Patent ID: 6867865

Claim:
An SPR sensor ( 1 ) comprising: a source ( 3 ) for coherent monochromatic electromagnetic waves ( 4 ); a medium ( 7 ) with a tunable index of refraction; and an imaging detection system ( 5 ), wherein the medium ( 7 ) is designed as an optical resonator ( 2 ) that has a first ( 25 ) and a second opposing end face ( 26 ), upon each of which is applied at least one coating ( 8 , 9 , 9 ′) that is suitable for producing surface plasmon resonances, and wherein the imaging detection system ( 5 ) has a polarization device ( 29 ) and is designed such that at least one ellipsometric quantity produced by the SPR sensor ( 1 ) in the reflected part ( 17 ) of the incident coherent monochromatic electromagnetic wave ( 4 ) can be detected.