title: Guided Bloch surface waves on ultrathin polymeric ridges.
abstract: We present a direct evidence of Bloch surface waves (BSWs) waveguiding on ultrathin polymeric ridges, supported by near-field measurements. It is demonstrated that near-infrared BSWs sustained by a silicon-based multilayer can be locally coupled and guided through dielectric ridges of nanometric thickness with low propagation losses. Using a conventional prism-based configuration, we demonstrate a wavelength-selective BSW coupling inside and outside the ridge. Such a result can open interesting opportunities in surface wave-mediated sensing applications, where light could be selectively coupled in specific regions defined by nanometric reliefs.
authors.affiliation: Materials and Microsystems Laboratory, Politecnico di Torino, C.so Duca degli Abruzzi 24, IT-10129 Torino, Italy. emiliano.descrovi@polito.it
authors.forename: Emiliano
authors.initials: E
authors.lastname: Descrovi
authors.forename: Tristan
authors.initials: T
authors.lastname: Sfez
authors.forename: Marzia
authors.initials: M
authors.lastname: Quaglio
authors.forename: Daniele
authors.initials: D
authors.lastname: Brunazzo
authors.forename: Lorenzo
authors.initials: L
authors.lastname: Dominici
authors.forename: Francesco
authors.initials: F
authors.lastname: Michelotti
authors.forename: Hans Peter
authors.initials: HP
authors.lastname: Herzig
authors.forename: Olivier J F
authors.initials: OJ
authors.lastname: Martin
authors.forename: Fabrizio
authors.initials: F
authors.lastname: Giorgis