Multiple bound states in sharply bent waveguides

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Abstract
We present experimental and theoretical results on bound states in rectangular bent waveguides. Such bound states can be observed in electromagnetic waveguides and quantum wires. For a class of bent waveguides one can produce confined TE modes; such TE modes are directly related to bound states of scalar fields in the curved two-dimensional space from which the waveguides are constructed. For sufficently sharp bends, one can produce multiple bound TE modes. We calculate the bound-state energies and field configurations for a particular class of sharply bent waveguides. These waveguides are constructed, and both bound-state energies and fields are directly measured and compared with theoretical predictions. DOI: http://dx.doi.org/10.1103/PhysRevB.48.4503 Received 17 March 1993Published in the issue dated 15 August 1993© 1993 The American Physical Society

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