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In JoVE (1)
Other Publications (2)
Articles by Isabella H. Rey in JoVE
Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
Christopher Paul Reardon1, Isabella H. Rey1, Karl Welna1, Liam O'Faolain1, Thomas F. Krauss1
1School of Physics & Astronomy, University of St Andrews
Other articles by Isabella H. Rey on PubMed
Optics Express. Feb, 2011 | Pubmed ID: 21369277
We demonstrate continuous wave four-wave mixing in silicon photonic crystal waveguides of 396 Î¼m length with a group index of ng=30. The highest observed conversion efficiency is -24 dB for 90 mW coupled input pump power. The key question we address is whether the predicted fourth power dependence of the conversion efficiency on the slowdown factor (Î·â‰ˆS4) can indeed be observed in this system, and how the conversion efficiency depends on device length in the presence of propagation losses. We find that the expected dependencies hold as long as both realistic losses and the variation of mode shape with slowdown factor are taken into account. Having achieved a good agreement between a simple analytical model and the experiment, we also predict structures that can achieve the same conversion efficiency as already observed in nanowires for the same input power, yet for a device length that is 50 times shorter.
Physical Review Letters. May, 2012 | Pubmed ID: 23003252
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 Î¼m 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.