Berlin 2012 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 29: Posters II
DY 29.1: Poster
Donnerstag, 29. März 2012, 17:00–19:00, Poster A
Bound states in bent waveguides — Stefan Bittner1, Barbara Dietz1, Jochen Isensee1, Maksim Miski-Oglu1, Achim Richter1,2, and •Christopher Ripp1 — 1Institut für Kernphysik Darmstadt — 2ECT* Trento
Bound states in quantum wires or open electromagnetic waveguides with curves, bends or bulges have received much interest for several reasons. Firstly, they can modify the transmission properties of such devices, and secondly, their existence is a purely wave-dynamical phenomenon which has no classical analogue. Different geometries and the properties of the bound states of quantum wires and electromagnetic waveguides, which are described by the same Helmholtz equation, have been investigated extensively both theoretically and experimentally. We present microwave experiments with sharply bent waveguides. The interesting feature of such waveguides is that not only one, but arbitrarily many bound states can exist depending on the angle of the bend: new bound states emerge at certain critical angles. Several waveguides with bend angles close to these critical ones were investigated. The resonance frequencies and field distributions were measured experimentally and compared to theoretical calculations. Good agreement was found and the values for the critical angles were confirmed. Furthermore, the effect of the finite length of the waveguide was investigated. The work presented on this poster was supported by the DFG within SFB 634.