Acoustic waveguiding in a silicon carbide phononic crystals at microwave frequencies

Baboly, Mohammadhosein Ghasemi; Reinke, Charles M.; Griffin, Benjamin A.; El-Kady, Ihab F; Leseman, Zayd Chad

doi:10.1063/1.5016380

Cited by 33 publications

(12 citation statements)

References 36 publications

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“…The radii of the central and corner circles are r i and r o , respectively, and their center-to-center distance d io follows d io < r i + r o . Previous studies on snowflake-hole-based phononic waveguides had reported the edge-rounding effect and sizing errors in the fabrication process 34,35 . The rounding of sharp corners may dramatically change the mechanical response leading to discrepancies between numerical simulations and experimental data 36 .…”

Section: Resultsmentioning

confidence: 99%

Phononic topological insulators based on six-petal holey silicon structures

Ren

Lee

2019

Sci Rep

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Since the discovery of the Quantum Spin Hall Effect, electronic and photonic topological insulators have made substantial progress, but phononic topological insulators in solids have received relatively little attention due to challenges in realizing topological states without spin-like degrees of freedom and with transverse phonon polarizations. Here we present a holey silicon-based topological insulator design, in which simple geometric control enables topologically protected in-plane elastic wave propagation up to GHz ranges with a submicron periodicity. By integrating a hexagonal lattice of six small holes with one central large hole and by creating a hexagonal lattice by themselves, our design induces zone folding to form a double Dirac cone. Based on the hole dimensions, breaking the discrete translational symmetry allows the six-petal holey silicon to achieve the topological phase transition, yielding two topologically distinct phononic crystals. Our numerical simulations confirm inverted band structures and demonstrate backscattering-immune elastic wave transmissions through defects including a cavity, a disorder, and sharp bends. Our design also offers robustness against geometric errors and potential fabrication issues, which shows up to 90% transmission of elastic waves even with 6% under-sized or 11% over-sized holes. These findings provide a detailed understanding of the relationship between geometry and topological properties and pave the way for developing future phononic circuits.

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Section: Resultsmentioning

confidence: 99%

Phononic topological insulators based on six-petal holey silicon structures

Ren

Lee

2019

Sci Rep

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“…[ 44 ] On the other hand, a hexagonal array of snowflake‐shaped inclusions with the unit cell size comparable with the wavelength etched into a thin plate opening a bandgap in GHz is considered a PnC. [ 45 ] A similar nomenclature convention applies to nanomaterials. Nonetheless, at the nanoscale, phonon transport beyond sub‐Kelvin (below 10 K) temperatures is highly nonlinear and a broader frequency spectrum of phonons contributes to the overall thermal conductivity.…”

Section: Size Effect On Phononic Crystals and Acoustic Metamaterialsmentioning

confidence: 99%

“…For example, Ash et al [ 203 ] fabricated a surface‐acoustic‐wave (SAW) PnC with finite‐depth annular holes as unit cells to create low‐frequency bandgaps within the sound line and up to an order‐of‐magnitude improved band gap extinction compared with pillared PnCs, shown in Figure a–d. By creating a path in the structure inside the bandgap frequency range, Ghasemi Baboly et al [ 45 ] created a conventional PnC waveguide in silicon carbide (SiC) to guide waves to transport along the path at frequencies within the bandgap, as shown in Figure 6i,j. Moreover, due to the higher‐phonon frequencies at the microscale, transition between acoustics and optics can be realized at this scale.…”

Section: Size Effect On Phononic Crystals and Acoustic Metamaterialsmentioning

confidence: 99%

Phonon Engineering of Micro‐ and Nanophononic Crystals and Acoustic Metamaterials: A Review

2022

Small Science

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Figure 2. a,e) Experimental specimens of a regular Kagome lattice (a) and a topological Kagome lattice (e). b,f ) Isofrequency contours (first phaseconstant surface in the first Brillouin zone) of regular (b) and topological (f ) Kagome lattices calculated from FEA. c,g) Group velocity isofrequency contours (frequency increasing from dark red to bright yellow) highlighting symmetric or asymmetric directivity of regular (c) and topological (g) lattices. d,h) Snapshots of experimentally acquired wave fields in regular (d) and topological (h) lattices, confirming symmetric or asymmetric propagation. Colors denotes the magnitude of the scan point velocities, normalized by the largest value at the considered instants. a-h) Reproduced with permission. [40]

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“…Lately, AMMs have been attracted attention due to the distinctive characteristic of acoustic or elastic waves not being propagated at the specific frequency. Different from single-negative AMMs are mainly used for vibration isolation (An et al, 2020;Chen et al, 2021;Huang et al, 2021), AMMs with doublenegative characteristics can be used in unique device designing such as acoustic cloaking (Chen and Chan, 2007;Munteanu and Chiroiu, 2011;Zheng et al, 2014), acoustic imaging (Deng et al, 2009;Molerón and Daraio, 2015;Laureti et al, 2016), waveguiding (Casadei et al, 2012;Cao et al, 2018;Ghasemi Baboly et al, 2018;Cao et al, 2019;Sirota et al, 2021), and acoustic focusing (Li et al, 2012;Al Jahdali and Wu, 2016;Chen et al, 2018). The tunable AMMs also be proposed to provide multiple functions, such as active acoustic metalens (Zhang et al, 2021) and tunable acoustic metasurface (Cao et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Discrepancies Between Two-Dimensional and Three-Dimensional Acoustic Metamaterials

et al. 2021

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In order to get insight information of the band structure of acoustic metamaterials (AMMs) in condensed matter, periodic lattice structures are analyzed using Bloch’s theorem. Typical approaches of the band structure computation methods, topology optimization, and tunable abilities cannot overcome the gap between the two-dimensional (2D) AMMs theoretical and three-dimensional (3D) specimens’ experimental data yet. In this work, the variation in the results of the band structure obtained from the 2D mathematical model computed with respect to the 3D experimental models, and related cause of the variation is explored. The band structures and mode shapes of the 2D AMMs, quasi-2D models, and 3D specimen models are followed to reveal the boundary conditions and source for the observed differences in band structures. The cause for the discrepancies is verified by using the finite element method (FEM) with corresponding boundary conditions. It is found that outcomes from computational data of the 2D AMMs model are diverted significantly by means of bandgap, band structure, and stress distribution in counterparts of the 3D specimen model. This approach can provide assistance for computing the band structure of 2D AMMs for practical applications.

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Acoustic waveguiding in a silicon carbide phononic crystals at microwave frequencies

Cited by 33 publications

References 36 publications

Phononic topological insulators based on six-petal holey silicon structures

Phononic topological insulators based on six-petal holey silicon structures

Phonon Engineering of Micro‐ and Nanophononic Crystals and Acoustic Metamaterials: A Review

Numerical Investigation of Discrepancies Between Two-Dimensional and Three-Dimensional Acoustic Metamaterials

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