Vol. 12, No. 14 July 12, 2004 Page: 3156 - 3170


                  Bragg reflection waveguides with a matching layer 




                  Amit Mizrahi and Levi Schächter, Technion - Israel Institute 
                  of Technology 




                  Abstract
                  It is demonstrated that Bragg reflection waveguides, either 
                  planar or cylindrical, can be designed to support a symmetric 
                  mode with a specified core field distribution, by adjusting 
                  the first layer width. Analytic expressions are given for this 
                  matching layer, which matches between the electromagnetic 
                  field in the core, and a Bragg mirror optimally designed for 
                  the mode. This adjustment may change significantly the 
                  characteristics of the waveguide. At the particular wavelength 
                  for which the waveguide is designed, the electromagnetic field 
                  is identical to that of a partially dielectric loaded metallic 
                  or perfect magnetic waveguide, rather than a pure metallic 
                  waveguide. Either a planar or coaxial Bragg waveguide is shown 
                  to support a mode that has a TEM field distribution in the 
                  hollow region.