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.

Geometrical Dependence on the Onset of Surface Plasmon Polaritons in THz Grid Metasurfaces / Papari, G. P.; Koral, C.; Andreone, A.. - In: SCIENTIFIC REPORTS. - ISSN 2045-2322. - 9:1(2019), p. 924. [10.1038/s41598-018-36648-x]

Geometrical Dependence on the Onset of Surface Plasmon Polaritons in THz Grid Metasurfaces

Papari G. P.;Koral C.;Andreone A.
2019

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.
2019
Geometrical Dependence on the Onset of Surface Plasmon Polaritons in THz Grid Metasurfaces / Papari, G. P.; Koral, C.; Andreone, A.. - In: SCIENTIFIC REPORTS. - ISSN 2045-2322. - 9:1(2019), p. 924. [10.1038/s41598-018-36648-x]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/760808
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