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  • AIP Publishing  (39)
  • 1
    Online Resource
    Online Resource
    Mode converter of vortex beams by phase-gradient acoustic metagratings
    AIP Publishing ; 2023
    In:  Journal of Applied Physics Vol. 133, No. 3 ( 2023-01-21)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 133, No. 3 ( 2023-01-21)
    Abstract: Recently, acoustic vortices with orbital angular momentum (OAM) have attracted great attention and interest owing to their extensive applications. Based on the generalized Snell’s law (GSL), acoustic vortex beams can be observed by constructing different types of acoustic metasurfaces immersed into cylindrical waveguides. However, owing to the restrictions of the phase gradient of metasurface structures and the critical order of propagating vortex beams, there exist great challenges in realizing complex modulation of vortex beams and designing advanced multifunctional sound devices. Here, we theoretically study and experimentally demonstrate the extended GSL in designing a mode converter of vortex beams based on phase-gradient acoustic metagratings (AMs). We demonstrate that the extended GSL can not only accurately predict the transmitted or reflected orders of vortex beams created by a series of AMs with arbitrary phase gradient ξ, but also effectively overcome the limitations of both the phase gradient and the critical order. More importantly, we design a type of mode converter of vortex beams and realize the mode conversion of output vortex beams by simply modulating the orders of input vortex beams. To present it, we experimentally demonstrate the switch between the output vortex beams with the orders of −2 and 2 through the same phase-gradient AM by using the input vortex beams with the orders of 1 and −1, respectively, which can be separately predicted by the GSL and the extended GSL. Our work paves a way for the complex modulation of acoustic vortex beams and the design of multifunctional OAM-based sound devices with practical applications.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/5.0130015
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 2
    Online Resource
    Online Resource
    Three-dimensional acoustic asymmetric focusing by mode-conversion structure
    AIP Publishing ; 2023
    In:  Journal of Applied Physics Vol. 134, No. 8 ( 2023-08-28)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 134, No. 8 ( 2023-08-28)
    Abstract: Acoustic asymmetric focusing (AAF) has attracted widespread attention owing to its great potential in medical ultrasound. The recent development of acoustic metamaterials and metasurfaces has provided various concepts to achieve AAF systems. Generally, the previously demonstrated AAF lenses were limited to one-dimensional structures, leading to difficulties in practical applications. The realization of AAF in three-dimensional (3D) space based on a two-dimensional (2D) device still remains a challenge. Here, we experimentally and numerically study a 2D AAF lens based on mode converters composed of two pairs of phased unit cells I and II and a step waveguide. Based on the phase profile of sound focusing and the step waveguide of mode converters, we experimentally design and demonstrate a type of 2D AAF lens and observe acoustic focusing and asymmetric transmission simultaneously in 3D space under the excitation of the zero-order wave. Both the phenomena arise from the phase modulation of the lens and the cutoff frequency of the first-order wave for the step waveguide, respectively. The fractional bandwidth (the ratio of the bandwidth to the center frequency) of the lens can reach about 0.14. The proposed 2D AAF lens, as well as its associated mode converter, paves the way for the asymmetric manipulation of sound in 3D space that has potential applications in practical sound devices.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/5.0162326
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 3
    Online Resource
    Online Resource
    Multifunctional reflected lenses based on aperiodic acoustic metagratings
    AIP Publishing ; 2021
    In:  Applied Physics Letters Vol. 119, No. 17 ( 2021-10-25)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 119, No. 17 ( 2021-10-25)
    Abstract: Acoustic metagratings (AMs) have provided diverse routes for sound modulations based on high-efficiency diffractions created by periodic supercell structures. The emergence of the extension of the generalized Snell's law (GSL), covering both acoustic diffractions and phase modulations, has promoted the design of the AMs with aperiodic phase profiles, which have a great potential in designing high-performance multifunctional devices. However, the realization of reflected aperiodic AMs and its associated multifunctional devices remain a challenge. To overcome this, we here theoretically design and experimentally demonstrate a class of reflected aperiodic AMs and multifunctional acoustic lenses. By using the extension of the GSL, we can overcome the limitations of the GSL (such as the phase gradient and the incident critical angle) and experimentally demonstrate theoretical predictions of sound reflections created by the aperiodic AMs with arbitrary phase gradients under a full-angle incidence. Additionally, we experimentally design a multifunctional reflected lens composed of two selected aperiodic AMs. Interestingly, by simply adjusting the incident angle of sound, we can realize the transformation between the beam splitting and the Bessel-like beam without changing the structure of the lens. Our work paves a way for modulating sound reflections and designing reflected multifunctional devices with promising applications.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/5.0068015
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 4
    Online Resource
    Online Resource
    Influence of viscoelastic property on laser-generated surface acoustic waves in coating–substrate systems
    AIP Publishing ; 2011
    In:  Journal of Applied Physics Vol. 109, No. 7 ( 2011-04-01)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 109, No. 7 ( 2011-04-01)
    Abstract: Taking account of the viscoelasticity of materials, the pulsed laser generation of surface acoustic waves in coating–substrate systems has been investigated quantitatively by using the finite element method. The displacement spectra of the surface acoustic waves have been calculated in frequency domain for different coating–substrate systems, in which the viscoelastic properties of the coatings and substrates are considered separately. Meanwhile, the temporal displacement waveforms have been obtained by applying inverse fast Fourier transforms. The numerical results of the normal surface displacements are presented for different configurations: a single plate, a slow coating on a fast substrate, and a fast coating on a slow substrate. The influences of the viscoelastic properties of the coating and the substrate on the attenuation of the surface acoustic waves have been studied. In addition, the influence of the coating thickness on the attenuation of the surface acoustic waves has been also investigated in detail.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.3553447
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2011
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 5
    Online Resource
    Online Resource
    Broadband acoustic logic gates in a circular waveguide with multiple ports
    AIP Publishing ; 2017
    In:  Applied Physics Letters Vol. 111, No. 24 ( 2017-12-11)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 111, No. 24 ( 2017-12-11)
    Abstract: We report both experimentally and numerically that a broadband acoustic logic gate is realized by multi-port circular waveguides immersed in air. The logic functions OR, NOT, AND, XOR, and XNOR are realized by the three-port and four-port circular waveguides with a uniform threshold in the range of 3640 Hz–8920 Hz, which arises from the linear interference mechanism by adjusting the phase difference and propagation path between two input signals. Besides, the complex logic NOR and NAND functions are obtained by the cascading of two basic logic gates, and interesting applications of the logic calculus C + A × B by the four-port circular waveguide are discussed in detail. Compared with other acoustic logic gates, the device has the advantages of broad bandwidth, uniform threshold, simple structure, and easy connection, which provides diverse routes to construct devices for acoustic communication and computation.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.5004645
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2017
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 6
    Online Resource
    Online Resource
    Multi-band asymmetric acoustic transmission in a bended waveguide with multiple mechanisms
    AIP Publishing ; 2016
    In:  Applied Physics Letters Vol. 109, No. 1 ( 2016-07-04)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 109, No. 1 ( 2016-07-04)
    Abstract: We report the realization of a multi-band device of the asymmetric acoustic transmission by placing a phononic crystal inside a bended waveguide immersed in water, as determined both experimentally and numerically. The asymmetric acoustic transmission exists in three frequency bands below 500 kHz induced by multiple mechanisms. Besides the band gap of the phononic crystal, we also introduce the deaf mode and interaction between the phononic crystal and waveguide. More importantly, this asymmetric transmission can be systematically controlled by mechanically rotating the square rods of the phononic crystal. The device has the advantages of multiple band, broader bandwidth, and adjustable property, showing promising applications in ultrasonic devices.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4955268
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2016
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 7
    Online Resource
    Online Resource
    A tunable acoustic diode made by a metal plate with periodical structure
    AIP Publishing ; 2012
    In:  Applied Physics Letters Vol. 100, No. 10 ( 2012-03-05)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 100, No. 10 ( 2012-03-05)
    Abstract: A model of acoustic diodes is realized by a thin brass plate with single-sided periodical grating structure immersed in water and studied both numerically and experimentally. The unidirectional transmission of acoustic waves is identified in two different frequency ranges, which can be systematically controlled by adjusting the sizes of the structural units. The results indicate that the acoustic diodes have the advantages of tunable frequency range, broader bandwidth, and simple structure as well as being easy to be achieved. The remarkable unidirectional transmission effect has great potential applications in ultrasonic devices, such as acoustic rectifiers, acoustic diodes, and related fields.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.3693374
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2012
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 8
    Online Resource
    Online Resource
    Multifunctional acoustic logic gates by valley sonic crystals
    AIP Publishing ; 2022
    In:  Applied Physics Letters Vol. 121, No. 12 ( 2022-09-19)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 121, No. 12 ( 2022-09-19)
    Abstract: The emergence of acoustic logic devices has attracted increasing attention owing to its great potential in logical operations and integrated acoustics. In recent years, various types of acoustic logic gates have successively been demonstrated based on artificial materials. However, simultaneous realization of acoustic logic devices with the characteristics of broad bandwidth and high robustness still poses a great challenge. To overcome this, we numerically design and experimentally demonstrate a multifunctional logic gate based on valley sonic crystals (VSCs). In a designed waveguide composed of two VSCs, a pair of valley edge states can be obtained in the domain wall. Additionally, we experimentally design a multifunctional logic gate composed of four VSCs. The logic functions OR and XOR with the fractional bandwidths of 0.24 and 0.19 can be realized at two output ports, which arises from both valley conservation and linear interference mechanisms. More importantly, we experimentally demonstrate the robustness of the logic gate by introducing a V-shaped defect, and the corresponding logic functions and their bandwidths created by the valley transport of edge states are almost immune to backscattering from the V-shaped defect. Compared with the previous acoustic logic gates, the proposed logic gate has the advantages of multifunctionality, broad bandwidth, and high robustness, which may have practical applications in advanced acoustic devices for computing and information processing.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/5.0112072
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 9
    Online Resource
    Online Resource
    Broadband unidirectional and omnidirectional bidirectional acoustic insulation through an open window structure with a metasurface of ultrathin hooklike meta-atoms
    AIP Publishing ; 2018
    In:  Applied Physics Letters Vol. 112, No. 24 ( 2018-06-11)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 112, No. 24 ( 2018-06-11)
    Abstract: We report the theoretical and experimental realization of an open window structure which exhibits the unusual properties of broadband unidirectional and omnidirectional bidirectional acoustic insulation. The open window is constructed by separate blades attached with metasurfaces of ultrathin hooklike meta-atoms which can change the lateral momentum of acoustic waves. Such a manipulation of momentum leads to an acoustic blind region and enables broadband unidirectional acoustic transmission. By improving the phase distribution of the metasurfaces, the fractional bandwidth can reach about 0.36. Interestingly, by mechanically rotating the blades to oblique positions, the unidirectional acoustic transmission can be conveniently converted into omnidirectional bidirectional acoustic insulation. The proposed metasurfaces composed of the hooklike meta-atoms have the advantages of broad bandwidth, ultrathin thickness (about λ/12), and easy fabrication. Our work opens up an approach for advanced acoustic manipulation in tunnels and windows, which has great potential in applications such as noise control and architectural acoustics.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.5025812
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2018
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 10
    Online Resource
    Online Resource
    Broadband acoustic focusing by cavity structures with phase manipulations
    AIP Publishing ; 2017
    In:  Journal of Applied Physics Vol. 122, No. 24 ( 2017-12-28)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 122, No. 24 ( 2017-12-28)
    Abstract: We numerically and experimentally realize broadband acoustic focusing lenses by employing units of phase manipulation composed of different numbers of cavity structures immersed in air, which is different from other units of phase manipulation by adjusting the structural parameters. The phase delays of transmitted units could cover a whole 2π range by using six cavity structures. Based on these units, we design a transmitted acoustic lens with different focal lengths, and the working bandwidth could reach about 2.1 kHz. Besides, the influence of air attenuation on the focusing performance and of the inclined angles of the channels in the cavity structure on the phase delays are discussed in detail. Moreover, we realize a transmitted acoustic lens with two types of units, a reflected acoustic lens and a three-dimensional transmitted acoustic lens. Compared with other acoustic lenses, the proposed acoustic lenses have the advantages of broad bandwidths, high focusing performance, easy fabrication, and high robustness, which have great potential applications in airborne acoustic focusing devices.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.4998223
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2017
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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