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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.
Romain Christophe Rémy Fleury, Maliheh Khatibi Moghaddam
Olivier Martin, Benjamin Gallinet, Giorgio Quaranta, Fabian Michael Lütolf
Hans Peter Herzig, Myun Sik Kim, Maria-Pilar Bernal