应用单层超表面实现声波宽角度非对称传输
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摘要
利用单层梯度超表面结构,设计并模拟验证了一种实现声波非对称传输的方法,在较宽的角度范围内实现了高对比度的声波非对称传输。经过恰当的超表面结构设计后,负折射现象实现了声波的正向导通;高阶衍射的抑制导致了反向入射的声波传输被禁止。基于广义斯涅耳定律分析了非对称传输的原理,采用有限元法的数值模拟结果很好地验证了理论分析。研究结果在噪声控制、超声整流或治疗等方面具有潜在的应用价值。
Based on the single-layer acoustic gradient-index metasurface,a method of realizing acoustic asymmetric transmission is designed and simulated.The asymmetric transmission exhibits the characteristics of wide-angle and high energy contrast.Via proper design of metasurface structure,positive propagation is permitted by negative refraction and negative propagation is prohibited by suppressing high order diffraction.The results of theoretical analysis using the generalized Snell's law agree well with those of simulation based on finite element method.The design has potential application values in noise control,ultrasonic rectification and treatment.
Based on the single-layer acoustic gradient-index metasurface,a method of realizing acoustic asymmetric transmission is designed and simulated.The asymmetric transmission exhibits the characteristics of wide-angle and high energy contrast.Via proper design of metasurface structure,positive propagation is permitted by negative refraction and negative propagation is prohibited by suppressing high order diffraction.The results of theoretical analysis using the generalized Snell's law agree well with those of simulation based on finite element method.The design has potential application values in noise control,ultrasonic rectification and treatment.
引文
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[2]ASSOUAR B,LIANG B,WU Y,et al.Acoustic metasurfaces[J].Nat.Rev.Mat.,2018,3(12):460-472.
[3]LI Y,QI S B,ASSOUAR B M.Theory of metascreen-based acoustic passive phased array[J].New J.Phys.,2016,18:043024-1-19.
[4]HAN L X,YAO Y W,ZHANG X,et al.Acoustic metasurface for refracted wave manipulation[J].Phys.Lett.A,2018,382(5):357-361.
[5]LI Y,LIANG B,GU Z M,et al.Reflected wavefront manipulation based on ultrathin planar acoustic metasurfaces[J].Sci.Rep.,2013,3:2546-1-6.
[6]QI S B,ASSOUAR B M.Ultrathin acoustic metasurfaces for reflective wave focusing[J].J.Appl.Phys.,2018,123(23):234501-1-8.
[7]QI S B,LI Y,ASSOUAR B M.Acoustic focusing and energy confinement based on multilateral metasurfaces[J].Phys.Rev.Applied,2017,7(5):054006-1-16.
[8]LI Y,ASSOUAR B M.Acoustic metasurface-based perfect absorber with deep subwavelength thickness[J].Appl.Phys.Lett.,2016,108(6):063502-1-4.
[9]林洲,郭霞生,程建春,等.声二极管中声传播模型研究[J].声学技术,2013,32(5):353-356.LIN Zhou,GUO Xiasheng,CHENG Jianchun,et al.Research on sound propagation model in acoustic diode[J].Technical Acoustics,2013,32(5):353-356.
[10]KAN W W,LIANG B,ZHU X F,et al.Acoustic one-way frequency up-converter with high transmission efficiency[J].J.Appl.Phys.,2013,114(13):134508-1-6.
[11]程营,吴大建,刘晓峻.表面声学超构材料中的非对称声传输研究[J].声学技术,2013,32(5):33-34.CHENG Ying,WU Dajian,LIU Xiaojun.Asymmetrical transmission of sound wave in acoustic surface metamaterials[J].Technical Acoustics,2013,32(6):33-34.
[12]HE Z J,PENG S S,YE Y T,et al.Asymmetric acoustic gratings[J].Appl.Phys.Lett.,2011,98(8):083505-1-3.
[13]SONG A L,CHEN T N,WANG X P,et al.Waveform-preserved unidirectional acoustic transmission based on impedancematched acoustic metasurface and phononic crystal[J].J.Appl.Phys.,2016,120(8):085106-1-7.
[14]CHEN D C,ZHU X F,WEI Q,et al.Asymmetric phase modulation of acoustic waves through unidirectional metasurfaces[J].Appl.Phys.A,2018,124(1):1-6.
[15]SHEN C,XIE Y B,LI J F,et al.Asymmetric acoustic transmission through near-zero-index and gradient-index metasurfaces[J].Appl.Phys.Lett.,2016,108(22):223502-1-4.
[16]LI Y,SHEN C,XIE Y B,et al.Tunable asymmetric transmission via lossy acoustic metasurfaces[J].Phys.Rev.Lett.,2017,119(3):035501-1-5.
[17]LIU B Y,JIANG Y Y.Controllable asymmetric transmission via gap-tunable acoustic metasurface[J].Appl.Phys.Lett.,2018,112(17):173503-1-5.
[18]周光平,杨奇,李自光,等.超声换能器激励的板声源振动特性的有限元分析[J].声学技术,2007,26(2):326-329.ZHOU Guangping,YANG Qi,LI Ziguang,et al.Finite element analysis of transducer-driven vibration of plate[J].Technical Acoustics,2007,26(2):326-329.
[19]WANG Z,YU T B,WANG T B,et al.Acousto-optic interactions for terahertz wave using phoxonic quasicrystals[J].J.Phys.D:Appl.Phys.,2018,51(10):1-10.
[20]YU T B,WANG Z,LIU W X,et al.Simultaneous large band gaps and localization of electromagnetic and elastic waves in defect-free[J].Opt.Express,2016,24(8):7951-7959.
[21]YU N F,GENEVET P,KATS M,et al.Light propagation with phase discontinuities:Generalized laws of reflection and refraction[J].Science,2011,334(6045):333-337.
[22]QIAN E T,FU Y Y,XU Y D,et al.Total omnidirectional reflection by sub-wavelength gradient metallic gratings[J].Europhys.Lett.,2016,114(3):34003-1-5.
[23]MEI J,WU Y.Controllable transmission and total reflection through an impedance-matched acoustic metasurface[J].New J.Phys.,2014,16:123007-1-11.
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