An analytical theory is developed for parametric interactions in metamaterial multilayer structures with simultaneous nonlinear electronic and magnetic responses and with a near-zero refractive index. We demonstrate theoretically that electromagnetic fields of certain frequencies can be parametrically shielded by a nonlinear left-handed material slab, where the permittivity and permeability are...

We report a general method to design unique type of non-Hermitian electromagnetic double-near-zero index medium by two-dimensional photonic crystal. The synergy nonsymmorphic glide symmetry the lattice, period-doubling unit cell, and perturbation crystal induces phase transition in eigenvalue spectrum. Near Brillouin zone center, such is effectively an anisotropic medium. Along direction intere...

A double-layer nanostructure comprising amorphous Si nanograss on top of Si nanofrustums (NFs) with a total height of 680 nm exhibits ultralow reflection. Almost near-unity absorption and near-zero reflectance result in this layered nanostructure, over a broad range of wavelengths and a wide range of angles of incidence, due to the low packing density of a-Si and the smooth transition of the re...

In the standard M-line method for the characterization of graded-index film, an analytical curve is fitted to the waveguide mode measurements and extrapolated to provide the refractive index in the zero-depth limit. Here we review our polarimetric approach to a direct near-surface measurement, which complements the M-line method. Also, we present its new and more straightforward version, which ...

Zero index materials where sound propagates without phase variation, holds a great potential for wavefront and dispersion engineering. Recently explored electromagnetic double zero index metamaterials consist of periodic scatterers whose refractive index is significantly larger than that of the surrounding medium. This requirement is fundamentally challenging for airborne acoustics because the ...

ABSTRACT. A novel and accurate refractive index profile synthesis method for optical fibres is developed using knowledge of the fundamental or higher order mode near field. This fundamental method is based on inverse transmission line principles. From Maxwell’s equations, we derive a transmission line equivalent circuit for a circularly symmetric optical fibre with arbitrary refractive index. W...

Zero-order ray paths are examined in radially inhomogeneous spheres with differentiable refractive index profiles. It is demonstrated that zero-order and sometimes twin zero-order bows can exist when the gradient of refractive index is sufficiently negative. Abel inversion is used to "recover" the refractive index profiles; it is therefore possible in principle to specify the nature and type of...