Ultrafast tunable optical delay line based on indirect photonic transitions
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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.
Beggs , D M , Rey , I H , Kampfrath , T , Rotenberg , N , Kuipers , L & Krauss , T F 2012 , ' Ultrafast tunable optical delay line based on indirect photonic transitions ' Physical Review Letters , vol 108 , no. 21 , 213901 . , 10.1103/PhysRevLett.108.213901
Physical Review Letters
© 2012 American Physical Society
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