Tunable Scattering Cancellation of Light Using Anisotropic Cylindrical Cavities

Abstract

Engineered core-shell cylinders are good candidates for applications in invisibility and cloaking. In particular, hyperbolic nanotubes demonstrate tunable ultra-low scattering cross section in the visible spectral range. In this work we investigate the limits of validity of the condition for invisibility, which was shown to rely on reaching an epsilon near zero in one of the components of the effective permittivity tensor of the anisotropic metamaterial cavity. For incident light polarized perpendicularly to the scatterer axis, critical deviations are found in low-birefringent arrangements and also with high-index cores. We demonstrate that the ability of anisotropic metallodielectric nanocavities to dramatically reduce the scattered light is associated with a multiple Fanoresonance phenomenon. We extensively explore such resonant effect to identify tunable windows of invisibility.

Accurate expansion of cylindrical paraxial waves for its straightforward implementation in electromagnetic scattering

“…Finally, this procedure can be applied to any kind of two-dimensional paraxial beam, in particular when it will interact with particles set in its trajectory. Such scatterers are not restricted in size, ranging from nanowires to large cylinders, which in addition can be made of anisotropic and even multilayered materials [27,28].…”

Tunable GRIN lensing based on graphene-dielectric multilayer metamaterials

“…Non-periodic metamaterials firstly presented in [4] based on conducting split-ring resonators, which provide an effective medium with a constant spatial gradient index of refraction. GRIN metamaterials have considerably more freedom to manipulate electromagnetic waves, and many novel applications and optimized performances such as reconfigurable and high-resolution lenses [5][6][7][8], photonic jets [9][10][11], the high-performance antenna [12], invisibility cloaks [13], couplers and interconnectors [14,15], steerers [16,17] are reported based on them. However, GRIN metamaterials can be realized in different ways which are reviewed in [18].…”