Meta-materials (Thai)

Abstract

      Meta-materials or artificial electromagnetic materials are composed of periodic arrays of resonant structures that can be realized as a bulk medium when the structure period and the largest dimensions of the inclusions are much smaller than the wavelength. When the period is an appreciable amount of the wavelength, constructive and destructive interferences occur leading to electromagnetic bandgap behavior. In both cases, the effective permittivity and permeability can be tuned to values not easily achievable in natural materials. Meta-materials hold significant promise for the future, ranging from applications in sub-wavelength resonators to super-directive antennas such as in optical nanolithography, nano circuits and meta-coating, including also the famous cloaking phenomenon which can make objects invisible.

      This paper provides an introduction to meta-materials describing the principle: history, basic synthesis and modeling techniques, types and their special physical and electromagnetic properties. Applications of these çbeyondé materials and the potential of meta-materials in this century are also discussed