Integrated phononic crystal resonators based on adiabatically-terminated phononic crystal waveguides

Dehghannasiri, Razi; Pourabolghasem, Reza; Eftekhar, Ali A.; Adibi, Ali

doi:10.1063/1.4968614

Cited by 12 publications

(2 citation statements)

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“…(II) Waveguides, defect states, and filtering applications. If the travelling frequencies are located within a Bragg or a hybridization band gap of the background pillared structures, waveguides may be constructed consisting of different sizes of pillars or line-or curved-shape defects [59,78,81,[116][117][118][119][120][121][122][123][124][125][126][127]. Such design interventions can produce localized modes inside the Bragg or hybridization band gaps of the phononic crystal, hence allowing the propagation of confined modes in the waveguide.…”

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confidence: 99%

Physics of surface vibrational resonances: pillared phononic crystals, metamaterials, and metasurfaces

et al. 2021

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The introduction of engineered resonance phenomena on surfaces has opened a new frontier in surface science and technology. Pillared phononic crystals, metamaterials, and metasurfaces are an emerging class of artificial structured materials, featuring surfaces, that consist of pillars-or branching substructures-standing on a substrate or a plate. A pillared phononic crystal exhibits Bragg band gaps while a pillared metamaterial may feature both Bragg gaps and local-resonance hybridization gaps. These two band-gap phenomena, along with other unique wave dispersion characteristics, have been exploited for a variety of applications spanning a range of length scales and covering multipe disciplines in applied physics and engineering. The placement of pillars on a semi-infinite surface has similarly provided new avenues for the control and manipulation of wave propagation, including Rayleigh and Love waves along the surface of substrates, as well as Lamb waves in plates-for frequencies ranging from Hz to several GHz. Even a finite placement of pillars along specific directions on a surface has been shown to offer unique functionality, such as steering a wavefront in the subwavelength regime. At the nanoscale, pillared membranes have been investigated and it was shown that atomic-scale resonances-stemming from the nanopillars-alter the fundamental nature of conductive thermal transport by reducing the group velocities and generating mode localization across the entire spectrum well into the THz regime. In this article, we first overview the history and development of pillared materials, then provide a detailed synopsis of a selection of key research topics that involve the utilization of pillars in different contexts. The following sections present a review of different configurations, properties, and 2 characteristics, namely: (i) fundamental vibrational and propagation properties of pillared plates; (ii) metamaterial phenomena in pillared plates including the opening of low and wide hybridization band gaps as well as super-resolution focusing; (iii) pillared metasurfaces and their wave steering functions;(iv) topologically protected phononic edge states in pillared plates; and (v) nanophononic metamaterials in the form of pillared membranes exhibiting exceptionally low in-plane thermal conductivity. Finally, we conclude by providing a short summary on the salient properties of pillared materials and structures and outlining some perspectives on the state of the field and its promise for further future development.

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Physics of surface vibrational resonances: pillared phononic crystals, metamaterials, and metasurfaces

et al. 2021

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“…Designing PnCs with UHF PnBGs are only the first step in developing a complete PnC-based signal processing platform in this frequency regime. The next logical step is to develop the frequency-selective building blocks such as PnC resonators [7,9,10] along with the devices that can guide the acoustic waves inside a phononic line defect (i.e., a PnC waveguide [11][12][13][14]). These building blocks can be combined by coupling the acoustic waves between PnC waveguides, [15] PnC resonators, [16] or a combination of the two [8] to form all-phononic signal processing systems.…”

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confidence: 99%

Waveguiding Effect in the Gigahertz Frequency Range in Pillar-based Phononic-Crystal Slabs

et al. 2018

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Waveguiding effect for a phononic crystal (PnC)-based device operating in the GHz frequency regime is experimentally demonstrated. To that end, a metallic pillar-based PnC membrane with a PnC bandgap (PnBG) in the GHz frequency range is designed, and based on that, an acoustic waveguide operating in the GHz regime is designed and fabricated. To characterize the fabricated PnC waveguide, a new set of focusing interdigital transducers (IDTs) is designed and fabricated, enabling efficient excitation and detection of acoustic signals inside the PnC waveguide. The finite element method (FEM) is used to study the acoustic properties of the proposed structures and optimize their design. Experimental evidence supporting the existence of waveguiding effect in the proposed structure in the GHz frequency regime is provided, showing reasonable agreement with the numerical calculations.

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Generalized coupled mode theory in phononic slab waveguides

Hashemzadeh

Ahmadi

Rostami

2022

Optik

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Integrated phononic crystal resonators based on adiabatically-terminated phononic crystal waveguides

Cited by 12 publications

References 18 publications

Physics of surface vibrational resonances: pillared phononic crystals, metamaterials, and metasurfaces

Physics of surface vibrational resonances: pillared phononic crystals, metamaterials, and metasurfaces

Waveguiding Effect in the Gigahertz Frequency Range in Pillar-based Phononic-Crystal Slabs

Generalized coupled mode theory in phononic slab waveguides

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