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Symmetry-Protected Acoustic "Ghost Tunnels".

Changqing Xu1, Zihao Su2, Lingzhe Kong1

  • 1Nanjing Normal University, Key Laboratory of State Manipulation and Advanced Materials in Provincial Universities, School of Physics and Technology, Nanjing 210023, China.

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This summary is machine-generated.

Researchers developed acoustic "ghost tunnels" using nonlocal airborne acoustic metamaterials. These tunnels allow perfect sound wave transmission while appearing as empty space to external waves, enabling novel acoustic manipulation.

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Area of Science:

  • Acoustics
  • Metamaterials Science
  • Wave Physics

Background:

  • Nonlocal airborne acoustic metamaterials offer unique wave manipulation capabilities.
  • Acoustic wave tunneling and reflectionless properties are key areas in wave physics.

Purpose of the Study:

  • To propose and demonstrate acoustic
  • ghost tunnels
  • using nonlocal airborne acoustic metamaterials.
  • To enable perfect acoustic wave tunneling while maintaining a reflectionless property for external waves.

Main Methods:

  • Leveraging nonlocal airborne acoustic metamaterials.
  • Utilizing glide symmetries for protected doubly degenerate eigenstates with linear dispersions.
  • Employing broad-angle impedance matching with arc-shaped equal-frequency contours.
  • Selective excitation of specific eigenstates through different boundaries.

Main Results:

  • Demonstrated acoustic
  • ghost tunnels
  • that allow perfect wave transmission.
  • Achieved simultaneous reflectionless behavior for external incident waves.
  • Verified the concept through both numerical simulations and experimental validation.

Conclusions:

  • The proposed acoustic
  • ghost tunnels
  • establish a versatile paradigm for advanced acoustic manipulation.
  • This work opens new avenues for controlling sound waves in complex environments.