title: Resonant optical transmission through thin metallic films with and without holes.
abstract: Using a rigorous electromagnetic analysis of two-dimensional (or crossed) gratings, we account, in a first step, for the enhanced transmission of a sub-wavelength hole array pierced inside a metallic film, when plasmons are simultaneously excited at both interfaces of the film. Replacing the hole array by a continuous metallic film, we then show that resonant extraordinary transmission can still occur, provided the film is modulated. The modulation may be produced in both a one-dimensional and a two dimensional geometry either by periodic surface deformation or by adding an array of high index pillars. Transmittivity higher than 80% is found when surface plasmons are excited at both interfaces, in a symmetric configuration.
authors.forename: Nicolas
authors.initials: N
authors.lastname: Bonod
authors.forename: Stefan
authors.initials: S
authors.lastname: Enoch
authors.forename: Lifeng
authors.initials: L
authors.lastname: Li
authors.forename: Popov
authors.initials: P
authors.lastname: Evgeny
authors.forename: Michel
authors.initials: M
authors.lastname: Neviere