Three-dimensional broadband ground-plane cloak made of metamaterials
Open Access
- 1 June 2010
- journal article
- research article
- Published by Springer Science and Business Media LLC in Nature Communications
- Vol. 1 (1), 21-6
- https://doi.org/10.1038/ncomms1023
Abstract
Since invisibility cloaks were first suggested by transformation optics theory, there has been much work on the theoretical analysis and design of various types and a few experimental verifications at microwave and optical frequencies within two-dimensional limits. Here, we realize the first practical implementation of a fully 3D broadband and low-loss ground-plane cloak at microwave frequencies. The cloak, realized by drilling inhomogeneous holes in multi-layered dielectric plates, can conceal a 3D object located under a curved conducting plane from all viewing angles by imitating the reflection of a flat conducting plane. We also designed and realized, using non-resonant metamaterials, a high-gain lens antenna that can produce narrow-beam plane waves in the near-field region in a broad frequency band. The antenna constitutes the transmitter of the measurement system and is essential for the measurement of cloaking behaviour.Keywords
This publication has 26 references indexed in Scilit:
- Cloaking a metal object from an electromagnetic pulse: A comparison between various cloaking techniquesJournal of Applied Physics, 2010
- Silicon nanostructure cloak operating at optical frequenciesNature Photonics, 2009
- Complementary Media Invisibility Cloak that Cloaks Objects at a Distance Outside the Cloaking ShellPhysical Review Letters, 2009
- Broadband Invisibility by Non-Euclidean CloakingScience, 2009
- Hiding under the Carpet: A New Strategy for CloakingPhysical Review Letters, 2008
- Analytical design of conformally invisible cloaks for arbitrarily shaped objectsPhysical Review E, 2008
- Optical Design of Reflectionless Complex Media by Finite Embedded Coordinate TransformationsPhysical Review Letters, 2008
- Plasmonic materials in transparency and cloaking problems: mechanism, robustness, and physical insightsOptics Express, 2007
- Controlling Electromagnetic FieldsScience, 2006
- Determination of effective permittivity and permeability of metamaterials from reflection and transmission coefficientsPhysical Review B, 2002