title: Ultrafast tunable optical delay line based on indirect photonic transitions.
abstract: We introduce the concept of an indirect photonic transition and demonstrate its use in a dynamic delay line to alter the group velocity of an optical pulse. Operating on an ultrafast time scale, we show continuously tunable delays of up to 20 ps, using a slow light photonic crystal waveguide only 300 μm in length. Our approach is flexible, in that individual pulses in a pulse stream can be controlled independently, which we demonstrate by operating on pulses separated by just 30 ps. The two-step indirect transition is demonstrated here with a 30% conversion efficiency.
authors.affiliation: FOM Institute AMOLF, Science Park 104, 1098XG Amsterdam, The Netherlands. beggs@amolf.nl
authors.forename: Daryl M
authors.initials: DM
authors.lastname: Beggs
authors.forename: Isabella H
authors.initials: IH
authors.lastname: Rey
authors.forename: Tobias
authors.initials: T
authors.lastname: Kampfrath
authors.forename: Nir
authors.initials: N
authors.lastname: Rotenberg
authors.forename: L
authors.initials: L
authors.lastname: Kuipers
authors.forename: Thomas F
authors.initials: TF
authors.lastname: Krauss