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O: Fachverband Oberflächenphysik
O 3: Plasmonics and nanooptics I
O 3.7: Talk
Monday, March 26, 2012, 12:00–12:15, MA 005
Towards Synthesis and Investigation of Surface Plasmon Polariton Lasers — •Günter Kewes1, Andreas Ott1,2, Yan Lu1,2, Matthias Ballauff1,2, and Oliver Benson1 — 1Humboldt Universität Berlin — 2Helmholtz Zentrum Berlin
Surface plasmons attract a lot of research interests because of their wide range of applications in nanophotonics, but the field is gathering for an active element, e.g. a surface plasmon polariton laser (spaser) [1]. Coherent amplification of radiation through excitation of surface plasmons in dye-doped Au-SiO2 core-shell nanoparticles is investigated to synthesize a spaser. Spherical and rod-like Au nanoparticles with tuneable plasmon resonances are covered with a silica shell by a modified Stöbe method. A suitable dye (according to the surface plasmon excitation) is incorporated to generate a gain medium that compensates for the absorption loss in the metal [2]. The emission of the nanoparticles is observed through a home-built confocal microscope with single molecule sensitivity where the nanoparticles can be identified and manipulated by an atomic force microscope at the same time [3].
References: [1] M. A. Noginov, et al., Nature 460, 1110 (2009). [2] W. Ni, et al., J. Am. Chem. Soc. 132, 4806 (2010). [3] S. Schietinger, et al., Nano Lett. 9, 1694 (2009).