Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 52: Focussed session: Coherence and coherent control in nanophotonics and plasmonics II
O 52.6: Vortrag
Mittwoch, 28. März 2012, 18:45–19:00, MA 005
Hybridization of dark & bright modes leading to longlived plasmonic coherences on a corrugated silver surface — Martin Aeschlimann1, Tobias Brixner2, Alexander Fischer1, Christian Kramer2, Pascal Melchior1, Walter Pfeiffer3, Christian Schneider1, •Christian Strüber3, Philip Tuchscherer2, and Dmitri V. Voronine4 — 1Technische Universität Kaiserslautern, Germany — 2Universität Würzburg, Germany — 3Universität Bielefeld, Germany — 4Texas A&M University, College Station, USA
The hybridization of dark and bright plasmonic modes leads to Fano resonances and electronically induced transparency phenomena. So far these effects have been observed only in engineered nanostructures. Coherent 2D nanoscopy, a combination of coherent 2D spectroscopy and time-resolved photoemission electron microscopy (PEEM), reveals longlived plasmonic coherences and quantum beats on a randomly structured silver surface [1]. The unexpectedly long coherence lifetime of about 100 femtoseconds is explained by hybridization of dark and bright modes, formed by multiply scattered surface plasmon polaritons (SPPs) and localized SPPs, respectively. Fitting the measured spectra using either a two mode hybridization model or unconstrained parameters reveals sharp Fano-like resonances in the local response. The results emphasize that dark modes, i.e. modes coupled weakly to the radiation field, support longlived coherent states even in highly scattering environment.
[1] M. Aeschlimann et al., Science 333, 1723-1726 (2011)