Abstract
Surface plasmon resonance and optical interference techniques at planar surfaces are able to give information about protein binding at that interface. The signal can be resolved to allow an optical thickness to be derived giving concentration estimates with a resolution of the order of 10 −4M. The techniques do not directly resolve structure or surface profile. Adoption of a substrate with a periodic diffracting structure gives greater resolution of the surface profile through the diffracted orders and thus also leads to an optical description of the structure of the adsorbed overlayer.
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