Negative refraction based on purely imaginary conjugate metamaterials
نویسندگان
چکیده
By introducing a new mechanism based on purely imaginary conjugate metamaterials (PICMs), we reveal that bidirectional negative refraction and planar focusing can be obtained using a pair of PICMs, which is a breakthrough to the unidirectional limit in parity time (PT) symmetric systems. Compared with PT symmetric systems that require two different kinds of materials, the proposed negative refraction can be realized with only two identical media. In addition, asymmetric excitation with bidirectional total transmission is observed in our PICM system. Therefore, a new way to realize negative refraction is presented, with more properties than those in PT symmetric systems.
منابع مشابه
An Extremal Problem Related to Negative Refraction Kristian Seip and Johannes Skaar
We solve an extremal problem that arises in the study of the refractive indices of passive metamaterials. The problem concerns Hermitian functions in H of the upper half-plane, i.e., H functions satisfying f(−x) = f(x). An additional requirement is that the imaginary part of f be nonnegative for nonnegative arguments. We parameterize the class of such functions whose real part is constant on an...
متن کاملA Systematic Approach to Photonic Crystal Based Metamaterial Design
Photonic crystal design procedure for negative refraction has so far been based on trial and error. In this paper, for the first time, a novel and systematic design procedure based on physical and mathematical properties of photonic crystals is proposed to design crystal equi-frequency contours (EFCs) to produce negative refraction. The EFC design is performed by the help of rectangular stair-c...
متن کاملNegative and near zero refraction metamaterials based on permanent magnetic ferrites
Ferrite metamaterials based on the negative permeability of ferromagnetic resonance in ferrites are of great interest. However, such metamaterials face a limitation that the ferromagnetic resonance can only take place while an external magnetic field applied. Here, we demonstrate a metamaterial based on permanent magnetic ferrite which exhibits not only negative refraction but also near zero re...
متن کاملOptical negative-index bulk metamaterials consisting of 2D perforated metal-dielectric stacks.
Numerical simulations of a near-infrared negative-index metamaterial (NIM) slab consisting of multiple layers of perforated metal-dielectric stacks exhibiting a small imaginary part of the index over the wavelength range for negative refraction are presented. A consistent effective index is obtained using both scattering matrix and modal analysis approaches. Backward phase propagation is verifi...
متن کاملNegative refraction, negative phase velocity, and counterposition in bianisotropic metamaterials with chirality
The planewave response of bianisotropic materials generally cannot be characterized by a single scalar index, as directionality of energy flow and multiple wavevectors need to be considered. This is especially significant for bianisotropic metamaterials which support negative refraction, negative phase velocity, and counterposition. By means of a numerical example based on a commonly–studied bi...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2017