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Transformation-Invariant Metamaterials.

Youming Zhang1, Yu Luo2, J B Pendry3

  • 1Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore.

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|September 7, 2019
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Summary
This summary is machine-generated.

Researchers developed anisotropic doping for epsilon-near-zero (ENZ) media, enabling omnidirectional impedance matching and ideal transformation optical devices like invisibility cloaks. This breakthrough advances ENZ media applications.

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Area of Science:

  • Photonics
  • Materials Science
  • Metamaterials

Background:

  • The concept of doping, fundamental to semiconductors, has been adapted for photonics using epsilon-near-zero (ENZ) media.
  • Doping ENZ media with nonmagnetic impurities can induce significant magnetism, but typically results in isotropic materials.
  • Isotropic ENZ media face limitations in achieving impedance matching across all incident angles for optical applications.

Purpose of the Study:

  • To extend the photonic doping approach in ENZ media by introducing anisotropy.
  • To enable full transparency and omnidirectional impedance matching in doped ENZ media.
  • To create a transformation-invariant material platform for ideal transformation optical devices.

Main Methods:

  • Introducing anisotropy into the doping of epsilon-near-zero (ENZ) media.
  • Developing transformation-invariant materials by controlling anisotropy.
  • Demonstrating an omnidirectional invisibility cloak using the proposed material.

Main Results:

  • Anisotropically doped ENZ media achieve full transparency with omnidirectional impedance matching.
  • These materials exhibit transformation-invariant properties, maintaining material parameters under coordinate transformations.
  • A full-parameter omnidirectional invisibility cloak was successfully demonstrated, hiding objects from diverse incident angles.

Conclusions:

  • Anisotropic doping of ENZ media offers a powerful platform for advanced optical devices.
  • This approach overcomes limitations of isotropic ENZ media, enabling broader applications.
  • The developed transformation-invariant material is a significant step towards practical realization of ideal transformation optics.