title: Dependence of extrinsic loss on group velocity in photonic crystal waveguides.
abstract: 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 sub-linearly 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.
authors: Liam
authors: L
authors: O'Faolain
authors: Thomas P
authors: TP
authors: White
authors: David
authors: D
authors: O'Brien
authors: Xiadong
authors: X
authors: Yuan
authors: Michael D
authors: MD
authors: Settle
authors: Thomas F
authors: TF
authors: Krauss