Tweet
Basically they are saying that alternating layers of nano-thickness materials could be used to create an invisibility cloak that works at optical wavelengths.
Paper link (PDF)....
Paper link (PDF)....
Electromagnetic cloaking by layered structure of homogeneous isotropic materials
Ying Huang, Yijun Feng, Tian Jiang
Department of Electronic Science and Engineering, Nanjing University, Nanjing, 210093, China
Abstract:
Electromagnetic invisibility cloak requires material with anisotropic distribution of the constitutive parameters deduced from a geometrical transformation as first proposed by Pendry et al. [Science 312, 1780 (2006)]. In this paper, we proposed a useful method to realize the required radius-dependent, anisotropic material parameters and to construct an electromagnetic cloak through concentric layered structure of thin, alternating layers of homogeneous isotropic materials. With proper design of the permittivity or the thickness ratio of the alternating layers, we demonstrated the low-reflection and power-flow bending properties of the proposed cloaking structure through rigorous analysis of the scattered electromagnetic fields. The proposed cloaking structure does not require anisotropy or inhomogeneity of the material constitutive parameters usually realized by metamaterials with subwavelength structured inclusions, therefore may lead to a practical path to an experimental demonstration of electromagnetic cloaking, especially in the optical range.
>
>
Conclusions:
We have proposed an electromagnetic wave cloak by realizing the radius-dependent, anisotropic material through layered structures of homogeneous isotropic materials. The performance of the cylindrical cloak has been demonstrated through rigorous calculation of the electromagnetic wave scattering, which reveals the low-scattering and power-flow bending nature of the properly designed cloaking structure. Our proposal has no requirement of any anisotropy or inhomogeneity of the material constitutive parameters, therefore may lead to a simpler path to an experimental demonstration of electromagnetic cloaking, especially in the optical range.
Ying Huang, Yijun Feng, Tian Jiang
Department of Electronic Science and Engineering, Nanjing University, Nanjing, 210093, China
Abstract:
Electromagnetic invisibility cloak requires material with anisotropic distribution of the constitutive parameters deduced from a geometrical transformation as first proposed by Pendry et al. [Science 312, 1780 (2006)]. In this paper, we proposed a useful method to realize the required radius-dependent, anisotropic material parameters and to construct an electromagnetic cloak through concentric layered structure of thin, alternating layers of homogeneous isotropic materials. With proper design of the permittivity or the thickness ratio of the alternating layers, we demonstrated the low-reflection and power-flow bending properties of the proposed cloaking structure through rigorous analysis of the scattered electromagnetic fields. The proposed cloaking structure does not require anisotropy or inhomogeneity of the material constitutive parameters usually realized by metamaterials with subwavelength structured inclusions, therefore may lead to a practical path to an experimental demonstration of electromagnetic cloaking, especially in the optical range.
>
>
Conclusions:
We have proposed an electromagnetic wave cloak by realizing the radius-dependent, anisotropic material through layered structures of homogeneous isotropic materials. The performance of the cylindrical cloak has been demonstrated through rigorous calculation of the electromagnetic wave scattering, which reveals the low-scattering and power-flow bending nature of the properly designed cloaking structure. Our proposal has no requirement of any anisotropy or inhomogeneity of the material constitutive parameters, therefore may lead to a simpler path to an experimental demonstration of electromagnetic cloaking, especially in the optical range.