Berlin 2012 – scientific programme
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O: Fachverband Oberflächenphysik
O 3: Plasmonics and nanooptics I
O 3.8: Talk
Monday, March 26, 2012, 12:15–12:30, MA 005
Optical Nanoantennas for Ultrafast Spectroscopy of Single Nanoobjects — •Thorsten Schumacher1,2, Daniela Ullrich1,2, Mario Hentschel1,2, Harald Giessen2, and Markus Lippitz1,2 — 1Max Planck Institute for Solid State Research, Stuttgart — 24th Physics Institute, University of Stuttgart
Ultrafast nonlinear spectroscopy investigates the deviations from linear light-matter interaction on very short timescales. The already weak signals are reduced further when single nanoobjects such as quantum dots, molecules, or nanoparticles are the systems of interest. Considering the example of a mechanically oscillating single gold nanodisc, we demonstrate how such a weak nonlinear response can be enhanced by one order of magnitude using an optical nanoantenna. Our numerical model explains all experimantally observed effects of the antenna. Furthermore it allows us to perform optimization studies to obtain more effective antenna structures to reach higher enhancement factors. Finally we give an outlook on our work on enhancing the nonlinear response of colloidal quantum dots.