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Related Experiment Video

Updated: May 18, 2026

Convergent Polishing: A Simple, Rapid, Full Aperture Polishing Process of High Quality Optical Flats & Spheres
13:07

Convergent Polishing: A Simple, Rapid, Full Aperture Polishing Process of High Quality Optical Flats & Spheres

Published on: December 1, 2014

Optimizing imperfect cloaks to perfection.

Liang-Wu Cai1

  • 1Department of Mechanical and Nuclear Engineering, Kansas State University, Manhattan, Kansas 66506, USA.

The Journal of the Acoustical Society of America
|October 9, 2012
PubMed
Summary
This summary is machine-generated.

This study shows that perfect cloaking is achievable without material singularity using layered cloak designs. Optimization allows for reduced scattering, overcoming a key physical realization challenge for cloaking devices.

Related Experiment Videos

Last Updated: May 18, 2026

Convergent Polishing: A Simple, Rapid, Full Aperture Polishing Process of High Quality Optical Flats & Spheres
13:07

Convergent Polishing: A Simple, Rapid, Full Aperture Polishing Process of High Quality Optical Flats & Spheres

Published on: December 1, 2014

Area of Science:

  • Physics
  • Metamaterials
  • Acoustics
  • Electromagnetics

Background:

  • Transformation optics enables cloaking device design for various waves.
  • Existing designs necessitate material singularity, with properties approaching zero or infinity at interfaces.
  • This poses significant challenges for the physical realization of cloaking devices.

Purpose of the Study:

  • To investigate whether material singularity is a mandatory requirement for achieving perfect cloaking.
  • To demonstrate that perfect cloaking can be realized without material singularity through optimization.

Main Methods:

  • Utilized optimization techniques to adjust material properties of layered cloak constructions.
  • Maintained constant geometries throughout the optimization process.
  • Applied the method to two distinct examples, including one based on acoustic cloaking prescriptions.

Main Results:

  • Achieved perfect cloaking without material singularity in numerical computations.
  • Reduced the normalized total scattering cross section to 0.002 (0.2%) or lower in both examples.
  • Demonstrated the effectiveness of optimization in cloaking penetrable objects and isolating resonances.

Conclusions:

  • Material singularity is not a prerequisite for perfect cloaking.
  • Layered cloak designs combined with optimization offer a viable path for practical cloaking realization.
  • The demonstrated optimization approach has broad applicability in advanced cloaking applications.