Regensburg 2013 – scientific programme

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O: Fachverband Oberflächenphysik

O 49: Symposium Quantum Plasmonics (SYQP, jointly with HL, TT)

O 49.3: Invited Talk

Wednesday, March 13, 2013, 16:00–16:30, H1

Optically-active hybrid nanostructures: Exciton-plasmon interaction, Fano effect, and plasmonic chirality — •Alexander Govorov — Ohio University, Athens, OH, USA

Excitons and plasmons in nanocrystals strongly interact via Coulomb and electromagnetic fields and this interaction leads to characteristic interference effects which can be observed in optical spectra. An interaction between a discrete state of exciton and a continuum of plasmonic states gives rise to Fano-like asymmetric resonances and anti-resonances [1,2]. These interference effects can strongly enhance visibility of relatively weak exciton signals and can be used for spectroscopy of single nanoparticles and molecules. If a system includes chiral elements (chiral molecules or nanocrystals), the exciton-plasmon interaction is able to alter and enhance circular dichroism (CD) of chiral components [3,4]. Recent experiments on molecule-nanocrystal and multi-nanocrystal complexes have confirmed our predictions [4]. Potential applications of dynamic hybrid nanostructures include sensors and new optical and plasmonic materials.

1. W. Zhang, G. W. Bryant, A. O. Govorov, Phys. Rev. Lett. 97, 146804 (2006). 2. M. Kroner, A. O. Govorov, S. Remi, B. Biedermann, S. Seidl, A. Badolato, P. M. Petroff, W. Zhang, R. Barbour, B. D. Gerardot, R. J. Warburton, and K. Karrai, Nature 451, 311 (2008). 3. A.O. Govorov, Z. Fan, P. Hernandez, J.M. Slocik, R.R. Naik, Nano Letters 10, 1374 (2010). 4. A. Kuzyk, R. Schreiber, Z. Fan, G. Pardatscher, E.-M. Roller, A. Högele, F.C. Simmel, A. O. Govorov, T. Liedl, Nature, 483, 311 (2012).