EM superradiation in cylindrical geometries

Poor isotropic electromagnetic (EM) emitters are found to substantially enhance their radiative power when located internally to cylindrical boundaries involving plasmonic shells or tubular metasurfaces. In the optimal designs, the placement of the antenna tailors the interference between multiple in-going and out-going modes to give strong omnidirectional or bipolar patterns, different for each wave polarization. The reported superradiating setups carry over the concept of photonic superradiance to classical electromagnetics by utilizing the developed source images for achieving powerful emissive responses. The proposed configurations can be employed as ultra-efficient components in optical applications, spanning from array design and far-field wireless power transfer to radiative biosensing and polarization-enabled analog signal processing.