Abstract
Flatband slow light in a ring-shape-hole photonic crystal waveguide
(RPCW) has been theoretically investigated. Numerical results show that both
the outer and inner radii of the first two rows of holes adjacent to the defect
have much affect on slow light properties. Therefore, by appropriately modifying
the outer and inner radii of the ring-shaped holes, the slow light property
is successfully optimized. Then we further enlarge the flat bandwidth by introducing
the oblique structure. The negligible dispersion bandwidths ranging from 3.57
to 24.67 nm for group indexes from 28 to 115 are obtained, respectively, which
is effectively improved if compared with other RPCW structures in previous
works. Moreover, we also discussed the buffer capability and signal transmission
characters of the RPCW. The result shows that the proposed structure has considerable
potential for optical buffering applications.
© 2011 IEEE
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