Abstract
Anisotropic ɛ-near-zero effective medium multilayer structures for omnidirectional bending light to the normal are theoretically studied. A finite element method is presented, using a unit cell with Floquet port master and slave boundaries, for examining metal–dielectric multilayer structures to form the permittivity tensor. Ellipsometry measurements of CdO films are reported, and it is found that film thicknesses of ∼50 nm are adequate for the metallic layer. Omnidirectional bending to the normal is verified for multilayer structures, and this method is shown to simplify the computations over using a typical full space approach.
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