Dresden 2009 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 31: Nano-optics of metallic and semiconducting nanostructures (theory)
O 31.6: Vortrag
Mittwoch, 25. März 2009, 11:45–12:00, SCH A216
Collective Surface Plasmons in Metallic Nanorod Arrays — •René Kullock1, William R. Hendren2, Andreas Hille1, Stefan Grafström1, Paul R. Evans2, Robert J. Pollard2, Ron Atkinson2, 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
Metallic nanorod arrays exhibit several surface plasmon resonances: a short-axis resonance that occurs always [1], and several long-axis resonances appearing for p-polarized light under specific incident angles [2]. Until today, time-consuming numerical calculations were needed to fully describe these properties theoretically. Here we use propagating surface plasmons for an easier description.
Starting with single nanowires exhibiting surface plasmon polaritons (SPPs) we show how the SPPs on nanowires arranged in parallel couple to form collective surface plasmons (CSPs), which have a drastically changed dispersion. For nanorod arrays, such CSPs can be excited by illumination with p-polarized light. Since these arrays act as resonators, CSPs oscillate inside the structures and obey a standing wave condition [3]. Hence, with our model a fast prediction of the optical properties is possible which allows for an easy optimization of these structures for specific purposes and applications.
[1] R. Atkinson et al., Phys. Rev. B 73, 235402 (2006)
[2] P. Evans et al., Adv. Func. Mater. 18, 1075 (2008)
[3] R. Kullock et al., Opt. Express (2008) submitted