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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 14 — Jul. 14, 2014
  • pp: 17387–17402

Finite frequency external cloaking with complementary bianisotropic media

Yan Liu, Boris Gralak, Ross. C. McPhedran, and Sebastien Guenneau  »View Author Affiliations


Optics Express, Vol. 22, Issue 14, pp. 17387-17402 (2014)
http://dx.doi.org/10.1364/OE.22.017387


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Abstract

We investigate the twofold functionality of a cylindrical shell consisting of a negatively refracting heterogeneous bianisotropic (NRHB) medium deduced from geometric transforms. The numerical simulations indicate that the shell enhances their scattering by a perfect electric conducting (PEC) core, whereas it considerably reduces the scattering of electromagnetic waves by closely located objects when the shell surrounds a bianisotropic core. The former can be attributed to a homeopathic effect, whereby a small PEC object scatters like a large one as confirmed by numerics, while the latter can be attributed to space cancellation of complementary bianisotropic media underpinning anomalous resonances counteracting the field emitted by small objects (external cloaking). Space cancellation is further used to cloak a NRHB finite size object located nearby a slab of NRHB with a hole of same shape and opposite refracting index. Such a finite frequency external cloaking is also achieved with a NRHB cylindrical lens. Finally, we investigate an ostrich effect whereby the scattering of NRHB slabs and cylindrical lenses with simplified parameters hide the presence of small electric antennas in the quasi-static limit.

© 2014 Optical Society of America

OCIS Codes
(160.1190) Materials : Anisotropic optical materials
(160.1585) Materials : Chiral media
(050.1755) Diffraction and gratings : Computational electromagnetic methods
(160.3918) Materials : Metamaterials
(230.3205) Optical devices : Invisibility cloaks

ToC Category:
Metamaterials

History
Original Manuscript: March 24, 2014
Revised Manuscript: May 29, 2014
Manuscript Accepted: May 29, 2014
Published: July 10, 2014

Citation
Yan Liu, Boris Gralak, Ross. C. McPhedran, and Sebastien Guenneau, "Finite frequency external cloaking with complementary bianisotropic media," Opt. Express 22, 17387-17402 (2014)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-14-17387


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