Abstract
We consider cloaking by a coated cylindrical system using plasmonic resonance, and extend previous quasistatic treatments to include the effect of finite wavelength. We show that a probe cylinder can still be cloaked at finite wavelengths, but the cloaking cylinder develops a nonzero scattering cross section. We show that this latter effect is dominated by a monopole term in the case of an ideal (lossless) cloaking material, and by a dipole term in the case of a realistic (lossy) material. It can be reduced but not eliminated by variations of geometric or dielectric parameters of the cloaking cylinder.
Highlights
There is much current interest in the possibility of cloaking or hiding objects from scrutiny by electromagnetic waves
We have presented numerical results displaying clearly the tendency for it to be more difficult to hide the larger cloaking system than the smaller object it is trying to conceal from electromagnetic probing, and we have analyzed this effect to quantify to what extent it can be overcome
These size limits just require both the cloaking system and the system it is cloaking to be in the quasistatic regime
Summary
There is much current interest in the possibility of cloaking or hiding objects from scrutiny by electromagnetic waves. Cloaking by refraction requires a structured metamaterial shell to divert light around a cavity in which the object to be hidden is placed (internal cloaking) It is designed using a full solution of Maxwell equations in two or three dimensions, and there has been an experimental demonstration of this mechanism in the former case [11]. This is in keeping with the results of Hao-Yuan She et al [14] but not with those reported by Min Yan et al [15]
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