Antenna Sensing of Surface Phonon Polaritons

Resonant coupling between the plasmonic excitation of gold nanoantennas and phonon polaritons of a dielectric substrate−surface layer of about 3 nm thickness produces significant Fano-type signals from that layer in the infrared extinction spectrum of the fundamental antenna resonance. Compared to i...

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Bibliographic Details
Published in:Journal of physical chemistry. C 2010-04, Vol.114 (16), p.7299-7301
Main Authors: Neubrech, Frank, Weber, Daniel, Enders, Dominik, Nagao, Tadaaki, Pucci, Annemarie
Format: Article
Language:English
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Summary:Resonant coupling between the plasmonic excitation of gold nanoantennas and phonon polaritons of a dielectric substrate−surface layer of about 3 nm thickness produces significant Fano-type signals from that layer in the infrared extinction spectrum of the fundamental antenna resonance. Compared to infrared transmittance spectra without gold antennas, the vibrational signal from the layer is about 1900 times enhanced and it is observed at surface phonon polariton frequencies of the layer, not at the transverse optical phonon frequency.
ISSN:1932-7447
1932-7455
DOI:10.1021/jp908921y