Effects of rotation on a phononic crystal operated in whispering gallery modes

Ge, Fei; Zhao, Liye; Xu, Jiawen; Ding, Xukai

doi:10.1103/physrevb.109.024107

Phys. Rev. B

2024

DOI: 10.1103/physrevb.109.024107

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Effects of rotation on a phononic crystal operated in whispering gallery modes

Fei Ge,

Liye Zhao,

Jiawen Xu

et al.

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2024

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Cited by 2 publications

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A novel gyroscope based on the slow surface acoustic wave in a phononic metamaterial

Ge,

Zhao,

et al. 2024

Microsyst Nanoeng

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Limited to the direct modulation on the surface acoustic wave (SAW) by the rotation, the conventional SAW gyroscopes incur weak Coriolis effects and gyroscopic effects. In this paper, we innovatively utilize a phononic metamaterial (PM) operated at whispering-gallery modes (WGMs) as the vehicle for the Coriolis effect rather than SAW itself. The gyroscopic effects of this PM are investigated, and a new SAW gyroscope is subsequently proposed based on the slow SAW in PM. We show, combining theoretical modeling and finite element method simulation, that the rate of rotation can linearly induce the splitting of WGMs and modulate the phase velocity of SAW down to 4600 m/s (initial phase velocity of 5355 m/s); the direction of rotation results in the chiral symmetry of the PM vibration and the asymmetric distribution of the transmissive SAW. Besides, the proposed SAW gyroscope measures the angular velocity by detecting the phase shift resulting from rotation-dependent slow SAW in PM, obtaining a sensitivity of 0.016 deg/Hz when 50-cell PM. Compared with the existing SAW gyroscopes based on phase velocity modulation, the gyroscopic gain factor in this paper is enhanced by 430–1600 times. This work jumps out of the framework of directly modulating SAW in gyroscopes and provides an innovative scheme of the indirect modulations from the rotation-dependent PM on SAW, showing excellent performance and potential for angular velocity measurement in extreme environments.

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A novel gyroscope based on the slow surface acoustic wave in a phononic metamaterial

Ge,

Zhao,

et al. 2024

Microsyst Nanoeng

View full text Add to dashboard Cite

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Frequency-selective valley-edge transmission and channeling in phononic-crystal plates with dual topological modulations

Hsu,

Wei,

Huang

2024

Journal of Applied Physics

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In this numerical study, we propose dual-modulated topological pillared phononic crystal (PnC) plates and demonstrate their application in achieving frequency-selective waveguiding of Lamb-wave valley-edge states. We show that both the radius and the height of the pillars in the honeycomb unit cell can be varied, allowing a generalized parameter space to obtain the complete topological bandgaps and two groups of distinct valley Hall phases for designing topological waveguides operating in different frequency ranges. Accordingly, we construct different types of phase domain walls to support valley-edge states using the dual-modulated PnC plates with a lattice constant of 2000 μm and with topological bandgaps opened around the Dirac cone frequency of 426 kHz. The numerical results show that the valley-edge states emerge to cover different frequency ranges and exhibit robust backscattering immunity when propagating along zigzag paths with sharp corners. Furthermore, the transport path of the valley-edge states can be designed to be highly dependent on the operating frequency in different domain walls. Consequently, we design a straight waveguide and three multichannel waveguides to demonstrate frequency-dependent switchable transmission and selective channeling of valley-edge states, respectively. The results of this study pave the way for the development and optimization of topological acoustic circuits using the generalized parameter space approaches and are expected to find promising applications in frequency-controlled and signal-division devices.

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Effects of rotation on a phononic crystal operated in whispering gallery modes

Cited by 2 publications

References 50 publications

A novel gyroscope based on the slow surface acoustic wave in a phononic metamaterial

A novel gyroscope based on the slow surface acoustic wave in a phononic metamaterial

Frequency-selective valley-edge transmission and channeling in phononic-crystal plates with dual topological modulations

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