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

L. Shi, T Hakala, H.T. Rekola, J.-P. Martikainen, R.J. Moerland, Päivi Törmä

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

151 Sitaatiot (Scopus)
718 Lataukset (Pure)

Abstrakti

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.
AlkuperäiskieliEnglanti
Artikkeli153002
Sivut1-5
Sivumäärä5
JulkaisuPhysical Review Letters
Vuosikerta112
Numero15
DOI - pysyväislinkit
TilaJulkaistu - 18 huhtikuuta 2014
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

Tutkimusalat

  • plasmonics
  • spatial coherence
  • strong coupling
  • surface lattice resonances

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