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approvedosi15_summary_pucci.pdf2015-03-24 07:12:11Annemarie Pucci


Author: Annemarie Pucci
Requested Type: Pre-Selected Invited
Submitted: 2015-03-24 06:23:01

Co-authors: C. Huck, J. Vogt

Contact Info:
Kirchhoff Institute for Physics, Univ. Heidelberg
Im Neuenheimer Feld 227
Heidelberg,   69120

Abstract Text:
Surface enhanced infrared absorption (SEIRA) of molecules as obtained with resonant plasmonic nanorods (as the simplest or basic structure) gives huge (up to six orders of magnitude) enhancement of vibrational signals. In order to obtain such enhancement safely, all the details of the Fano-type coupling between the vibrational oscillators and the plasmonic "continuum" should be under control. The main issue is the nanorod resonance itself which gives rise to near-field enhancement and to far-field extinction. Since nanorods that are resonant in the IR have a length of the order of the wavelength, their extinction consists of plasmonic absorption and plasmonic scattering which both enable SEIRA, but in a different way. Therefore, the real material properties and the geometric dimensions of the rods play an important role. For example, SEIRA (with up to three orders of magnitude in enhancement) as obtained with metal-nanoisland films can be understood as an effect solely related to plasmonic absorption. SEIRA signals can be further increased with higher resonant near-fields that are provided in narrow gaps of nanorod dimers, for example, and by exploiting interference effects.

Category1.0 would also fit.