We describe the use of one-dimensional porous silicon (p-Si) photonic crystals for guiding TE-polarized surface electromagnetic waves (SEWs). Although bulk and interface roughnesses might deteriorate the optical response of photonic structures, we observed reflection spectra presenting narrow (?6?nm) reflectivity anomalies associated with SEWs. In analogy with surface plasmons, SEWs are strongly sensitive to surface modifications. As a proof of principle for a sensor, we provide a direct real-time monitoring of the reversible interactions of organic vapors with the p-Si multilayer. We highlight the higher sensitivity of the SEW-based detection scheme as compared to a method exploiting perturbations of waveguide modes.

Coupling of surface waves in highly defined one-dimensional porous silicon photonic crystals for gas sensing applications / Descrovi, E; Frascella, F; Sciacca, B; Geobaldo, F; Dominici, Lorenzo; Michelotti, Francesco. - In: APPLIED PHYSICS LETTERS. - ISSN 0003-6951. - STAMPA. - 91:(2007), pp. 241109-1-241109-3. [10.1063/1.2824387]

Coupling of surface waves in highly defined one-dimensional porous silicon photonic crystals for gas sensing applications

DOMINICI, Lorenzo;MICHELOTTI, Francesco
2007

Abstract

We describe the use of one-dimensional porous silicon (p-Si) photonic crystals for guiding TE-polarized surface electromagnetic waves (SEWs). Although bulk and interface roughnesses might deteriorate the optical response of photonic structures, we observed reflection spectra presenting narrow (?6?nm) reflectivity anomalies associated with SEWs. In analogy with surface plasmons, SEWs are strongly sensitive to surface modifications. As a proof of principle for a sensor, we provide a direct real-time monitoring of the reversible interactions of organic vapors with the p-Si multilayer. We highlight the higher sensitivity of the SEW-based detection scheme as compared to a method exploiting perturbations of waveguide modes.
2007
01 Pubblicazione su rivista::01a Articolo in rivista
Coupling of surface waves in highly defined one-dimensional porous silicon photonic crystals for gas sensing applications / Descrovi, E; Frascella, F; Sciacca, B; Geobaldo, F; Dominici, Lorenzo; Michelotti, Francesco. - In: APPLIED PHYSICS LETTERS. - ISSN 0003-6951. - STAMPA. - 91:(2007), pp. 241109-1-241109-3. [10.1063/1.2824387]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/358074
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