Supermode dispersion and waveguide-to-slot mode transition in arrays of silicon-on-insulator waveguides

de Nobriga, C.E., Hobbs, G.D., Wadsworth, W.J., Knight, J.C., Skryabin, D.V., Samarelli, A., Sorel, M. and De La Rue, R.M. (2010) Supermode dispersion and waveguide-to-slot mode transition in arrays of silicon-on-insulator waveguides. Optics Letters, 35(23), pp. 3925-3927. (doi: 10.1364/OL.35.003925)

Abstract

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.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Sorel, Professor Marc and De La Rue, Professor Richard and Samarelli, Mr Antonio
• Authors: de Nobriga, C.E., Hobbs, G.D., Wadsworth, W.J., Knight, J.C., Skryabin, D.V., Samarelli, A., Sorel, M., and De La Rue, R.M.
• College/School: College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
• Journal Name: Optics Letters
• Publisher: Optical Society of America
• ISSN: 0146-9592
• ISSN (Online): 1539-4794