Dispersive Behavior of Plasmonic and Metamaterial Coating on Achieving Transparency

Cloaking a Perfectly Conducting Sphere With Rotationally Uniaxial Nihility Media in Monostatic Radar System

“…Cloaking an object with suitable electromagnetic materials has attracted attention for many years [1,2,3,4,5,6]. One of the cloaking techniques utilizes low-positive, near-zero permittivity covers to induce "invisibility", which has been suggested in the quasistatic (Rayleigh) limit for spherical and cylindrical objects, i.e., the radius of a scatter being small compared with the operating wavelength [1].…”

Practical Limitations of an Invisibility Cloak

“…Compared to previous invisibility models [14][15][16]21], a transformation-based invisibility cloak is invisible from all incident directions and independent on the concealed object [1], which inspired a lot of interest and subsequent studies. To demonstrate the effectiveness of this transformation-based invisibility cloak, a simplified cloak was constructed with only normal incidence and one polarization [3], whose results show that scattering can be reduced for an object with radius less than one wavelength, but the scattering is still very large and far from being invisible.…”

Shaping the Radiation Pattern With Mu and Epsilon-Near-Zero Metamaterials

“…Many attractive properties due to their extraordinary effective parameter of permittivity ε or permeability µ have been analyzed [1], and some potential applications have been explored, including negative index of refraction [2][3][4][5], perfect lenses which can break the usual wavelength limits with double negative index materials [6], EM concentrators [7], subwavelength waveguides [8,9], electromagnetic wave rotators [10], and cloaking devices [11][12][13][14][15][16][17], etc. Limits that were considered insurmountable in conventional setups have indeed been shown to be, at least potentially, surpassed when the special materials are employed [18].…”

“…Ziolkowski discussed the propagation and scattering of microwave in cylinder and sphere shape mu and epsilon-near-zero metamaterials with the FDTD method [19]. Since Enoch et al proposed the scheme of directive emission by embedding a source in an ENZ metamaterial slab in 2002 [20], several attempts have been presented with analogous purposes [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27]. Recently, high directive emissions [28,29] and multi-beams [30,31] have been achieved with the transformation optics technique, which provides a great opportunity for designing novel electromagnetic and optical devices.…”