Abstract
Out-of-plane losses are the major issue in the integration of two-dimensional
photonic crystal devices in photonic integrated circuits. In this paper, we
show that the out-of-plane losses of pillar-based photonic crystal waveguides
can be vastly reduced, even for pillars with a low vertical index contrast,
such as in InP/InGaAsP/InP technology. These low losses are obtained by creating
confinement between the pillars with a polymer layer stack. We show that the
spatial frequency component of the Bloch mode in the first Brillouin zone
(i.e., the component inside the light cone), is significantly suppressed by
the optimized polymer layer stack.
© 2009 IEEE
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