Design and rigorous analysis of transformation-optics scaling devices

Abstract

Scaling devices that can shrink or enlarge an object are designed using transformation optics. The electromagnetic scattering properties of such scaling devices with anisotropic parameters are rigorously analyzed using the eigenmode expansion method. If the radius of the virtual object is smaller than that of the real object, it is a shrinking device with positive material parameters; if the radius of the virtual object is larger than the real one, it is an enlarging device with positive or negative material parameters. Hence, a scaling device can make a dielectric or metallic object look smaller or larger. The rigorous analysis shows that the scattering coefficients of the scaling devices are the same as those of the equivalent virtual objects. When the radius of the virtual object approaches zero, the scaling device will be an invisibility cloak. In such a case, the scattering effect of the scaling device will be sensitive to material parameters of the device.

Nonpolarm-plane GaN/AlGaN heterostructures with intersubband transitions in the 5–10 THz band

“…Specially, the scattering of subwavelength structures can be enhanced to realize superscatterers, which can magnify the scattering cross section of a given object remarkably [8]. Due to their potential applications in detection, spectroscopy, and photovoltaics [10][11][12][13][14][15][16], various superscatterers with different shapes and types have been designed [17][18][19][20][21][22][23][24][25][26][27][28][29][30], and the concept of superscatterer has been extended to acoustics [31,32].…”

Design of Ultracompact Graphene-Based Superscatterers

“…This concept was first proposed based on the transformation optics approach, where the scattering cross section of a cylindrical perfect electric conductor (PEC) is enhanced by an anisotropic and inhomogeneous electromagnetic cover [1], [2], [3], [4], [5], [6], [7], [8]. Alternatively, for subwavelength objects, a superscatterer can be designed by the metal-dielectric layers, where the scattering cross section is magnified due to the enhancement of the localized surface plasmons [9], [10].…”

Design of Ultra-compact Graphene-based Superscatterers

“…S UPERSCATTERER is a device that can magnify the scattering cross section of a given object remarkably [1], [2]. This concept was first proposed based on the transformation optics approach, where the scattering cross section of a cylindrical perfect electric conductor (PEC) is enhanced by an anisotropic and inhomogeneous electromagnetic cover [1], [2], [3], [4], [5], [6], [7], [8]. Alternatively, for subwavelength objects, a superscatterer can be designed by the metal-dielectric layers, where the scattering cross section is magnified due to the enhancement of the localized surface plasmons [9], [10].…”