The Schoch effect mechanism analysis and its regulation of two dimensional three components phononic crystal

Chen, ZongWang; Yao, Yuanwei; Wu, Fugen; Zhang, Xin; Dong, Huafeng; Lu, Shui-Fang; Han, Lixiang

doi:10.1360/sspma2016-00475

Cited by 4 publications

(2 citation statements)

References 28 publications

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“…The phenomenon may also occur in the solid, as is known from experience and was also reported earlier on by Kutzner [21], Filippov [22] and others [23]. More sophisticated materials such as dielectric materials or phononic crystals may also exhibit the effect [24,25]. The phenomenon is often accompanied by a null strip in between a specular and a nonspecular reflected beam.…”

Section: Introductionsupporting

confidence: 57%

Rayleigh angle incident ultrasonic beam shape design influence on reflected beam

Declercq

2023

Acta Acust.

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Current evolutions in transducer design, such as phased arrays, but more importantly, metamaterials-based acoustic lenses, potentially enable generating specific beam shapes earlier unconsidered. It is known that the Schoch effect, when a bounded incident beam on a submerged solid reflects at the Rayleigh angle, depends on the beam width and the frequency. This work numerically explores the consequence of the shape of such beams on the Schoch effect and invites further experimental work. The study investigates square shapes and beams with exponential flanks compared to Gaussian reference profiles and incorporates diffraction upon sound propagation to resemble reality better. It is shown that stunning differences occur depending on the beam shape, particularly for square beams.

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Section: Introductionsupporting

confidence: 57%

Rayleigh angle incident ultrasonic beam shape design influence on reflected beam

Declercq

2023

Acta Acust.

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“…2009年, Herbison等 [6] 采用脉冲波代替时域谐波的新方法对Schoch位移进行定量测量. 2014年, Declercq [7] 实验研究了产生Schoch位移时超声波的能量转换. 2017年, 陈宗旺等 [8] 通过在常规材料与声子晶体的界面处引入缺陷(覆盖层), 通过调节覆盖层的厚度实现了巨大的正向Schoch位移.…”

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Negative Schoch displacement of two-dimensional acoustic metamaterials with near-zero refractive index

Liu¹,

Wu²,

Yao³

et al. 2021

Acta Phys. Sin.

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In this paper, the Schoch displacement at the interface between different two-dimensional triangular phononic crystal metamaterial and natural material is studied by using finite element software. As is well known, the Schoch displacement is highly dependent on the surface wave and leakage wave excited at the interface between different materials. So, the negative Schoch displacement can be more easily obtained by adding a suitable thickness of covering layer at the interface between metamaterial material and natural material. The numerical results show that when the negative Schoch displacement happens, the effective parameters of metamaterials are close to zero. It means that the effective refraction index is near to zero and the reduced frequency of the incident acoustic wave is correlated with the reduced frequency of the band gap. It is also found from the results that the reduced frequency of the incident acoustic wave is located at the edge of the band gap when the negative Schoch displacement occurs. The maximum of the metamaterial effective impedance and the maximum of the reflection coefficient are almost at the same frequency. The phase of the imaginary part of the reflection coefficient has a phase mutation in π rad at the corresponding frequency. The frequency of negative Schoch displacement is located in the first band gap of <i>MK</i> direction and near the upper boundary. The Schoch displacement at the interface between conventional materials is usually positive and negligible in previous reports. In this paper, the negative Schoch displacement is obtained by using the near-zero refraction index metamaterials. This not only enriches the physics contents of Schoch effect but also provides a theoretical reference for designing the acoustic devices based on acoustic wave displacement at the interface.

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Acoustic metasurface for refracted wave manipulation

et al. 2018

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The Schoch effect mechanism analysis and its regulation of two dimensional three components phononic crystal

Cited by 4 publications

References 28 publications

Rayleigh angle incident ultrasonic beam shape design influence on reflected beam

Rayleigh angle incident ultrasonic beam shape design influence on reflected beam

Negative Schoch displacement of two-dimensional acoustic metamaterials with near-zero refractive index

Acoustic metasurface for refracted wave manipulation

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