Guided Bloch Surface Waves on Ultrathin Polymeric Ridges
Nano Letters2010Vol. 10(6), pp. 2087–2091
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Emiliano Descrovi, Tristan Sfez, Marzia Quaglio, Daniele Brunazzo, Lorenzo Dominici, Francesco Michelotti, Hans Peter Herzig, Olivier J. F. Martin, Fabrizio Giorgis
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.