Self-collimation of Ultrasonic Waves in a Two-dimensional Prism-shaped Phononic Crystal

Kang, Hwi Suk; Lee, Kang Il

doi:10.3938/jkps.77.510

Cited by 3 publications

(1 citation statement)

References 23 publications

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“…Phononic crystals (PnCs) are 1D, 2D, or 3D elastic periodic structures used to control and give direction the acoustic waves [18]. Due to special features such as the presence of forbidden band gaps, negative refraction, and self-collimation effect, they have been used in many applications, including filters and splitters and we also use these properties to design the invisibility cloaking [19][20][21][22][23][24][25]. For example, in a phononic work for acoustic waves, the negative refractive and self-collimation (SC) properties of the crystal are used for invisibility.…”

Section: Introductionmentioning

confidence: 99%

Reciprocal invisibility cloaking with self-collimation effect of phononic crystals

Ghoreshi¹,

Bahrami²

2022

Phys. Scr.

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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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Section: Introductionmentioning

confidence: 99%

Reciprocal invisibility cloaking with self-collimation effect of phononic crystals

Ghoreshi¹,

Bahrami²

2022

Phys. Scr.

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

Ghoreshi

Bahrami

2022

Solid State Communications

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Sonic demultiplexer based on self-collimation beams

Zhan

Liu

Zhang

2022

Appl. Phys. Express

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The self-collimation effect of acoustic waves is a unique acoustic transmission phenomenon in two-dimensional (2D) phononic crystals (PCs), which has broad application prospects in acoustic wave regulation. In this paper, a sonic demultiplexer based on the self-collimation characteristics of 2D PCs is proposed. The sonic demultiplexer, which composed of three Mach-Zehnder interference structure in a 2D PCs, can demultiplex the incident acoustic waves that containing multiple frequencies. Moreover, the frequencies of the incident sound beams can be manipulated by adjusting the internal parameters of the demultiplexer. Potential applications include acoustic communication and acoustic signal processing, especially for underwater circumstance.

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Self-collimation of Ultrasonic Waves in a Two-dimensional Prism-shaped Phononic Crystal

Cited by 3 publications

References 23 publications

Reciprocal invisibility cloaking with self-collimation effect of phononic crystals

Reciprocal invisibility cloaking with self-collimation effect of phononic crystals

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

Sonic demultiplexer based on self-collimation beams

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