Abstract
A metal plate array (MPA) which is a structure complimentary to a metal hole array (MHA), supports spoof surface plasmon polaritons (SSPP) as well as an MHA does. Babinet’s principle attributes the phenomenon of duality to transmission characteristics of the complimentary impedance surfaces because of the symmetry of the behaviors of electric and magnetic fields. However, it is also a fact that the complimentary structures do not follow this principle if they have wavelength-size thickness, because electromagnetic waves do not treat such thick structures as a boundary surface but as propagation spaces with the specific boundaries such as a waveguide which shows SSPP modes. If the thickness is so small that it is negligible, Babinet’s principle is still valid, while it has been uncertain how the layer thickness works to break the principle as it is increased. The unconfirmed transformation is revealed analytically and experimentally with the use of MPAs and MHAs of varying thicknesses.
Highlights
A metal plate array (MPA) which is a structure complimentary to a metal hole array (MHA), supports spoof surface plasmon polaritons (SSPP) as well as an MHA does
In Section "Basis of spoof surface plasmon polaritons generations on a metal plate array", SSPP mode generation on an MPA is discussed by introducing a theoretical wave propagation model, and the effective relative permittivity and the dispersion relation are derived
SSPP mode formation on an MPA was introduced by theoretically deriving the effective relative permittivity with a Drude-type frequency response and the SSPP dispersion relation on an MPA following Pendry’s theory of SSPPs in the case of an MHA
Summary
A metal plate array (MPA) which is a structure complimentary to a metal hole array (MHA), supports spoof surface plasmon polaritons (SSPP) as well as an MHA does. In Section "Basis of spoof surface plasmon polaritons generations on a metal plate array", SSPP mode generation on an MPA is discussed by introducing a theoretical wave propagation model, and the effective relative permittivity and the dispersion relation are derived.
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