【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。更多还原

【Abstract】 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.更多还原