Regensburg 2007 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 42: Methods: Scanning Probe Techniques III

O 42.2: Vortrag

Mittwoch, 28. März 2007, 16:00–16:15, H41

Plasmons in metallic bilayer wave guides — •Andreas Englisch, Stefan Griesing, and Uwe Hartmann — Institute of Experimental Physics, Saarland University, P.O. Box 15 11 50, D-66041 Saarbruecken

Plasmons constitute a strongly confined electromagnetic field. Plasmon-guiding metal stripes in a planar geometry exhibit a spatial extent of the electromagnetic field of the order of the decay lenght in the dielectric environment (several hundreds of nanometers) perpendicular to the metal surfaces. Cross coupling of different plasmon paths can thus not be avoided for smaller distances. A new geometry is introduced, which consists of two metal films separated by a dielectric layer. The theoretically predicted confinement is now limited by the decay length given for the metal films (50-100 nm). It is possible to construct junctions of arbitrary angles between the plasmon paths. The results of calculations of the field distribution and the power flow are presented as well as those of measurements by Scanning Near-Field Optical Microscopy. The potential of the given geometry to affect the propagation properties of the guided plasmons by a small change of the boundary conditions will be discussed.