Journal
OPTICS EXPRESS
Volume 15, Issue 20, Pages 13129-13138Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.15.013129
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We examine the effects of disorder on propagation loss as a function of group velocity for W1 photonic crystal (PhC) waveguides. Disorder is deliberately and controllably introduced into the photonic crystal by pseudo-randomly displacing the holes of the photonic lattice. This allows us to clearly distinguish two types of loss. Away from the band-edge and for moderately slow light ( group velocity c/20-c/30) loss scales sublinearly with group velocity, whereas near the band-edge, reflection loss increases dramatically due to the random and local shift of the band-edge. The optical analysis also shows that the random fabrication errors of our structures, made on a standard e-beam lithography system, are below 1 nm root mean square. (C) 2007 Optical Society of America.
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