Supermode dispersion and waveguide-to-slot mode transition in arrays of silicon-on-insulator waveguides.
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.
Centre for Photonics and Photonic Materials, Department of Physics, University of Bath, Claverton Down, Bath, BA2 7AY, UK. py3cedn@bath.ac.uk
Charles E
CE
de Nobriga
Gareth D
GD
Hobbs
William J
WJ
Wadsworth
Jonathan C
JC
Knight
Dmitry V
DV
Skryabin
Antonio
A
Samarelli
Marc
M
Sorel
Richard M
RM
De La Rue