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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 22 — Oct. 26, 2009
  • pp: 19947–19959

Compact-sized and broadband carpet cloak and free-space cloak

Hui Feng Ma, Wei Xiang Jiang, Xin Mi Yang, Xiao Yang Zhou, and Tie Jun Cui  »View Author Affiliations


Optics Express, Vol. 17, Issue 22, pp. 19947-19959 (2009)
http://dx.doi.org/10.1364/OE.17.019947


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Abstract

Recently, invisible cloaks have attracted much attention due to their exciting property of invisibility, which are based on a solid theory of transformation optics and quasi-conformal mapping. Two kinds of cloaks have been proposed: free-space cloaks, which can render objects in free space invisible to incident radiation, and carpet cloaks (or ground-plane cloaks), which can hide objects under the conducting ground. The first free-space and carpet cloaks were realized in the microwave frequencies using metamaterials. The free-space cloak was composed of resonant metamaterials, and hence had restriction of narrow bandwidth and high loss; the carpet cloak was made of non-resonant metamaterials, which have broad bandwidth and low loss. However, the carpet cloak has a severe restriction of large size compared to the cloaked object. The above restrictions become the bottlenecks to the real applications of free-space and carpet cloaks. Here we report the first experimental demonstration of broadband and low-loss directive free-space cloak and compact-sized carpet cloak based on a recent theoretical study. Both cloaks are realized using non-resonant metamaterials in the microwave frequency, and good invisibility properties have been observed in experiments. This approach represents a major step towards the real applications of invisibility cloaks.

© 2009 Optical Society of America

OCIS Codes
(220.0220) Optical design and fabrication : Optical design and fabrication
(160.3918) Materials : Metamaterials

ToC Category:
Metamaterials

History
Original Manuscript: August 31, 2009
Revised Manuscript: October 9, 2009
Manuscript Accepted: October 11, 2009
Published: October 19, 2009

Citation
Hui Feng Ma, Wei Xiang Jiang, Xin Mi Yang, Xiao Yang Zhou, and Tie Jun Cui, "Compact-sized and broadband carpet cloak and free-space cloak," Opt. Express 17, 19947-19959 (2009)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-22-19947


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