Space wave channeling enabled by conformal transformation optics

摘要

Transformation optics (TO) methodology provides an unconventional approach to mold the path of electromagnetic (EM) waves. Most of the previous works reported today are limited to control EM waves in either reflection or transmission mode. However, by merging TO and geometrical optics, we present a concept of space wave channeling metamaterial (SWCM) to manipulate backward and forward scattered waves simultaneously. As proof-of-principle, backward anomalous scattering, forward anomalous scattering, and multibeam arbitrary scattering patterns are realized through only one inhomogeneous isotropic dielectric medium with proper arrangement of embedded perfect electric conductor (PEC) pieces. Numerical full-wave simulations are performed to verify the potential realization of SWCM with all-dielectric gradient refractive index metamaterials. The proposed designing approach paves the way to the development of EM wave manipulations with feasible constitutive materials. (C) 2019 Optical Society of America