Surface plasmon resonance using As2S3 film for water salinity detection

Abstract

Amorphous chalcogenide As2S3 films used in surface plasmon resonance structures improves the sensitivity of sensors using such structures by providing them with sharp resonance characteristics: changes at the sixth decimal of the ambient medium refractive index cause important changes of the reflectivity. This high sensitivity is fructified to determine the salinity of the water. The salinity of the water changes the refractive index of the water under test and these changes are put in evidence by the plasmon resonance.