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Unattenuated global modes in a planar dielectric waveguide with a flare in the direction of propagation
Author(s) -
Singh D. B.,
Khastgir P.,
Singh U. K.,
Singh O. N.
Publication year - 1998
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/(sici)1098-2760(199809)19:1<77::aid-mop21>3.0.co;2-#
Subject(s) - planar , flare , waveguide , dielectric , physics , optics , computer science , optoelectronics , astrophysics , computer graphics (images)
In this paper, continuing our earlier work on the modal properties of a planar waveguide with a flare, we examine whether unattenuated guided modes can exist in such waveguides. We use the scalar wave approximation and the cylindrical polar coordinates (ρ, ϕ, z ) in a new way. Ordinarily, the guiding region lies between two distinct values of ρ, and the propagation is along the z ‐axis. In our case, however, we take the propagation in the ρ‐direction, and the guiding region is bounded by two planes corresponding to two slightly different values of ϕ. This represents a planar waveguide with a flare, and we obtain the modal characteristic equation for unattenuated modes. Numerical computation shows the surprising result that global unattenuated modes can be sustained in such a structure for ν=0, where ν is the modal index corresponding to the ϕ‐coordinate. © 1998 John Wiley & Sons, Inc. Microwave Opt Technol Lett 19: 77–80, 1998.