Abstract
We Make an analytical study of a waveguide whose guiding cross-section is bounded by two equiangular spirals in which core and cladding regions are filled with different dielectric materials having refractive index n1 and n2 where n1>n2. The characteristic equation is derived under the scalar wave approximation for weak guidance. Dispersion curves and cutoff curve are also shown and interpreted. Unlike the planar waveguide, a nonzero cutoff is deduced which may be attributed to the curvature of the boundaries and the flare.
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