Double and Single Negative Media for Evanescent Field Detection

Evanescent field calculations for multilayered structures are presented with the capability of handling single negative (SNG) and double negative (DNG) metamaterial layers. A sensitivity definition is made for evanescent field probes and the effects of using SNG and DNG metamaterial slabs are analyzed. It is found that SNG and DNG metamaterials increase the sensitivity of detection for a buried target. This finding leads to a new paradigm in designing nearfield based probes using SNG and DNG media.

Keywords:

Evanescent field theory , Evanescentfield imaging , Metamaterials , Subwavelength resolution