Spatial Coherence Properties of Organic Molecules Coupled to Plasmonic Surface Lattice Resonances in the Weak and Strong Coupling Regimes

Loading...
Thumbnail Image
Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2014-04-18
Major/Subject
Mcode
Degree programme
Language
en
Pages
5
1-5
Series
PHYSICAL REVIEW LETTERS, Volume 112, issue 15
Abstract
We study spatial coherence properties of a system composed of periodic silver nanoparticle arrays covered with a fluorescent organic molecule (DiD) film. The evolution of spatial coherence of this composite structure from the weak to the strong coupling regime is investigated by systematically varying the coupling strength between the localized DiD excitons and the collective, delocalized modes of the nanoparticle array known as surface lattice resonances. A gradual evolution of coherence from the weak to the strong coupling regime is observed, with the strong coupling features clearly visible in interference fringes. A high degree of spatial coherence is demonstrated in the strong coupling regime, even when the mode is very excitonlike (80%), in contrast to the purely localized nature of molecular excitons. We show that coherence appears in proportion to the weight of the plasmonic component of the mode throughout the weak-to-strong coupling crossover, providing evidence for the hybrid nature of the normal modes.
Description
Keywords
plasmonics, spatial coherence, strong coupling, surface lattice resonances
Other note
Citation
Shi , L , Hakala , T , Rekola , H T , Martikainen , J-P , Moerland , R J & Törmä , P 2014 , ' Spatial Coherence Properties of Organic Molecules Coupled to Plasmonic Surface Lattice Resonances in the Weak and Strong Coupling Regimes ' , Physical Review Letters , vol. 112 , no. 15 , 153002 , pp. 1-5 . https://doi.org/10.1103/PhysRevLett.112.153002