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

Experimental observation of anomalous optical transmission in interlaced metallic wire meshes