Berlin 2012 – scientific programme
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O: Fachverband Oberflächenphysik
O 26: Plasmonics and nanooptics II
O 26.6: Talk
Tuesday, March 27, 2012, 11:45–12:00, MA 005
Quantitative measurement of scattering and absorption cross-sections of individual nano-objects — •Martin Husnik1, Stefan Linden2,3, Richard Diehl4, Jens Niegemann4, Kurt Busch4,5, and Martin Wegener1,3 — 1Institut für Angewandte Physik and DFG-Center for Functional Nanostructures (CFN), Karlsruhe Institute of Technology (KIT), 76128 Karlsruhe, Germany — 2Physikalisches Institut, Universität Bonn, 53115 Bonn, Germany — 3Institut für Nanotechnologie, Karlsruhe Institute of Technology (KIT), 76344 Eggenstein-Leopoldshafen, Germany — 4Institut für Theoretische Festkörperphysik and DFG-Center for Functional Nanostructures (CFN), Karlsruhe Institute of Technology (KIT), 76128 Karlsruhe, Germany — 5Institut für Physik, Humboldt-Universität zu Berlin, and Max-Born-Institut, 12489 Berlin, Germany
The physics and applications of nanostructures are a rapidly growing field of research in photonics. Determining the scattering and absorption cross-sections of individual particles quantitatively would significantly increase the understanding of the optical properties of nanoparticles.
Here, we combine a previously developed spatial modulation technique with a polarization-sensitive common-path interferometer. This enables the simultaneous measurement of both the absolute scattering and absorption cross-sections of single particles. Example spectra of individual straight antennas, split-ring resonators, and intermediates will be presented and compared with numerical calculations based on a Discontinuous Galerkin Time-Domain (DGTD) approach.