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Ultrathin carpet cloak enabled by infinitely anisotropic medium.

Mohammad Hosein Fakheri1, Ali Abdolali2

  • 1Applied Electromagnetic Laboratory, School of Electrical Engineering, Iran University of Science and Technology, Tehran, 1684613114, Iran.

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An ultrathin carpet cloak using an infinitely anisotropic medium (IAM) hides objects of any size and shape from all viewing angles. This novel material overcomes limitations of traditional transformation optics (TO) and metasurfaces for practical invisibility applications.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Electromagnetism

Background:

  • Transformation optics (TO) and metasurfaces have enabled advanced devices like invisibility cloaks.
  • Existing methods often result in bulky cloak designs, limiting real-world applications.
  • Current cloaking techniques face challenges in achieving broad viewing angles and thin profiles.

Purpose of the Study:

  • To propose an ultrathin carpet cloak using a novel anisotropic material.
  • To demonstrate cloaking of arbitrarily shaped objects from all incident angles.
  • To overcome the limitations of conventional transformation optics and metasurface cloaks.

Main Methods:

  • Utilizing coordinate transformation to design the cloak.
  • Employing an infinitely anisotropic medium (IAM) for cloak fabrication.
  • Conducting full-wave simulations to validate cloaking performance.
  • Implementing the IAM based on effective medium theory for proof of concept.

Main Results:

  • The proposed IAM-based carpet cloak achieves effective cloaking for arbitrary objects.
  • The cloak is significantly thinner than the concealed object, unlike previous TO approaches.
  • The IAM material circumvents complexities associated with conventional transformation optics.
  • Simulations confirm the cloak's ability to hide objects from all viewing angles.

Conclusions:

  • The developed ultrathin carpet cloak represents a significant advancement in invisibility technology.
  • The infinitely anisotropic medium offers a practical and efficient approach for cloak realization.
  • This work paves the way for broader applications of transformation optics devices.