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Updated: Jun 1, 2026

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
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Homogeneous optical cloak constructed with uniform layered structures.

Jingjing Zhang1, Liu Liu, Yu Luo

  • 1DTU Fotonik-Department of Photonics Engineering, Technical University of Denmark, Kongens Lyngby, Denmark. jinz@fotonik.dtu.dk

Optics Express
|June 7, 2011
PubMed
Summary

Researchers created a new, simple invisibility cloak using a uniform silicon grating. This homogenous cloak works at near-infrared frequencies and allows for larger hidden objects, moving cloaking technology closer to reality.

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Area of Science:

  • Physics
  • Materials Science
  • Optics

Background:

  • Invisibility cloaks, a long-sought goal, are becoming reality through transformation optics.
  • Existing cloaks often require complex designs with spatially varying refractive indices.
  • Current cloaking methods typically conceal small objects relative to the cloak's size.

Purpose of the Study:

  • To experimentally realize a homogenous invisibility cloak.
  • To demonstrate a simplified design strategy for invisibility cloaks.
  • To achieve broadband invisibility at near-infrared frequencies.

Main Methods:

  • Utilizing a uniform silicon grating structure for cloak fabrication.
  • Employing transformation optics principles with a homogenous material.

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  • Experimental verification of cloaking performance at near-infrared wavelengths.

    • Main Results:

    • Successful experimental realization of a homogenous invisibility cloak.
    • Demonstration of broadband invisibility behavior.
    • Achieved a large obstacle-to-cloak size ratio.

    Conclusions:

    • Homogenous invisibility cloaks offer a simplified design approach.
    • Uniform layered media can be used for invisibility across various frequencies.
    • This research advances practical applications of cloaking technology.