ORC Seminar Series
“Fano Resonances in Reduced-Symmetry Plasmonic Nanocavities ”
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Speaker: Professor Victor V. Moshchalkov, INPAC, K. U. Leuven, B-3001 Leuven, Belgium
Date: 19 February 2010
Time: 2pm
Venue: B46 ORC Boardroom
Abstract:
V.V. Moshchalkov 1, N. Verellen 1,2,3, Y. Sonnefraud 4, H. Sobhani 5, F. Hao 5, G.A.E. Vandenbosch 3, P. Van Dorpe 2, P. Nordlander 5 and S. A. Maier 4
1) INPAC, K. U. Leuven, B-3001 Leuven, Belgium, 2) IMEC, Kapeldreef 75, 3001 Leuven, Belgium, 3) ESAT-TELEMIC, K. U. Leuven, B-3001 Leuven, Belgium, 4) Experimental Solid State Group, Physics Department, Imperial College, London, UK, 5) Department of Physics and Astronomy, Rice University, Houston, Texas 77005-1892
Plasmonic nanostructures can serve as model systems for a variety of fascinating classical oscillator physics. For example, in nanostructures with broken symmetry, Fano resonances can arise due to the dispersive interaction of spectrally broad dipolar modes with sharper, higher-order modes [1]. Using confocal spectroscopy of individual nanocavities we demonstrate the presence of Fano resonances in two plasmonic systems: an Au dimer/monomer (dolmen) slab structure proposed by Zhang et al [2], and a side-by-side arrangement of an Au ring and disk (ring near disk cavity). We analyze the dependence of the Fano lineshapes on the polarization of the incident light and of the strength of the features on the separation between the individual nanoscale sub-units. We further show that for significantly broad dipolar modes, multiple Fano resonances can arise. The nature of the involved plasmon modes is revealed by numerical electromagnetic simulations. Plasmonic cavities with Fano resonances are of interest in a context of plasmonic nanolasing, slow-light metamaterials and are promising candidates for surface enhanced spectroscopy and refractive index sensing. References
[1] F. Hao, Y. Sonnefraud, P. Van Dorpe, et al, Nano Letters 8, 3983 (2008). [2] S. Zhang, D. A. Genov, Y. Wang, et al, Phys. Rev. Lett. 101, 047401 (2008).
Biography:
Education:
1975: Ms. Sc., Moscow State University, Russia
1978: Dr. Sc., Moscow State University, Russia
1985: Habilitation, Moscow State University
Professional career:
1978 1988: Research Physicist, Assistant Professor, Professor at Lomonosov Moscow State University
1988-1991: Head of the Laboratory of High Temperature Superconductivity, Lomonosov Moscow State University
1986-1991:Visiting Professor at Toronto University (Canada) TH Darmstadt, Marburg University, RWTH Aachen, Germany 1990: Visiting Scientist at Centre d’Etudes Nucléaires de Grenoble, France
1991 1993:Visiting Professor at Katholieke Universiteit Leuven, Belgium
1993-… Full Professor at the K.U.Leuven, Leuven, Belgium
1999-2004:Chairman of the ESF Programme “Vortex Matter in Superconductors-VORTEX“
2005-… Director of INPAC-Institute for Nanoscale Physics and Chemistry (Center of Excellence at the K.U. Leuven)
2004-… Co-chairman of the Global Research Networking Programme (Japan-EU-USA) “Nanoscience and Engineering in Superconductivity-NES”
2007-… Chairman of the ESF-NES Programme (60 teams from 15 European countries)
Awards/other information:
1986: Laureate of the USSR State Prize for Young Researchers
1988: Laureate of the USSR Ministry of High Education Scientific Prize
2000: ISI Thomson Scientific Award “Top Cited Paper in Flanders”
2005: Laureate of the Belgian FWO Dr. A.De Leeuw-Damry-Bourlart Prize for Exact Sciences
2006: Finalist for the EU Descartes Research Prize
2007: The American Physical Society Fellow