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6 May 2008 Finite element analysis of waveguide mode coupling through a sub-structured metallic flat lens
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Abstract
In this paper we present a numerical analysis of a planar or sub-structured metallic flat lens for mode coupling between a pair of waveguides. The analysis of periodically sub-structured silver coupler is based on the finite element model of the device. The uniform and infinite double layered silver coupler is also considered, and is modelled with the transfer matrix method. The study is focused on minimising propagation losses and optimising the coupling coefficient, which is calculated from the transfer properties of the lens for a Gaussian distribution of the modal fields. The analysis reveals the importance of the periodic nanostructure of the silver layers for reaching a coupling efficiency which is higher than could be obtained with uniform layers or with air.
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Rafał Kasztelanic and Rafał Kotyński "Finite element analysis of waveguide mode coupling through a sub-structured metallic flat lens", Proc. SPIE 6987, Metamaterials III, 698727 (6 May 2008); https://doi.org/10.1117/12.786381
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