Sub-wavelength near field imaging using a cross polarised slot with wire insert

Abstract

In this paper we study sub-wavelength imaging by a new type of probe comprising a single cross polarized slot cut into a metal plate which has a wire inserted along its length. Using this arrangement we show by numerical simulation and experimentally that the transmitted near field can be enhanced up to 25dB with respect to the unloaded slot transmission. Moreover, superior near field squeezing results in 0.14 λ FWHM at 0.1λ distance from the slot. The arrangement yields image resolution capability of better than λ/4 at distance between 0.1λ and 0.2λ from the slot.