MULTIPLE BOUND-STATES IN SHARPLY BENT WAVE-GUIDES

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.