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Updated: Jan 30, 2026

Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
Published on: July 21, 2018
Geometrical Dependence on the Onset of Surface Plasmon Polaritons in THz Grid Metasurfaces
Gian Paolo Papari1,2, Can Koral3, Antonello Andreone4,5
1Department of Physics, University of Naples "Federico II", and CNR-SPIN, I-80125, Naples, Italy. papari@fisica.unina.it.
Abstract:
The transmission response of metallo-dielectric grid metasurfaces is experimentally investigated through Terahertz Time Domain Spectroscopy and the corresponding effective dielectric function is retrieved. Using a lumped element model we can determine the dependence of the effective plasma frequency (the transition frequency) on the metasurface filling factor F. The change of the transition frequency vs. F spans over one order of magnitude and sets the threshold between the metamaterial (homogeneous) and the photonic crystal (diffraction-like) regime, ruling the onset of two different Surface Plasmon Polaritons, spoof and high order. Field symmetry and spatial extension of such excitations are investigated for the possible applications of THz grid metasurfaces in bio- and chemical sensing and sub-wavelength imaging.
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