1 research outputs found
Coupling between a Molecular Charge-Transfer Exciton and Surface Plasmons in a Nanostructured Metal Grating
The
interaction of molecular excitons in organic thin films with
surface plasmon polaritons (SPPs) in nanostructured metal electrodes
represents a unique opportunity for enhancing the properties of the
active layer of a photoconversion device. We present evidence of hybridization
between charge-transfer excitons (CTEs) in 3,4,9,10-perylenetetracarboxylic
dianhydride (PTCDA) and SPP modes in silver grating nanostructures.
Molecular and SPP absorption peaks exhibit avoided crossings in angle-dependent
reflectivity experiments, which are verified by electromagnetic-field
simulations of the PTCDA-grating structure. Photoluminescence measurements
indicate that the radiative decay of the CTE is enhanced. Besides
energetic resonance, selective coupling between the SPP and the exciton
in this unique case may be aided by the oriented nature of PTCDA into
1-D “molecular stacks” as well as the delocalized nature
of the CTE