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Resonantly excited electromagnetic near fields of metal nanostructures are used to enhance infrared vibrational signals of different molecules located in the vicinity of the structures. Accompanied with the signal enhancement is a change of the vibrational line shape due to the coupling between the plasmonic excitation and the vibrational one. In our presentation we will discuss this coupling effect and demonstrate possible applications for early disease diagnosis in medicine.

Plasmonics; Infrared spectroscopy; SEIRA