Guidance of surface waves in a micron-scale phononic crystal line-defect waveguide

Benchabane, Sarah; Gaiffe, Olivier; Salut, Roland; Ulliac, Gwenn; Laude, Vincent; Kokkonen, Kimmo

doi:10.1063/1.4913532

Cited by 63 publications

(41 citation statements)

References 19 publications

(17 reference statements)

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“…By using this engineered structure, the dispersion relation and bandgap of acoustic waves can be tailored and formed, which enables acoustic propagation to be controlled. For instance, a local modulation in the periodic geometry creates a cavity [34] and a waveguide [35][36][37][38] sustained by the bandgap, which spatially traps and guides acoustic waves, respectively. This PnC concept has been introduced into various micromechanical systems at microwave frequencies, including surface acoustic wave (SAW) devices [39,40], suspended nanobeams [6,7,15,16,41] and membranes [37,38,42].…”

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confidence: 99%

Real-Space Characterization of Cavity-Coupled Waveguide Systems in Hypersonic Phononic Crystals

Hatanaka

Yamaguchi

2020

Phys. Rev. Applied

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A phononic crystal formed in a suspended membrane provides full confinement of hypersonic waves and thus realizes a range of chip-scale manipulations. In this letter, we demonstrate the mode-resolved real-space characterization of the mechanical vibration properties in cavities and waveguide systems. Multiple resonant modes are independently characterized in various designed cavities, and wavelength-scale high-Q resonances up to Q = 4200 under atmospheric conditions are confirmed. This also reveals that the waveguide allows us to resolve single-mode wave transmission and thereby drive evanescently-coupled cavities. The methods offer a significant tool with which to build compact and low-power microwave phononic circuitry for signal processing and hybrid quantum system applications. * Electronic address: daiki.hatanaka.hz@hco.ntt.co.jp arXiv:1909.04827v1 [physics.app-ph]

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confidence: 99%

Real-Space Characterization of Cavity-Coupled Waveguide Systems in Hypersonic Phononic Crystals

Hatanaka

Yamaguchi

2020

Phys. Rev. Applied

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“…Experiments have directly demonstrated the trapping and guiding of surfaceguided elastic waves in linear defects in a micron-scale phononic crystal. 34 Based on the calculations of phononic characteristics in the finite size PnC model, the band modulation in PnC a)…”

Section: Introductionmentioning

confidence: 99%

Finite element analysis of surface modes in phononic crystal waveguides

Guo

Schubert

Dekorsy

2016

Journal of Applied Physics

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The study of surface modes in phononic crystal waveguides in the hypersonic regime is a burgeoning field with a large number of possible applications. By using the finite element method, the band structure and the corresponding transmission spectrum of surface acoustic waves in phononic crystal waveguides generated by line defects in a silicon pillar-substrate system were calculated and investigated. The bandgaps are caused by the hybridization effect of band branches induced by local resonances and propagating modes in the substrate. By changing the sizes of selected pillars in the phononic crystal waveguides, the corresponding bands shift and localized modes emerge due to the local resonance effect induced by the pillars. This effect offers further possibilities for tailoring the propagation and filtering of elastic waves. The presented results have implications for the engineering of phonon dynamics in phononic nanostructures.

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“…The sensitivity of coupling to the spatial distribution of the incident wavefront in the CRAW branches and the resultant output is demonstrated in figure 5. Both, bending and tunneling of waves in PnCs have been reported [3,27], but little has been reported on the impact that split channels with different modes can have on signal output. For this work, the input power into the emitting transducer in the bistatic setup was varied from 2 to 20 V, and the amplitude of the output in the frequency windows recorded (figures 5(c), (d)).…”

Section: Discussionmentioning

confidence: 99%

All-acoustic signal modulation and logic operation via defect induced cavity effects in phononic crystal coupled-resonator acoustic waveguides

Reyes

Walker²,

Zubov

et al. 2019

New J. Phys.

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A coupled resonant acoustic waveguide (CRAW) in a phononic crystal (PnC) was engineered to manipulate the propagation of ultrasonic waves within a conventional phononic bandgap for wavelength division multiplexing. The PnC device included two, forked, distinct CRAW waveguide channels that exhibited strong frequency and mode selectivity. Each branch was composed of cavities of differing volumes, with each giving rise to deep and shallow 'impurity' states. These states were utilized to select frequency windows where transmission along the channels was suppressed distinctly for each channel. Though completely a linear system, the mode sensitivity of each CRAW waveguide channel produced apparent nonlinear power dependence along each branch. Nonlinearity in the system arises from the combination of the mode sensitivity of each CRAW channel and small variations in the shape of the incident wavefront as a function of input power. The all-acoustic effect was then leveraged to realize an ultrasonic, spatial signal modulator, and logic element operating at 398 and 450 kHz using input power.

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Guidance of surface waves in a micron-scale phononic crystal line-defect waveguide

Abstract: Benchabane, S.; Gaiffe, O.; Salut, R.; Ulliac, G.; Laude, V.; Kokkonen, Kimmo Guidance of surface waves in a micron-scale phononic crystal line-defect waveguide

Cited by 63 publications

References 19 publications

Real-Space Characterization of Cavity-Coupled Waveguide Systems in Hypersonic Phononic Crystals

Real-Space Characterization of Cavity-Coupled Waveguide Systems in Hypersonic Phononic Crystals

Finite element analysis of surface modes in phononic crystal waveguides

All-acoustic signal modulation and logic operation via defect induced cavity effects in phononic crystal coupled-resonator acoustic waveguides

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