We investigate nanostructured surfaces consisting of a hexagonal lattice of polymeric pillars embedded in a gold matrix. These systems are prepared by a new fabrication technique based on plasma assisted deposition and colloidal lithography. A complete characterization of such surfaces is performed by angle resolved reflectance and transmittance measurements. Both delocalized and localized plasmonic modes can be identified: their reciprocal interplay allows to observe spectral features and to detect refractive index changes related to one of the sample interfaces by measurements performed with a light beam incident from the opposite side. This intriguing behaviour, together with ease of use and low cost of the deposition procedure, make this kind of nanostructures particularly interesting in biosensing applications.
Plasmonic resonances in nanostructured gold/polymer surfaces by colloidal lithography
GIUDICATTI, SILVIA;MARABELLI, FRANCO;
2010-01-01
Abstract
We investigate nanostructured surfaces consisting of a hexagonal lattice of polymeric pillars embedded in a gold matrix. These systems are prepared by a new fabrication technique based on plasma assisted deposition and colloidal lithography. A complete characterization of such surfaces is performed by angle resolved reflectance and transmittance measurements. Both delocalized and localized plasmonic modes can be identified: their reciprocal interplay allows to observe spectral features and to detect refractive index changes related to one of the sample interfaces by measurements performed with a light beam incident from the opposite side. This intriguing behaviour, together with ease of use and low cost of the deposition procedure, make this kind of nanostructures particularly interesting in biosensing applications.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
