Descrovi, EmilianoSfez, TristanQuaglio, MarziaBrunazzo, DanieleDominici, LorenzoMichelotti, FrancescoHerzig, Hans PeterMartin, Olivier J. F.Giorgis, Fabrizio2011-04-112011-04-112011-04-11201010.1021/nl100481qhttps://infoscience.epfl.ch/handle/20.500.14299/66113WOS:000278449200019We 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.Surface electromagnetic wavesnear-field optical microscopyDimensional Photonic CrystalsElectromagnetic-WavesPlasmon ModesLightPropagationScatteringBiosensorsSensortext::journal::journal article::research article