| http://www.w3.org/ns/prov#value | - In another, especially preferred embodiment of a planar optical structure according to the invention for generating an evanescent-field measuring platform, the structure is a planar optical film waveguide, comprising a first essentially optically transparent, waveguiding layer (a) with refractive index n1 and a second essentially optically transparent layer (b) with refractive index n2, where n1>n
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