Infrared and optical invisibility cloak with plasmonic implants based on scattering cancellation

Abstract

Engheta, "Infrared and optical invisibility cloak with plasmonic implants based on scattering cancellation", . August 2008. Infrared and optical invisibility cloak with plasmonic implants based on scattering cancellation AbstractIn recent works, we have suggested that plasmonic covers may provide an interesting cloaking effect, dramatically reducing the overall visibility and scattering of a given object. While materials with the required properties may be directly available in nature at some specific infrared or optical frequencies, this is not necessarily the case for any given design frequency of interest. Here we discuss how such plasmonic covers may be specifically designed as metamaterials at terahertz, infrared, and optical frequencies using naturally available metals. Using full-wave simulations, we demonstrate that the response of a cover formed by metallic plasmonic implants may be tailored at will so that at a given frequency, it possesses the plasmonic-type properties required for cloaking applications. In recent works, we have suggested that plasmonic covers may provide an interesting cloaking effect, dramatically reducing the overall visibility and scattering of a given object. While materials with the required properties may be directly available in nature at some specific infrared or optical frequencies, this is not necessarily the case for any given design frequency of interest. Here we discuss how such plasmonic covers may be specifically designed as metamaterials at terahertz, infrared, and optical frequencies using naturally available metals. Using full-wave simulations, we demonstrate that the response of a cover formed by metallic plasmonic implants may be tailored at will so that at a given frequency, it possesses the plasmonic-type properties required for cloaking applications.

CLOAKING AND INVISIBILITY: A REVIEW (Invited Review)

“…Plasmonic cloaking implements the scattering cancellation technique using cloaks or shells made out of homogeneous and isotropic materials [140][141][142][143][144][145][146][147][148][149][150][151][152][153][154][155]. The term 'plasmonic cloaking' stems from the fact that in general, to cloak most objects, a cloak with permittivity below unity is ideal, which requires the use of materials with plasma-like dispersion, called plasmonic materials.…”

“…When natural materials are not available, the method needs to be implemented with metamaterials. For instance, plasmonic covers can be realized with parallel plate metamaterials in the 2D cylindrical case [152,153], for one polarization. Fig.…”

Employment of metamaterial cloaks to enhance the resolution of near-field scanning optical microscopy systems based on aperture tips

“…In order to effectively make the object invisible, the coating material should exhibit a negative or low-positive real permittivity at the design frequency [4][5][6]. If the object to hide is electrically small, scattering cancellation results in the compensation of the electric dipole moments, which can be easily obtained by adjusting the volumes of the object and the cover [4,5].…”

“…The recent advances in metamaterial research led to conceive conceptually new devices, the so-called invisibility cloaks, which are able to strongly reduce the scattering and the electromagnetic perturbation due to an object [4][5][6][7][8][9][10]. Though invisibility concepts typically evoke military applications, cloaking has been proved to be extremely useful also in several civil scenarios.…”

Plasmonic and non‐plasmonic layered structures for cloaking applications at visible frequencies

“…Recently, a few approaches have been proposed [8,10] employing proper metallic plates implanted in a host material. Such approaches present, anyway, fabrication issues, due to their rather complex geometries.…”