Three Dimensional Electromagnetic Concentrators With Homogeneous Material Parameters

Abstract

Abstract-By means of a three-step linear optical transformation method, material parameters of a three-dimensional diamond-shaped electromagnetic concentrator composed of tetrahedral homogeneous blocks has been derived in this paper. The performance of the concentrator has been confirmed by full-wave simulation. The designed concentrator can operate in a wide bandwidth due to the line transformation. It represents an important progress towards the practical realization of the metamaterial-assisted concentrator.

Inverse design based metamaterial concentrator and its applications and realization

“…Among various novel devices, metamaterial concentrator as an important wave-manipulation device has recently received considerable attention. Since the cylindrical concentrator was first proposed by Rahm et al [16], many further investigations on the concentrator have been conducted, including non-rotationally invariant concentrator [17], cone-shaped concentrator [18], arbitrary shaped concentrators [19], homogeneous-materials-constructed concentrator [20,21], concentrator with only axial parameter spatially variant [22], and concentrator with minimized scattering [23]. Moreover, the scope of the research has been gradually extended from optics to acoustics [24], plasmonics [25], elastodynamics [26] and even thermodynamics [27].…”

Cylindrical to rectangular coordinate transformation for planar phase front synthesis

“…This technique, which relies on the form-invariance of Maxwell's equations through a spatial coordinate transformation, provides a methodology to manipulate electromagnetic waves by engineering non-homogeneous anisotropic constitutive parameters, namely the permittivity and the permeability [1][2][3][4] based on a transformation scheme. Novel applications of transformation electromagnetics also known as transformation optics include various devices such as the invisibility cloak [5], the electromagnetic concentrator [6,7], illusion device [8], super absorber [9] and super scatter [10].…”

Equivalent Realization of Cylindrical Electromagnetic Concentrator Based On Transmission Line Network

“…As an emerging research field, transformation optics (TO) has recently created a great sensation in the scientific community since it provide us with unprecedented freedom to design novel wave-manipulation devices that seemed unconceivable a decade ago [1][2][3][4][5], such as invisible cloaks, perfect lenses, and electromagnetic concentrators. Among these astonishing devices, concentrators capable of focusing electromagnetic wave into a core region to get high energy density have aroused lots of interest due to its broad application prospects in designing efficient receiving antenna, solar cell or similar devices [6][7][8][9][10][11][12]. The first electromagnetic concentrator with cylindrical shape is proposed by Rahm et al [6], and then intensive studies on the concentrator have been conducted, including coneshaped concentrators [7], arbitrary-shaped concentrators [8], non-rotationally invariant concentrators [9], homogeneousmaterials-constructed concentrators [10], concentrators with only axial parameter spatially variant [11], and concentrators with minimized scattering [12].…”

“…Among these astonishing devices, concentrators capable of focusing electromagnetic wave into a core region to get high energy density have aroused lots of interest due to its broad application prospects in designing efficient receiving antenna, solar cell or similar devices [6][7][8][9][10][11][12]. The first electromagnetic concentrator with cylindrical shape is proposed by Rahm et al [6], and then intensive studies on the concentrator have been conducted, including coneshaped concentrators [7], arbitrary-shaped concentrators [8], non-rotationally invariant concentrators [9], homogeneousmaterials-constructed concentrators [10], concentrators with only axial parameter spatially variant [11], and concentrators with minimized scattering [12]. The foregoing investigations are really attractive, but the material parameters of aforesaid concentrators are usually anisotropic and/or inhomogeneous.…”