Dresden 2017 – scientific programme
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O: Fachverband Oberflächenphysik
O 11: Plasmonics and Nanooptics II: Light-Matter Interaction
O 11.6: Talk
Monday, March 20, 2017, 16:15–16:30, TRE Ma
Plasmon-exciton coupling in microcavities — •Igor Shavrin1, Mario Hentschel2, Daniel E. Gómez3,4, Dirk Hertel1, Klaus Meerholz1, Timothy J. Davis3,4, Harald Giessen2, and Klas Lindfors1 — 1Department of Chemistry, University of Cologne, Luxemburger Str. 116, 50939 Köln, Germany — 24th Physics Institute and Research Center SCOPE, University of Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany — 3CSIRO, Materials Science and Engineering, Private Bag 33, Clayton, Victoria, 3168, Australia — 4Melbourne Centre for Nanofabrication, Australian National Fabrication Facility, Clayton VIC 3168, Australia
Strong interactions between plasmons and excitonic states are interesting due to the extreme field confinement in plasmon resonant structures [1]. So far strong plasmon-exciton coupling has been achieved by placing the excitonic material in the near-field of a metal nanostructure. This however results in strong quenching of fluorescence.
Here we study the plasmon-exciton coupling mediated by a microcavity mode. We fabricate gold nanorod antennas in a wavelength-thick thin-film microcavity with the antennas positioned at one of the field anti-nodes using dielectric spacer layers. At the other anti-node we deposit a thin film of merocyanine molecules. These molecules form large J-aggregates that exhibit excitons with a strong dipole moment and therefore resulting in enhanced light-matter coupling. We observe three avoided crossings in reflection spectra that are well explained by a model with three coupled oscillators.
[1] J. Bellessa et al., Phys. Rev. Lett. 93, 036404 (2004).