Dresden 2006 – wissenschaftliches Programm
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O: Oberflächenphysik
O 18: Nanostructures II
O 18.1: Vortrag
Dienstag, 28. März 2006, 11:15–11:30, PHY C213
Surface Plasmon Polariton Excitation on Tuneable Nanostructured Surfaces — •Dominic Zerulla1, Stephanie Rehwald1,2, Brian Ashall1, Gillian Doyle1, Michelle Galvin1, Michael Berndt1,2, and Klaus Schierbaum2 — 1UCD Dublin, School of Physics, Dublin 4, Ireland — 2Heinrich-Heine-University Düsseldorf, Materialwissenschaft, 40225 Düsseldorf, Germany
Surface Plasmon Polaritons (SPPs) allow for extremely surface sensitive spectroscopic methods like Surface Plasmon Resonance (SPR) or Surface Enhanced Raman Scattering (SERS) which, play a fast-growing role in the Life Sciences.
The conditions for their excitation by photons are quite restrictive. On smooth metal surfaces a Kretschmann or Otto-type attenuated total reflection (ATR) setup is needed to generate an SPP. Using periodically nano- or mesostructured surfaces liberates from the ATR-restrictions,
but a rigid nanostructure only allows for the excitation of SPPs for a single, fixed wavelength at a given angle of incidence.
In order to gain more flexibility, e.g. in the light of tuneable laser sources, we are the first to design tuneable nanostructured surface on which a plasmon excitation is possible over a broad wavelength region.
The nanostructures consist of a polymer base upon which the periodic structure is generated. Subsequently, the system is coated with a suitable metal (e.g. silver, gold, or aluminium) but is still tuneable with respect to changes in the excitation wavelength. The effect is proved by showing the full, experimentally derived dispersion relation of the SPP in comparison to theoretical predictions.