Finite element and perturbative study of buffered leaky planar waveguides


Uranus, H.P. and Hoekstra, H.J.W.M. and Groesen, E. van (2005) Finite element and perturbative study of buffered leaky planar waveguides. Optics Communications, 253 (1-3). pp. 99-108. ISSN 0030-4018

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Abstract:The effects of the presence of a high-index medium in the proximity of planar waveguiding structures that makes up buffered leaky waveguides, were studied using a finite element method (FEM) leaky mode solver and a perturbation method. Various phenomena observed in the FEM results were interpreted through the approximate analytical expressions derived using the perturbation method. The effect of the buffer layer thickness, the high-index medium refractive index, and the quasi-confinement of the modal field were investigated. The results show that the perturbation due to the high-index medium can lead to either an increase or a decrease of the real part of the effective index, and that the leakage loss of a TE-polarized mode is not always lower than TM-polarized mode of the same order. It was found that if the refractive index of the high-index medium goes to infinity, a leaky-wave structure evolves into a guided-wave structure.
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Copyright:© 2005 Elsevier B.V.
Electrical Engineering, Mathematics and Computer Science (EEMCS)
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