Finite frequency external cloaking with complementary bianisotropic media
Finite frequency external cloaking with complementary bianisotropic media
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DOI：
10.1364/oe.22.017387
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发表时间：
2014-07-14
期刊：
影响因子：
3.8
通讯作者：
Guenneau, Sebastien
中科院分区：
文献类型：
--
作者：
Liu, Yan;Gralak, Boris;Guenneau, Sebastien
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. (C) 2014 Optical Society of America
