We investigate the problem of designing metamaterial structures which operate at very low frequencies. As an example, we consider the case of a DC magnetic cloak, which requires a variable, anisotropic magnetic permeability with both paramagnetic and diamagnetic components. We show that a structure based on superconducting components is the key to diamagnetism at low frequencies, and present a ...

Here, we theoretically suggest the possibility of employing a multilayered plasmonic shell as a cloak for reducing the total scattering cross section of a particle, simultaneously at different frequencies in the optical domain. By exploiting the frequency dispersion of plasmonic materials and their inherent negative polarizability, it is shown, theoretically and with numerical simulations, how ...

In this paper we investigate the possibility of elastodynamic transformation cloaking in bodies made non-centrosymmetric gradient solids. The goal is to hide a hole from elastic disturbances sense that mechanical response homogeneous and isotropic body with covered by cloak would be identical corresponding outside cloak. It known case centrosymmetric solids balance angular momentum obstruction ...

Transformation optics has led the way in the development of electromagnetic invisibility cloaks from science fiction to engineering practice. Invisibility cloaks have been demonstrated over a wide range of the electromagnetic spectrum, and with a variety of different fabrication techniques. However, all previous schemes have relied on the use of metamaterials consisting of arrays of sub-wavelen...

We studied the practical limitations of a linearly transformed invisibility cloak due to the loss and discretization. We found that in order for the cloaking applications to be practically useful, for example, to reduce the scattering by two orders, the maximum loss tangent allowed in the cloak needs to be of or within the order of 0.01, which also limits the radius of a concealed object to be ...

This paper examines major privacy concerns in location-based services. Most user privacy techniques are based on cloaking, which achieves location k-anonymity. The key is to reduce location resolution by ensuring that each cloaking area reported to a service provider contains at least k mobile users. However, maintaining location k-anonymity alone is inadequate when the majority of the k mobile...

A new strategy to control the flow of surface plasmon polaritons at metallic surfaces is presented. It is based on the application of the concept of transformation optics to devise the optical parameters of the dielectric medium placed on top of the metal surface. We describe the general methodology for the design of transformation optical devices for surface plasmons and analyze, for proof-of-...

Underwater acoustic stealth has great scientific research value. According to coordinate transformation theory, the cloak based on pentamode materials can realize underwater broadband stealth. However, due correlation between density and modulus of changes in parameters each layer cloak, a large amount structural optimization work is required for material meet specific parameter requirements, w...

A nyone who’s read the Harry Potter books by J.K. Rowling understands the concept of an invisibility cloak. Furthermore, humans have dreamt of what invisibility might mean since the beginning of civilization, and this dream persists in today’s literature and culture. However, although more improbable methods of invisibility will remain unrealized, an invisibility cloak could be feasible in the ...

The invisibility cloak has been a long-standing dream for many researchers over the decades. Using transformation optics, a three-dimensional (3D) object is perceived as having a reduced number of dimensions, making it "undetectable" judging from the scattered field12345. Despite successful experimental demonstration at microwave and optical frequencies6789101112, the spectroscopically importan...