Acoustic invisibility cloak based on two-dimensional solid-fluid phononic crystals

Ghoreshi, Mahdiyeh; Bahrami, Ali

doi:10.1016/j.ssc.2021.114646

Cited by 19 publications

(6 citation statements)

References 24 publications

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“…Compared with the electromagnetic wave band gap of a photonic crystal, they defined a concept of an elastic wave/acoustic wave band gap phononic crystal (Sigalas and Economou, 1992). Due to its band gap, defect state and other characteristics, scholars have carried out extensive research on phononic crystals in the fields of ship and ocean, aerospace engineering and construction (Yin et al, 2022), such as low-frequency vibration isolation/sound insulation/absorption (Chu et al, 2023;Zou et al, 2023;Zuo et al, 2022), subwavelength acoustic focusing (Yang et al, 2022;Yao et al, 2021), acoustic/elastic wave cloak design (Ghoreshi and Bahrami, 2022), ultrahigh frequency resonators (Yao et al, 2021), wave filters (Lee et al, 2023), etc.…”

Section: Introductionmentioning

confidence: 99%

Ultrahigh frequency vibration control in a piezoelectric phononic crystal beam at the nanoscale considering surface effects

Zhang,

Qian,

Ren

et al. 2023

Journal of Theoretical and Applied Mechanics

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In this paper, a piezoelectric phononic crystal beam at the nanoscale has been mechanically modeled by using the surface piezoelectric theory. The band gap has been calculated by the plane wave expansion method and the band gap structure picture has been analyzed. The influence of electromechanical coupling effects, surface effects and geometry on the band gap properties are discussed separately. This study contributes positively to the design and active control of nanoelectromechanical systems.

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Section: Introductionmentioning

confidence: 99%

Ultrahigh frequency vibration control in a piezoelectric phononic crystal beam at the nanoscale considering surface effects

Zhang,

Qian,

Ren

et al. 2023

Journal of Theoretical and Applied Mechanics

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“…That is why researchers were looking for new methods with new technologies for invisibility. The use of unique features of photonic crystals for invisibility applications and the similarity of phononic crystals to them has made it possible to use phononic crystals for invisibility applications [16,17]. Phononic crystals (PnCs) are 1D, 2D, or 3D elastic periodic structures used to control and give direction the acoustic waves [18].…”

Section: Introductionmentioning

confidence: 99%

“…In this way, the waves are splitted into two parts by colliding with the negative refractive crystal. Then, to prevent the waves from entering the invisibility area, a crystal with SC property is placed in the path of wave movement until the waves reach the back of the structure without scattering [17].…”

Section: Introductionmentioning

confidence: 99%

Reciprocal invisibility cloaking with self-collimation effect of phononic crystals

Ghoreshi¹,

Bahrami²

2022

Phys. Scr.

Self Cite

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In this paper, the combination of self-collimation property and the existence of band gap in two-dimensional phononic crystals are used to design the cloak and change the direction of waves for that the waves do not collide with the object. Because the waves do not hit the object, the performance of structure will not have any dependence on the shape of the hidden object. The operating fRequency for the structure is chosen as 3 kHz, which is part of the human audio frequency and can be used for sound insulation. To prove the invisibility, the pressure of the reflected waves, the waves reaching the invisibility area, and the waves reaching the back of the object are calculated. In this way, it is shown that the reflection from the structure is below 0.1 and the intensity of waves reached to the back of the structure is approximately the same as that waves reached there in the absence of the object. An obvious and important feature of this structure is that, if the hidden object is a source producing the same frequency as the external source, this invisibility coating prevents the waves from reaching the detectors. In other words, the sound waves of the person inside the invisibility area will not be detectable by detectors.

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“…12) Zhan et al designed a sonic demultiplexer consisting of multiple tunable Mach-Zehnder interference structures based on the self-collimated beams in 2D SCs. 13) Other interesting acoustical processes, such as one-way transmission, 14) acoustic sensing, 15) acoustic focusing and imaging 16) and acoustical cloaking, 17) together with acoustic functional devices, [18][19][20] have significantly extended the application of self-collimated sound beams.…”

mentioning

confidence: 99%

Acoustical routing based on diffraction inhibition in two-dimensional sonic crystal

Ting,

Qiang,

Chengwen

et al. 2023

Appl. Phys. Express

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Routing and guiding acoustic waves without diffraction broadening and backscattering losses are of great interest in the acoustic community. Here we have proposed a diffraction-immune acoustical waveguides based on diffraction inhibition in two-dimensional (2D) sonic crystals (SCs). Owing to the flat equal-frequency contour, the propagating acoustic waves can be highly localized between two neighboring rows of the SCs. A few integrated sonic circuit building blocks including arbitrary angle bends and power splitters are further designed and theoretically realized. The proposed SCs opens up possibilities for flexible controls of acoustic waves and leads to applications in integrated acoustical devices.

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Acoustic invisibility cloak based on two-dimensional solid-fluid phononic crystals

Cited by 19 publications

References 24 publications

Ultrahigh frequency vibration control in a piezoelectric phononic crystal beam at the nanoscale considering surface effects

Ultrahigh frequency vibration control in a piezoelectric phononic crystal beam at the nanoscale considering surface effects

Reciprocal invisibility cloaking with self-collimation effect of phononic crystals

Acoustical routing based on diffraction inhibition in two-dimensional sonic crystal

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