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Oldenburger Forschung als Motor für Innovationen // Universität Oldenburg

https://uol.de/aktuelles/artikel/oldenburger-forschung-als-motor-fuer-innovationen-1662

Das Niedersächsische Wissenschaftsministerium fördert künftig neun anwendungsorientierte Forschungsprojekte aus den Mitteln des Europäischen Fonds für regionale Entwicklung (EFRE) – zwei davon an der Universität Oldenburg.
Oliver Zielinski Institut für Chemie und Biologie des Meeres Tel: 0441/798-3518 oliver.zielinski

Second-order calculation of the local density of states above a nanostructured surface

https://uol.de/f/5/inst/physik/ag/condmat/shadow_files/p_prbnanostruct2010.html?v=1432744496

We have numerically implemented a perturbation series for the scattered electromagnetic fields above rough surfaces, due to Greffet, allowing us to evaluate the local density of states to second order in the surface profile function.We present typical results for thermal near fields of surfaces with regular nanostructures, investigating the relative magnitude of the contributions appearing in successive orders. The method is then employed for estimating the resolution limit of an idealized near-field scanning thermal microscope.
states above a nanostructured surface Author(s): Felix Rueting, Svend-Age Biehs, Oliver

Perturbation theory for plasmonic eigenvalues

https://uol.de/f/5/inst/physik/ag/condmat/shadow_files/p_prb09.html?v=1432744496

We develop a perturbative approach for calculating, within the quasistatic approximation, the shift of surface resonances in response to a deformation of a dielectric volume. Our strategy is based on the conversion of the homogeneous system for the potential which determines the plasmonic eigenvalues into an inhomogeneous system for the potential’s derivative with respect to the deformation strength and on the exploitation of the corresponding compatibility condition. The resulting general expression for the first-order shift is verified for two explicitly solvable cases and for a realistic example of a deformed nanosphere. It can be used for scanning the huge parameter space of possible shape fluctuations with only quite small computational effort.
plasmonic eigenvalues Author(s): Daniel Grieser, Hannes Uecker , Svend-Age Biehs, Oliver