title: Single negative birefringence in stacked spoof plasmon metasurfaces by prism experiment.
abstract: We report negative and positive refraction in a prism made of stacked perforated thin surfaces for s and p polarization, respectively. By corrugating the subwavelength slits of a free-standing periodic arrangement, geometrically induced surface-plasmon-like currents are excited and transmission is allowed under s polarization (electric-field vector parallel to the slit). When several of those corrugated slit arrays are subwavelength stacked, the stack behaves as a negative effective index medium (because of double negativity) under s polarization, whereas it behaves as a positive effective index medium under p polarization. The birefringence has been confirmed by the usual wedge experiment in the millimeter-wave range.
authors.affiliation: Millimeter and Terahertz Waves Laboratory, Universidad Pública de Navarra, Campus Arrosadía, 31006 Pamplona, Spain.
authors.forename: M
authors.initials: M
authors.lastname: Beruete
authors.forename: M
authors.initials: M
authors.lastname: Navarro-Cía
authors.forename: F
authors.initials: F
authors.lastname: Falcone
authors.forename: I
authors.initials: I
authors.lastname: Campillo
authors.forename: M
authors.initials: M
authors.lastname: Sorolla