Abstract
In this letter, we experimentally investigated the transmission of microwaves through a single subwavelength slit surrounded by periodic grooves in metallic aluminum plates. Significant transmission enhancement (16.2-fold) and angular confinement (±18°) were observed at X-band microwave frequencies (8–12GHz). We demonstrated that the coupled surface plasmons were involved in the interesting transmission process. The little angular divergence was attributed to the periodic structures of the exit surface. The experimental results show good agreement with theory and are of relevance not only for further understanding the underlying science but also for enlarging applications based on this phenomenon.
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