This paper investigates the slow light propaga-
tion in silicon on insulator wide slot photonic crystal
waveguides (PCWs). Two design schemes are presented,
relying on the dispersion engineering of hole lattice and
slot, respectively. Mode patterns and band diagrams are
calculated by 3D-plane wave expansion method. Then,
coupling and slow light propagations are modeled using
finite difference time domain method in a full Mach-
Zehnder interferometer (MZI). Results show high ampli-
tudes interference fringes and high coupling efficiencies.
Fabrication and measurement of devices lead to slow light
propagation with group indices above 50, while multiple
scattering and localized modes near the band edge also
observed. This study provides insights for losses in hollow
core slot high group index waveguides.

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• Large group-index bandwidth product empty core slow light photonic crystal waveguides for hybrid silicon photonics