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Coupled mode theory for resonant excitation of waveguiding structures

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Abstract

Resonant coupling of light beams via high-index media or gratings to planar waveguiding structures are of interest for both applications and from a theoretical point of view. Coupled Mode theory (CMT) can give an accurate description of the coupling process in terms of relatively simple expressions involving often a large number of coupling parameters. In this paper it is shown, using time reversal and energy conservation how these parameters are interrelated. The evaluation of the remaining independent parameters is shown to be possible using a few reflection and transmission coefficients for incoming plane waves, including in the calculations, if present, the effect of the grating. Further, it is proved that under certain condition a grating coupler may show exactly 100% reflection. Analytical expressions for the reflected and transmitted beams and the amplitude distribution of the excited mode are given for the case of incoming Gaussian beams. A few applications of the theory and considerations on its applicability are presented.

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Authors and Affiliations

  1. MESA Research Institute, University of Twente, P.O. box 217, 7500, AE Enschede, The Netherlands

    Hugo J.W.M. Hoekstra

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  1. Hugo J.W.M. Hoekstra
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Hoekstra, H.J. Coupled mode theory for resonant excitation of waveguiding structures. Optical and Quantum Electronics 32, 735–758 (2000). https://doi.org/10.1023/A:1007006226372

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