensor achieves a median error of 0.6°C even under severe interference.
IEEE TRANSACTIONS ON MOBILE COMPUTING
(2023)
