Improved coupled-mode theory for high-index-contrast photonic platforms
Qing Li, Gregory T. Moille, Hossein Taheri, Ali Adibi, Kartik Srinivasan
Coupled-mode theory has been widely used in optics and photonics design. Despite its popularity, several different formulations of coupled-mode theory exist in the literature and their applicable range is not entirely clear, in particular when it comes to high-index- contrast photonics platforms. Here we propose an improved formulation of coupled-mode theory and demonstrate its superior performance through numerical simulations. In particular, application of the improved coupled-mode theory to asymmetric waveguides reveals a necessary correction in the conventional phase matching condition for high-index-contrast materials, which could lead to more accurate photonic circuit designs involving asymmetric elements.
, Moille, G.
, Taheri, H.
, Adibi, A.
and Srinivasan, K.
Improved coupled-mode theory for high-index-contrast photonic platforms, Physical Review A, [online], https://doi.org/10.1103/PhysRevA.102.063506
(Accessed September 21, 2021)