Experimental observation of sub-radiant longitudinal mode and anomalous optical transmission in metallic wire meshes

In conventional plasmonic media and metamaterials, such as metallic wire meshes, a longitudinal mode of an electromagnetic wave manifests itself in frequency overlapping transverse modes, which impedes clear observation longitudinal-mode-specific physical effects. Through interlacing two sets ideal band for the is achieved ranging from zero to plasma frequency, where modes are completely forbidden. The unique spectral separation facilitates pure related effects bulk medium. We report microwave experiment anomalous optical transmission, induced solely by resonance, below mesh