Optical Cloaking with Non-Magnetic Metamaterials

Optical Cloaking with Non-Magnetic Metamaterials

| Wenshan Cai, Uday K. Chettiar, Alexander V. Kildishev and Vladimir M. Shalaev
This paper presents a design for a non-magnetic optical cloak operating at optical frequencies. The cloak is based on coordinate transformation, which compresses a cylindrical region into a concentric cylindrical shell. The design focuses on TM illumination with the magnetic field polarized along the z-axis, simplifying the requirements for the anisotropic permittivity and permeability in the cloaking shell. The key challenge is to achieve a smooth variation of the radial permittivity from 0 at the inner boundary to 1 at the outer boundary. This is achieved using metal wires of subwavelength size embedded in a dielectric material, with the aspect ratio of the wires determined by the desired effective permittivity. The design is validated through full-wave finite-element simulations, showing that the proposed cloak can effectively reduce scattering around a hidden object, demonstrating the potential for realizing optical invisibility.This paper presents a design for a non-magnetic optical cloak operating at optical frequencies. The cloak is based on coordinate transformation, which compresses a cylindrical region into a concentric cylindrical shell. The design focuses on TM illumination with the magnetic field polarized along the z-axis, simplifying the requirements for the anisotropic permittivity and permeability in the cloaking shell. The key challenge is to achieve a smooth variation of the radial permittivity from 0 at the inner boundary to 1 at the outer boundary. This is achieved using metal wires of subwavelength size embedded in a dielectric material, with the aspect ratio of the wires determined by the desired effective permittivity. The design is validated through full-wave finite-element simulations, showing that the proposed cloak can effectively reduce scattering around a hidden object, demonstrating the potential for realizing optical invisibility.
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