Berlin 2008 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 66: Metallic Nanostructures I (on Metals)
O 66.5: Vortrag
Donnerstag, 28. Februar 2008, 13:45–14:00, MA 041
Optical Properties of Metal Nanorod Arrays — •René Kullock1, Paul R. Evans2, Robert J. Pollard2, and Lukas M. Eng1 — 1Institut für Angewandte Photophysik, TU Dresden, 01062 Dresden, Germany — 2Centre for Nanostructured Media, IRCEP, The Queens University of Belfast, Belfast BT7 1NN, UK
Single gold or silver nanorods strongly interact with visible light due to surface plasmon resonances (SPRs) [1]. By periodically arranging multiple nanorods, these SPRs can be easily tuned [2], hence allowing such structures to be used either for manipulating optical light transmission or generating high optical near-field strengths.
Here, we report on the optical near- and far-field properties of such gold and silver nanorod arrays with individual rods of 300 nm length and 20 nm width beeing arranged with a 60 nm periodicity. Using the semi-analytical method of multiple-multipoles, we study the electromagnetic near-field distribution of the SPRs, which are completely changed compared to the single nanorod case, and strongly depend on the geometry of our structures. Hence, we are able to identify various modes having different energies and shapes [3]. Furthermore, we are also interested on the far-field properties of the structure, and therefore investigate the influence of the structure on light transmission both theoretically and expmerimentally. Finally, applications of these near- and far-field effects in such structures are discussed.
[1] S. Link et al., J. Phys. Chem. B 103, 3073 (1999).
[2] R. Atkinson et al., Phys. Rev. B 73, 235402 (2006).
[3] P. Evans et al., submitted.