Dependence of the coupling properties between a plasmonic antenna array and a sub-wavelength epsilon-near-zero film on structural and material parameters

The resonance properties of a plasmonic dipole antenna array depend on its geometry and the surrounding medium. linear optical an antennas can be modified with inclusion epsilon-near-zero (ENZ) thin film. In this work, we numerically investigate roles dimensions, ENZ film thickness loss, separation between in determining response antenna–ENZ metasurface. results show that for sufficiently small separation, are determined by strong or ultrastrong coupling only weakly dependent geometry. We metasurfaces thick, lossy films, lower polariton branch is not observable due to high loss films. Since dependence upper length weak, single antenna-length-invariant resonance. However, presence low-loss also visible thicker indicating For given geometry, strength increases increasing reach up ∼50% zero-permittivity frequency film,