Integer multi-wavelength gradient phase metagrating for perfect refraction: Phase choice freedom in supercella).

IF 2.1 2区 物理与天体物理 Q2 ACOUSTICS Journal of the Acoustical Society of America Pub Date : 2024-11-01 DOI:10.1121/10.0034239
Jiaqi Quan, Lin Xu, Yangyang Fu, Lei Gao, Huanyang Chen, Yadong Xu
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Abstract

Phase gradient metagratings (PGMs) reshape the impinging wavefront though the interplay between the linear adjacent phase increment inside supercells and the grating diffraction of supercells. However, the adjacent phase increment is elaborately designed by tuning the resonance of each subcell at a certain target frequency, which inevitably confines PGMs to operate only at the single frequency in turn. We notice that there exists a freedom of phase choice with a multi-2π increment in a supercell of PGMs, whereas conventional designs focus on the 2π increment. This freedom can induce a collaborative mechanism of surface impedance matching and multi-wavelength subcells, enabling the design of PGMs at multi-wavelengths. We further design and fabricate a supercell consisting of eight curved pipes to construct the two-wavelengths PGMs. The linear adjacent phase gradient of 0.25π at the fundamental frequency 3430 Hz is achieved, while the almost perfect transmission effect is observed due to the impedance match at the ends of curved pipes. In addition, the transmission field at the double frequency 6860 Hz is measured, whose refraction direction is consistent with that at 3430 Hz. This design strategy originated from phase choice freedom in the supercell and the experimental fabrication might stimulate applications on other multi-wavelength metasurfaces/metagratings.

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用于完美折射的整数多波长梯度相位元:超级舱中的相位选择自由度)。
相位梯度元胞(PGMs)通过超级子胞内部线性相位增量与超级子胞光栅衍射之间的相互作用来重塑冲击波面。然而,相邻相位增量是通过调整每个子单元在特定目标频率上的共振而精心设计的,这就不可避免地限制了 PGM 只能依次在单一频率上工作。我们注意到,在 PGM 的超级电池中,存在着多 2π 增量的相位选择自由,而传统设计只关注 2π 增量。这种自由度可促成表面阻抗匹配和多波长子电池的协作机制,从而实现多波长 PGM 的设计。我们进一步设计和制造了一个由八个弯曲管道组成的超级电池,以构建双波长 PGM。在基频 3430 Hz 处实现了 0.25π 的线性相邻相位梯度,同时由于弯曲管道两端的阻抗匹配,观察到了几乎完美的传输效果。此外,还测量了双频率 6860 Hz 的传输场,其折射方向与 3430 Hz 的传输场一致。这种设计策略源于超级电池中的相位选择自由度,其实验性制造可能会促进在其他多波长元表面/元阵列上的应用。
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来源期刊
CiteScore
4.60
自引率
16.70%
发文量
1433
审稿时长
4.7 months
期刊介绍: Since 1929 The Journal of the Acoustical Society of America has been the leading source of theoretical and experimental research results in the broad interdisciplinary study of sound. Subject coverage includes: linear and nonlinear acoustics; aeroacoustics, underwater sound and acoustical oceanography; ultrasonics and quantum acoustics; architectural and structural acoustics and vibration; speech, music and noise; psychology and physiology of hearing; engineering acoustics, transduction; bioacoustics, animal bioacoustics.
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