Dresden 2006 – scientific programme
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O: Oberflächenphysik
O 29: Poster session II (Nanostructures, Magnetism, Particles and clusters, Scanning probe techniques, Time-resolved spectroscopy, Structure and dynamics, Semiconductor surfaces and interfaces, Oxides and insulators, Solid-liquid interfaces)
O 29.14: Poster
Wednesday, March 29, 2006, 14:30–17:30, P2
Surface Plasmon Polariton excitation on gratings with tunable grating constant — •Michael Berndt1,2, Stephanie Rehwald1,2, Frank Katzenberg3, Klaus Schierbaum2, and Dominic Zerulla1 — 1UCD Dublin, School of Physics, Dublin 4, Ireland — 2Heinrich-Heine-Universität Düsseldorf, Materialwissenschaft, 40225 Düsseldorf, Germany — 3Universität Dortmund, Werkstoffe und Korrosion, 44227 Dortmund, Germany
For the excitation of Surface Plasmon Polaritons (SPP) grating couplers with tunable periodicity have been developed. Since the excitation of SPPs for a given grating period is restricted to a single, fixed wavelength at a certain angle of incidence, the possibility of adjusting the grating period provides much more flexibility to match resonance conditions, e. g. with respect to changes in the excitation wavelength.
Therefore the polymer based gratings present a well adapted substrate for extremely surface sensitive spectroscopic methods like Surface Plasmon Resonance (SPR) or Surface Enhanced Raman Scattering (SERS).
The grating coupler consists of a polymer base upon which a sinusoidal structure is generated. Subsequently, the system is coated with a suitable metal (e.g. silver, gold, or aluminium).
Even though the metal stripes are separated by a nonconducting polymer, a strong surface plasmon resonance is observed. The experimentally obtained SPP dispersion relation is in good agreement with theoretical predictions with respect to an effective dielectrical constant for the metal-polymer surface.