Title: Experimental Study on Localized Surface Plasmon Mode Hybridization in the Near and Mid Infrared
Language: English
Authors: Srajer, Johannes 
Schwaighofer, Andreas  
Ramer, Georg  
Frank, Pinar 
Lendl, Bernhard  
Nowak, Christoph 
Category: Research Article
Issue Date: 2014
Journal: Plasmonics
ISSN: 1557-1963
We investigate plasmon excitations within a regular grating of double layered gold/insulator nanoparticles in the infrared and visible spectral region. Provided a flat gold film as substrate, strong coupling between the localized surface plasmon modes and their image like excitations in the metal is observed. The interaction results in a strong red shift of the plasmon mode as well as the splitting of the modes into levels of different angular momenta, often referred to as plasmon hybridization. The diameters of the nanoparticles are designed in a way that the splitting of the resonances occurs in the spectral region between 0.1 to 1 eV, thus being accessible using an infrared microscope. Moreover, we investigated the infrared absorption signal of gratings that contain two differently sized nanoparticles. The interaction between two autonomous localized surface plasmon excitations is investigated by analyzing their crossing behavior. In contrast to the interaction between localized surface plasmons and propagating plasmon excitations which results in pronounced anticrossing, the presented structures show no interaction between two autonomous localized surface plasmons. Finally, plasmon excitations of the nanostructured surfaces in the visible spectral region are demonstrated through photographs acquired at three different illumination angles. The change in color of the gratings demonstrates the complex interaction between propagating and localized surface plasmon modes.
Keywords: Surface enhancement; Plasmon excitation; Localized surface plasmon; Plasmon hybridization; IR spectroscopy
DOI: 10.1007/s11468-014-9690-7
Library ID: AC15518668
URN: urn:nbn:at:at-ubtuw:3-7462
Organisation: E164 - Institut für Chemische Technologien und Analytik 
Publication Type: Article
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