Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 2: Plasmonics and Nanooptics I: Light-Matter Interaction
O 2.3: Vortrag
Montag, 7. März 2016, 11:15–11:30, S054
Far-field interferometry of weak plasmonics scatterers — •Christian Dicken1, Daniela Wolf1, Thorsten Schumacher1, Klas Lindfors2, Harald Giessen3, and Markus Lippitz1 — 1Institute of Experimental Physics III, University of Bayreuth, Germany — 2Department of Chemistry, Nanooptics Group, University of Cologne, Germany — 3Institute of Experimental Physics IV, University of Stuttgart, Germany
Low-loss noble metals like gold and silver are at the heart of plasmonics. Yet, many applications focus on metals with higher losses and less pronounced optical response. We discuss how a simple mirror and a dielectric spacer layer turn a transmission experiment into an interferometer. This scheme is used by us in a simple model to optimize the sensitivity to small changes of the optical response of weak scattereres. In particular, we present interferometrically detected magnetic hysteresis loops of sub-100nm nickel disks and compare the data with our model.