PROBES OF ENHANCED SENSITIVITY FOR ADSORBED MOLECULES DETECTION

摘要

A device consisting of a porous medium (2) in contact with a thin metallic film (3) on which surface plasmons are excited. The aim of the device is to enhance the changes of the surface plasmon excitation curve due to the adsorption of molecules on the porous surface in comparison with corresponding adsorption on the non-porous surface. Adsorption occurs on the free or on suitably modified surface of the porous media, either from liquid or gaseous phase. Detection is realized by recording and processing of the surface plasmon excitation curve under internal total refection conditions. The use of porous medium in contact with the metallic film, results in an enhancement in the change of the excitation curve by at least a factor of 10 in comparison with the adsorption on a non-porous surface.