Technique for reducing surface wave at an air/left-handed medium (LHM) interface or excitation of the forward wave in an LHM
نویسندگان
چکیده
In this paper, we analyze the illumination by an electromagnetic wave of an air/left-handed medium (LHM) interface. It is shown that by placing a periodic structure of resistors near the LHM it is possible to suppress or to reduce the surface wave that is present at the interface. For our demonstration, we consider a semi-infinite lossless lefthanded medium having the same constitutive parameters as those of air but with opposite signs. Numerical results, obtained by using a full-wave time domain technique, are presented to validate our approach and the proposed scheme. This work can extend the potential applications of left-handed materials, because it shows that it is possible to use LHM slabs having large width. In addition, this work shows that it is possible to excite the forward wave of an LHM instead of the backward wave.
منابع مشابه
Electromagnetic equivalent model for phase conjugate mirror based on the utilization of left-handed material.
An electromagnetic equivalent model for the phase conjugate mirror (PCM) is proposed in this paper. The model is based on the unique property of the isotropic left-handed material (LHM) - the ability of LHM to reverse the phase factors of propagative waves. We show that a PCM interface can be substituted with a LHM-RHM (right-handed material) interface and associated image sources and objects i...
متن کاملOptical Limits in Left-Handed Media
This thesis determines the response of Left-Handed Media (LHM) to surface effects. A LHM half-space with a roughened interface, modelled by a graded index boundary, is shown to give rise to an analytical solution for the propagation of electromagnetic radiation through this inhomogeneous layer. Significant field localization is generated within the layer, caused by the coherent superposition of...
متن کاملPhotonic Approach to Making a Left-Handed Material
A new approach to producing a composite material with negative refraction index is demonstrated. It is shown that a photonic structure which consists of two dielectric materials, with positive and negative dielectric permittivities, can support electromagnetic waves which exhibit the unusual electromagnetic property of left-handedness (or negative refraction index). These electromagnetic waves ...
متن کاملNovel Electromagnetic Radiation in Left - Handed Materials
In this thesis, Cerenkov radiation of a moving charged particle inside a Left-Handed material (LHM) is studied through both theory and numerical simulations. A LHM is a material whose permittivity and permeability have negative real parts. In the analysis of this thesis, the general theory of Cerenkov radiation was first studied for the unbounded regions filled with LHM. The physical meanings o...
متن کاملSome Reflections on Double Negative Materials
We study the energy conservation property and loss condition of a left-handed material (LHM). First we argue by energy conservation that an LHM has to be a backward-wave material (BWM). Then we derive the equivalence of the loss and the Sommerfeld far-field radiation conditions for BWM. Next, we solve the realistic Sommerfeld problem of a point source over an LHM half space and an LHM slab. Wit...
متن کامل