Resonance switching in a large sonic crystal cavity

Alberti, Alejo; Spiousas, Ignacio; Gomez, Pablo M.; Eguía, Manuel C.

doi:10.1016/j.apacoust.2016.10.016

Cited by 2 publications

(4 citation statements)

References 22 publications

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“…If an angular frequency ω is chosen to satisfy conditions (18) or (19), the wavevector k θ becomes a pure imaginary value, or the wavevector acquires a negative value. The left-hand sides of the above equations can be rewritten in a summarized form as…”

Section: Analytical Calculation Of the Dispersion Relation Of An Equimentioning

confidence: 99%

“…[3][4][5][6][7] To overcome these limitations to make use of metamaterials in engineering applications, we can first refer to prior studies on this topic. [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] The concepts of metamaterials were utilized to overcome the diffraction limits of ultrasonic and acoustic devices or superlenses. [8][9][10]21 A superlens is a lens that utilizes metamaterials that function beyond the diffraction limit.…”

Section: Introductionmentioning

confidence: 99%

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An Acoustic Hyperlens with Negative Direction Based on Double Split Hollow Sphere

Choi

Yoon

2019

J. Theor. Comp. Acout.

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This study develops a new acoustic negative-refraction metamaterial that utilizes a synthesized double split hollow sphere (DSHS) for its unit cell. Recent relevant research has affirmed the concept that acoustic metamaterials can show unusual behavior that has not been observed in nature previously. However, as some hypothetical metamaterial designs have material properties not found in nature, the realization of practical metamaterials requires practical and complicated models. As a contribution to the development of acoustic metamaterials, the present study proposes a new anisotropic unit structure that encompasses Helmholtz resonators. This structure is referred to as the DSHS, is easy to manufacture, and has the advantage in that it uses the natural medium in its original form. By drawing the equifrequency or isofrequency contours of the designed two-dimensional (2D) anisotropic unit structure using the Floquet–Bloch’s principle, the properties of the present metamaterial can be understood. Numerical simulations are also conducted to identify and present the characteristics of the presented acoustic metamaterial. Through these, a new refraction phenomenon is identified that deviates from Snell’s law, and an acoustic hyperlens is numerically implemented that overcomes the diffraction limit.

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Section: Analytical Calculation Of the Dispersion Relation Of An Equimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An Acoustic Hyperlens with Negative Direction Based on Double Split Hollow Sphere

Choi

Yoon

2019

J. Theor. Comp. Acout.

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“…El transductor cilíndrico fue empleado por el Laboratorio de Acústica y Percepción Sonora (LAPSo, Universidad Nacional de Quilmes, CONICET) para caracterizar cristales sónicos [11], [12]. Los mismos constan de un arreglo Fig.…”

Section: Aplicación a Cristal Sónicounclassified

“…El estudio predice la aparición de bandas de frecuencias permitidas (el sonido es radiado fuera de la cavidad) y prohibidas (la cavidad actúa como si fuera "cerrada"). La respuesta en frecuencia obtenida con un micrófono en la cavidad mostró un incremento de presión acústico en el rango de frecuencias correspondiente a la banda prohibida, mostrando que la cavidad "resuena" [11], [12]. El uso del transductor iónico presentado y estudiado en este trabajo permitió verificar el comportamiento acústico del cristal sónico excitado con un frente de onda cilíndrico.…”

Section: Aplicación a Cristal Sónicounclassified

Generación de frentes de onda acústicos cilíndricos a través de parlantes iónicos

Gomez¹,

D'Onofrio²,

Santiago

2018

Elek.

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Presentamos la generación de frentes de onda acústicos cilı́ndricos usando transductores iónicos. Estos transductores están basados en la transferencia de momentum lineal por colisiones entre iones generados en una descarga corona y moléculas neutras. Dado que la forma de los electrodos puede ser elegida con gran flexibilidad, es posible obtener un flujo de aire que, en las vecindades del emisor, tiene asociado un frente de onda que se aparta de los conseguidos habitualmente con pistones planos. Mostramos las caracterı́sticas acústicas de un transductor cilı́ndrico y, como aplicación, el uso en el estudio de un filtro pasabanda basado en un cristal sónico.

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Resonance switching in a large sonic crystal cavity

Cited by 2 publications

References 22 publications

An Acoustic Hyperlens with Negative Direction Based on Double Split Hollow Sphere

An Acoustic Hyperlens with Negative Direction Based on Double Split Hollow Sphere

Generación de frentes de onda acústicos cilíndricos a través de parlantes iónicos

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