Scholarlink

<p>Metamaterials promise to revolutionize elastic devices, with applications spanning wireless communication, structural health monitoring and microfluidic technology. Nevertheless, unidirectionally manipulating broadband elastic waves remains challenging due to their inherent complexity of polarization. Here, we introduce a method to control the transmission of broadband Lamb waves unidirectionally by utilizing mode conversion and selection. The elastic meta-atoms showcased &#xa0;&gt;30 dB contrast in transmissions between forward and backward illumination scenarios within 251-345.9 kHz. Leveraging the disparity in phase velocities between <i>S</i><sub>0</sub>- and <i>A</i><sub>0</sub>-mode Lamb waves, the meta-atom enables broadband phase modulation. We realize a unidirectional focusing lens that exhibits a concentration of out-of-plane displacements for <i>S</i><sub>0</sub>-mode Lamb waves under forward excitation, while reflecting those excited backward. An enhanced unidirectionally-transmitted meta-atom displaying &#xa0;&lt;3 dB forward transmission within 293.3-333.6 kHz is further developed by incorporating an <i>A</i><sub>0</sub>-mode reflector. Our proposal advances the manipulation of broadband plate waves, holding significant potential for multifunctional on-chip elastic devices.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Unidirectional focusing for broadband Lamb guided wave based on mode conversion

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年3月28日

查看全文
  • Haifei Zhu,
  • Xuan Zhang,
  • Wenjie Liu,
  • Houyou Long,
  • Ying Cheng,
  • Xiaojun Liu

摘要

Metamaterials promise to revolutionize elastic devices, with applications spanning wireless communication, structural health monitoring and microfluidic technology. Nevertheless, unidirectionally manipulating broadband elastic waves remains challenging due to their inherent complexity of polarization. Here, we introduce a method to control the transmission of broadband Lamb waves unidirectionally by utilizing mode conversion and selection. The elastic meta-atoms showcased  >30 dB contrast in transmissions between forward and backward illumination scenarios within 251-345.9 kHz. Leveraging the disparity in phase velocities between S0- and A0-mode Lamb waves, the meta-atom enables broadband phase modulation. We realize a unidirectional focusing lens that exhibits a concentration of out-of-plane displacements for S0-mode Lamb waves under forward excitation, while reflecting those excited backward. An enhanced unidirectionally-transmitted meta-atom displaying  <3 dB forward transmission within 293.3-333.6 kHz is further developed by incorporating an A0-mode reflector. Our proposal advances the manipulation of broadband plate waves, holding significant potential for multifunctional on-chip elastic devices.