Regensburg 2004 – wissenschaftliches Programm
CPP 10.4: Vortrag
Montag, 8. März 2004, 16:30–16:45, H 38
High Sensitivity Setup for Surface Plasmons — •Marc Schneider1,2, Audree Andersen1, and Hubert Motschmann1 — 1Max Planck Institute of Colloids and Interfaces, D-14476 Golm — 2INFM Genoa, I-16146 Genoa
A surface plasmon is a bound electromagnetic wave propagating at the metal-dielectric interface. In Surface Plasmon Resonance spectroscopy (SPR), an external laser field drives the free electron gas of metal in a distinct mode, the so-called surface plasmon. The spatial charge distribution creates an electric field, which is localized at the metal-dielectric interface.
Because of this particular localization of the field, no signal comes from the bulk, the plasmon resonance is extremely sensitive to the prevailing interfacial architecture. Thus, an absorption process leads to a shift in the plasmon resonance, allowing one to measure the mass coverage at the surface with very high accuracy.
In this contribution we are comparing advantages and disadvantages for two schemes allowing to track the surface resonance in a kinetic mode with a high temporal (µs) and angular resolution (0.0001 degree). The results are illustrated by selected experiments. following the change in refractive index due to temperature changes of air.