The magnetic field Hz distribution in the near-field region of the metallic structure at the wavelengths corresponding to lower ( lambda = 564 nm) branches of the surface plasmon polarition (SPP) Bloch modes around the second band-gap in a weak-coupling regime. Authors analyze the Bloch mode spectrum of SPPs on a finite thickness metal film in the regimes of weak and strong coupling between SPP modes on the opposite film interfaces. [See article by Gerard et al. Fig. 5(a) for details.]
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