In this Letter, we report group index measurements of the supermodes of an array of two strongly coupled silicon-on-insulator waveguides. We observe coupling-induced dispersion that is greater than the material and waveguide dispersion of the individual waveguides. We demonstrate that the system transforms from supporting the two supermodes associated with two coupled waveguides to the single mode of a slot waveguide within the investigated spectral range. During the cutoff of the antisymmetric supermode, an anti-crossing between the symmetric TM and antisymmetric TE supermodes has been observed.
© 2010 Optical Society of AmericaFull Article | PDF Article
Eric Dulkeith, Fengnian Xia, Laurent Schares, William M. J. Green, and Yurii A. Vlasov
Opt. Express 14(9) 3853-3863 (2006)
Christopher J. Benton and Dmitry V. Skryabin
Opt. Express 17(7) 5879-5884 (2009)
Lin Zhang, Yang Yue, Yinying Xiao-Li, Jian Wang, Raymond G. Beausoleil, and Alan E. Willner
Opt. Express 18(12) 13187-13193 (2010)