We have measured and modeled the spectral group index of the supermodes of a two channel silicon photonic wire array. We observe the transition from two coupled waveguides to a single guided slot mode.
De Nobriga, C., Hobbs, G., Ding, W., Gorbach, A., Wadsworth, W. J., Knight, J. C., Skryabin, D. V., Samarelli, A., Sorel, M., & De La Rue, R. M. (2010). Supermode dispersion and mode transitions in silicon-on-insulator waveguide arrays. Paper presented at Nonlinear Photonics 2010, Karlsruhe, Germany. https://doi.org/10.1364/NP.2010.NME1