Ultrafast tunable optical delay line based on indirect photonic transitions

Daryl Matthew Beggs, Isabella Helen Rey, Tobias Kampfrath, Nir Rotenberg, L. Kuipers, Thomas Fraser Krauss

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47 Citations (Scopus)
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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 mu m 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.

Original languageEnglish
Article number213901
Number of pages4
JournalPhysical Review Letters
Issue number21
Publication statusPublished - 21 May 2012


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