Abstract
Wideband slow light in an ellipse-shaped-hole slotted photonic crystal waveguide (ESPCW) has been
theoretically demonstrated. By adjusting the length of major and minor axes of air holes and tuning the holes position
of the second row adjacent to the slot, the group index and bandwidth of slow light can be engineered effectively at
the same time. Through the optimization of ESPCW structures by the plane wave expansion (PWE) method, the nearly
constant group indices at 46, 80.7, and 215.5 are obtained, and we accordingly attain the flat bandwidths of 4.81,
2.66, and 1.02 nm around the operating frequency of 1550 nm, while the variation of each group index is
restricted within ±10% range. Meanwhile, the normalized delay-bandwidth product stays around 0.14, with
minimal dispersion on the order of 10
$^6 $
ps
$^{2}$
/km for all the cases.
© 2014 IEEE
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