the paraxial wave equation
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Preventing the Breakdown of Tight-Binding Waveguide Optics by L\"owdin Orthogonalization
arXiv:2605.31074v1 Announce Type: new Abstract: Many advancements in optics have relied on the tight-binding approximation, which simplifies the description and prediction of complex system behaviors. This approximation describes the dynamics of the total light field by examining the coupling between the guided modes of individual single-mode substructures -- also known as coupled mode theory. However, the underlying assumption, that the guided modes of individual waveguides form an...