![]() High-efficiency anomalous acoustic splitters based on genetic optimization algorithm and acoustic metagratings are designed to split the incident wave into different directions ( Ni et al., 2019). In order to solve the above-mentioned problems existing in beam splitters based on acoustic metasurfaces, simple and high-efficiency acoustic metagratings ( Torrent, 2018 Fan and Mei, 2021) based on diffraction theory provide a reliable method for achieving good acoustic performances. Furthermore, the most commonly used microstructures including resonator structures ( Shen et al., 2018) and space coiling-up structures ( Jia et al., 2018) have complex configuration, which may result in large intrinsic loss and low efficiency. However, we can find that the beam splitters based on acoustic metasurfaces are inevitably limited in element resolution, manipulation efficiency, and operating angle. Coding acoustic metasurfaces composed of hornlike helical unit were theoretically and experimentally demonstrated for realizing acoustic splitting ( Fang et al., 2019). Reflection-type coding acoustic metasurfaces were designed for realizing broadband acoustic splitter by encoding the sequence of logical units ( Zhang et al., 2022). In addition, coding acoustic metasurfaces are widely used for designing acoustic beam splitters. Bianisotropic metasurface was developed for near-perfect arbitrary beam splitting by introducing self-induced surface waves into scattered field ( Li et al., 2020). Beam splitting with arbitrary energy ratios can be realized by non-local grooved metasurfaces by using deep learning algorithms ( Ding et al., 2021). 2019) proposed a power flow-conformal acoustic beam splitter by manipulating the surface impedance distribution of metasurface to split the incident wave into two reflected beams propagating along two different directions. Acoustic metasurfaces capable of manipulating the amplitude and phase of acoustic waves provide a good method for realizing beam splitting. Particularly, acoustic beam splitters have attracted growing interest recently due to their applications in acoustic communication ( Prada et al., 2007) and acoustic sensing ( Dowling and Sabra, 2015) fields.Īcoustic beam splitters ( Ni et al., 2019) are devices that can effectively split the incident beam into two or more beams. In recent years, acoustic metasurfaces have attracted significant attention for their great potential applications in many fields attributed by their interesting and extraordinary acoustic properties ( Zhao et al., 2022), such as anomalous reflection and refraction ( Memoli et al., 2017 Zhu and Lau, 2019), acoustic focusing ( Qi et al., 2017 Lombard et al., 2022), acoustic cloaking ( Faure et al., 2016 Jin et al., 2019), sound absorption ( Aurégan, 2018 Song et al., 2019), one-way acoustic propagation ( Liang et al., 2010 Li et al., 2017 Song et al., 2019), beam splitting ( Ding et al., 2021), etc. Our research work provides a simple method for designing acoustic beam splitters and has extensive applications in acoustic sensing and communication.Īcoustic metasurfaces ( Cummer et al., 2016 Assouar et al., 2018) are artificially designed structures composed of periodic subwavelength elements including groove structures ( Shen et al., 2018), Helmholtz resonators ( Li et al., 2018), labyrinthine structures ( Xie et al., 2014), space coiling-up structures ( Li et al., 2013 Chen et al., 2021), membranes ( Ma et al., 2014), etc. Theoretical analysis and numerical simulations are performed to demonstrate the perfect two- and three-beam splitting performances based on local power conservation. The mirror reflected wave is suppressed for equal two-beam splitting case and allowed for three-beam splitting case. The amplitudes and power flows of different reflected beams can be manipulated by changing the groove parameters. In this paper, we propose a simple acoustic metagrating with periodic grooves that can split a normally incident beam into two or three reflected beams. Key Laboratory of Pressure Systems and Safety of MOE, School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, ChinaĪcoustic metasurfaces have been widely explored and attracted great attention for their extraordinary wavefront manipulation abilities.Each point on the wavefront emits a semicircular wavelet that moves a distance \(s = vt\).Ailing Song Chaoyu Sun Yanxun Xiang* Fu-Zhen Xuan \): Huygens’s principle applied to a straight wavefront.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |