Coding acoustic metasurfaces

Author: nwgq

August undefined, 2024

Web摘要： Acoustic metasurfaces display unprecedented potential for their unique and flexible capabilities of wave front manipulations. Although rapid progress and significant developments have been achieved in this field, it still remains a significant challenge to obtain an acoustic metasurface that can perform different functions in three-dimensional … WebDec 18, 2024 · To overcome these shortcomings, here we propose frequency-selected bifunctional coding acoustic metasurfaces. Dual-layer Helmholtz-like resonators are …

Frontiers Programmable metasurface RCS prediction under …

Web2 days ago · Download Citation Bubble-type coding metasurfaces for broadband deep subwavelength underwater acoustic manipulations We construct a reflective … WebNov 25, 2024 · An acoustic Talbot coding metasurface. An array of 2 × 2 elements forms a basic unit cell of the coding metasurface. Each element can provide one of the 0, π/2, π, and 3π/2 phase-delay responses as one state in a 2-bit 4-digital states “00”, “01”, “10”, and “11.” With carefully designing each unit cell from four phase-mask ... defence ir refresh

Reflection-type broadband coding metasurfaces for acoustic …

WebJan 11, 2024 · Here, the authors report an approach for creating various acoustic wavefronts in free space by using soft gradient-index porous metasurfaces. These flat lenses generate steered planar, focused ... WebHere, we design an acoustic coding metasurface (ACM) lens to achieve a broadband tunable focusing in air. This simple ACM lens only includes two coding bits: a space-folding structure is designed to act as the bit '1' and an air unit … WebApr 2, 2024 · Investigations on coding metasurfaces have been extended to acoustics [5], [19], [47], [48]. For instance, Xie et al. have proposed the concept of coding acoustic metasurface [19] and achieved the multifunctional modulation by shifting the transmitted phases on the surface in real time [49]. However, some existing coding AMs have … defence intelligence agency abuja address

Pentamode-Based Coding Metasurface for Underwater Acoustic …

WebOct 17, 2024 · By using a phase difference of precisely π, coding acoustic metasurfaces are experimentally demonstrated. Google Scholar Bok, E. et al. Metasurface for water-to … WebApr 1, 2024 · As an analogue of the binary acoustic metasurfaces (BAMs), the sparse binary elastic metasurfaces (SBEMs) which consist of two different coding units with sparse arrangement is designed. A systematic design method based on topology optimization (TO) is developed to search the coding units. feeder for baby chicksWebAug 11, 2024 · Transcranial focused ultrasound (tFUS) is a promising technique for non-invasive and spatially targeted neuromodulation and treatment of brain diseases. Acoustic lenses were designed to correct the skull-induced beam aberration, but these designs could only generate static focused ultrasound beams inside the brain. Here, we designed and … defence it helpdesk

"WebAug 31, 2024 · By entering the world of time, here, we propose a space-time-coding acoustic digital metasurface with exotic ability to dynamically transfer the energy of the … " - Coding acoustic metasurfaces

Coding acoustic metasurfaces

A reflective acoustic meta-diffuser based on the coding meta …

WebDec 1, 2016 · A tensor coding metasurface at terahertz (THz) frequency that could take full-state controls of an electromagnetic wave in terms of its polarization state, phase and amplitude distributions, and wave-vector mode is proposed. 51 A Review of THz Modulators with Dynamic Tunable Metasurfaces Lan Wang, Yaxin Zhang, +9 authors Ziqiang Yang … WebMetasurfaces, as a class of emergent platforms, have shown enormous potentials in controlling classical waves. However, achieving simultaneous and dyn…

Did you know?

WebMay 13, 2024 · We present an acoustic metamaterial (AMM) consisting of a dumbbell-shaped split hollow sphere (DSSHS). Transmission results of experiments and simulations both presented a transmitted dip at the resonant frequency of AMM, which demonstrated its negative modulus property. As the two split holes in the DSSHS had strong coupling … Web1 day ago · Bubble-type coding metasurfaces for broadband deep subwavelength underwater acoustic manipulations. Ping Han 1, Zhan-Dong Huang 2, Hao-Wen Dong 3 …

WebApr 4, 2024 · In this paper, we propose a kind of reflection-type broadband acoustic coding metasurfaces (BACMs), which are composed of two square helical channels and the connected air cavity at the end of the channels. This helical-cavity coupled structure is selected as a logical unit “1,” the pure air hole is set as a logical unit “0,” and the ... WebJun 29, 2024 · The manipulation of acoustic waves plays an important role in a wide range of applications. Currently, acoustic wave manipulation typically relies on either acoustic …

WebDec 6, 2016 · Abstract. Coding acoustic metasurfaces can combine simple logical bits to acquire sophisticated functions in wave control. The acoustic logical bits can achieve … WebOct 15, 2024 · Ya Zhang, Boyang Xie, Wenwei Liu, Hua Cheng, Shuqi Chen*, and Jianguo Tian, “Anomalous reflection and vortex beam generation by multi-bit coding acoustic metasurfaces,” Appl. Phys. Lett. 114, 091905 (2024).

Web2 days ago · Download Citation Bubble-type coding metasurfaces for broadband deep subwavelength underwater acoustic manipulations We construct a reflective broadband acoustic coding metasurface using ...

WebProgrammable metasurfaces have attracted significant attention in various applications such as radar and 6G communications, owing to their ability freely shape the far-field pattern. However, complex calculations and simulations are always required when designing specific far-field patterns, especially when irregular obstacles are outside the … defence intelligence yardstickWebIn this paper, we present a novel acoustic coding metasurface structure for underwater sound scattering reduction based on pentamode metamaterials. The metasurface is composed of two types of hexagonal pentamode unit cells with phase responses of 0 and π respectively. The units are arranged in random 1-bit coding sequence to achieve low ... defence ismWebApr 6, 2024 · Thirdly, the repaid development of coding and programmable metamaterials and metasurfaces has provided a flexible method to achieve the frequency-tunable wavefront modulation in electromagnetics, which has been witnessed in the past few years [25, 26]. Inspired by these concepts, analogous coding acoustic metasurfaces have … defence jobs army officerWebDec 18, 2024 · Recently, coding metasurfaces have been demonstrated to realize fascinating functions in acoustics, including far-field modulation, focusing, and vortex … feeder for cutlery machineWebJan 1, 2024 · By introducing the addition principle into the design theory and encoding different metasurfaces, the corresponding scattered beams can be superimposed to achieve the arbitrary modulation of the... defence jobs cyber securityWebAug 19, 2024 · In this work, we present a type of binary metasurface (BM) to generate an acoustic Airy beam in air. Two coding bits, a rectangular cavity (bit “0”) and a waveguide with seven Helmholtz resonators (bit “1”), are adopted to construct the acoustic structure, which offers degrees of freedom to manipulate the transmitted field. defence investment gaps analysisWebMar 8, 2024 · Here, we propose the multi-bit coding acoustic metasurfaces to manipulate the reflection of acoustic waves. Theoretical predictions and experimental results are given to demonstrate the functions of wave … defence jobs gap year