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 American Institute of Physics. DOI: 10.1063/1.2824387
Coupling of surface waves in highly defined one-dimensional porous silicon photonic crystals for gas sensing applications / Descrovi, Emiliano; Frascella, Francesca; Sciacca, Beniamino; Geobaldo, Francesco; Dominici, L; Michelotti, F.. - In: APPLIED PHYSICS LETTERS. - ISSN 0003-6951. - STAMPA. - 91:(2007), pp. 241109-241111. [10.1063/1.2824387]
Coupling of surface waves in highly defined one-dimensional porous silicon photonic crystals for gas sensing applications
DESCROVI, EMILIANO;FRASCELLA, FRANCESCA;SCIACCA, BENIAMINO;GEOBALDO, 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 American Institute of Physics. DOI: 10.1063/1.2824387Pubblicazioni consigliate
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https://hdl.handle.net/11583/1676726
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