title: Nearly perfect Fano transmission resonances through nanoslits drilled in a metallic membrane.
abstract: We report nearly perfect optical transmission (87%) through freestanding metallic gratings with narrow slits, as the experimental demonstration of the theoretical prediction by Porto et al. [Phys. Rev. Lett. 83, 2845 (1999)10.1103/PhysRevLett.83.2845]. In addition, we show that the Fano line shape of transmission spectra reveals the interplay between localized and propagating surface plasmon resonances, and allows us to determine the nonradiative losses. It provides the limits for the transmission efficiency and resonance quality factor. As an illustration, a mosaic of various bandpass filters has been achieved in a single membrane.
authors.affiliation: Laboratoire de Photonique et de Nanostructures (LPN-CNRS), Route de Nozay, 91460 Marcoussis, France. Stephane.Collin@lpn.cnrs.fr
authors.forename: Stéphane
authors.initials: S
authors.lastname: Collin
authors.forename: Grégory
authors.initials: G
authors.lastname: Vincent
authors.forename: Riad
authors.initials: R
authors.lastname: Haïdar
authors.forename: Nathalie
authors.initials: N
authors.lastname: Bardou
authors.forename: Sylvain
authors.initials: S
authors.lastname: Rommeluère
authors.forename: Jean-Luc
authors.initials: JL
authors.lastname: Pelouard