Dresden 2014 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

O: Fachverband Oberflächenphysik

O 37: Posters: Plasmonics, Electronic Structure and Spin-Orbit Interaction, Semiconductor and Insulator Surfaces, Nanostructures

O 37.6: Poster

Dienstag, 1. April 2014, 18:30–22:00, P2

Mueller matrix characterization of three-dimensional gold spiral nanostructures — •Elvira Mbekwe Pafong, Audrey Berrier, Bruno Gompf, Bettina Frank, Harald Giessen, and Martin Dressel — Physikalisches Institut and Research Center SCoPE, Pfaffenwaldring 57, 70550 Stuttgart

Mueller matrix (MM) spectroscopy is a powerful tool to characterize nanostructures as it provides both amplitude and phase information. The decomposition of the measured MM grants the extraction of all the optical parameters such as linear birefringence/dichroism and circular birefringence/dichroism. However, it is difficult to attribute effective parameters to artificial nanostructures, especially when they are three-dimensional (3D). A full characterization in a large frequency range and broad reciprocal space is therefore necessary. Along with angle-resolved transmission measurements to determine the spectral position and the dispersion of the resonant modes, we perform MM spectroscopy to obtain phase information and compare the optical behaviour to that of conventional crystals. The measured MM elements are compared with simulations based on general oscillator models taking into account the azimuthal and spectral positions of the resonances. We find that the 3D nanospirals exhibit a complex optical response that cannot be reproduced by basic optical properties such as birefringence or optical activity only. Spirals with different geometries are compared in order to extract the optical response intrinsic to their 3D nature. This study sheds light on the complex response of plasmonic nanostructures and is useful for future designs of novel optical devices.