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Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...
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Linear systems are characterized by two main properties: superposition and homogeneity. Superposition allows the response to multiple inputs to be the sum of the responses to each individual input. Homogeneity ensures that scaling an input by a scalar results in the response being scaled by the same scalar.
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Microparticle Manipulation by Standing Surface Acoustic Waves with Dual-frequency Excitations
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当地非线性启用声波深度亚衍射控制声波的控制.

Jiaxin Zhong1,2, Chengbo Hu1, Kangkang Wang1

  • 1Key Laboratory of Modern Acoustics and Institute of Acoustics, Nanjing University, Nanjing 210093, China.

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概括

研究人员使用非线性效应克服了声学中的衍射极限. 他们实现了深度亚波长的空间分辨率,为成像和全息图等应用程序实现了先进的声音操纵.

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科学领域:

  • 声学 声学 声学 声学
  • 非线性物理学 非线性物理学
  • 波浪现象是一种波浪现象.

背景情况:

  • 衍射限制了声波场中的空间分辨率.
  • 由于这些限制,对声音的亚波长操纵具有挑战性.
  • 当前的方法难以生成和记录精细的物体细节.

研究的目的:

  • 为了克服声学空间分辨率的衍射极限.
  • 用非线性声学来证明声波的亚波长控制.
  • 探索局部非线性效应在实现这种控制中的作用.

主要方法:

  • 非线性声波传播的理论建模.
  • 拟议方法的实验验证.
  • 调查局部与累积非线性效应的研究.

主要成果:

  • 在远场中达到高达 λ/38 的深度亚波长空间分辨率.
  • 证明了超出衍射极限的声波的控制.
  • 确定了局部非线性效应对于亚衍射控制至关重要.

结论:

  • 非线性声学提供了一条超越常规衍射极限的途径.
  • 当地非线性效应是实现深度亚波长声学分辨率的关键.
  • 这一突破在声学全息图,成像和声音控制方面有潜在的应用.