|Publisher DOI:||10.1038/s41467-018-03862-0||Title:||Reflection from a free carrier front via an intraband indirect photonic transition||Language:||English||Authors:||Gaafar, Mahmoud A.
Krauss, Thomas F.
|Keywords:||optical materials and structures;optics and photonics;slow light||Issue Date:||13-Apr-2018||Publisher:||Nature Publishing Group UK||Source:||Nature communications 1 (9): 1447 (2018)||Journal or Series Name:||Nature communications||Is corrected by:||10.15480/882.1769||Abstract (english):||The reflection of light from moving boundaries is of interest both fundamentally and for applications in frequency conversion, but typically requires high pump power. By using a dispersion-engineered silicon photonic crystal waveguide, we are able to achieve a propagating free carrier front with only a moderate on-chip peak power of 6 W in a 6 ps-long pump pulse. We employ an intraband indirect photonic transition of a co-propagating probe, whereby the probe practically escapes from the front in the forward direction. This forward reflection has up to 35% efficiency and it is accompanied by a strong frequency upshift, which significantly exceeds that expected from the refractive index change and which is a function of group velocity, waveguide dispersion and pump power. Pump, probe and shifted probe all are around 1.5 µm wavelength which opens new possibilities for "on-chip" frequency manipulation and all-optical switching in optical telecommunications.||URI:||http://hdl.handle.net/11420/1679.3||DOI:||10.15480/882.1676.3||ISSN:||2041-1723||Institute:||Optische und Elektronische Materialien E-12||Type:||(wissenschaftlicher) Artikel|
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|3||doi:10.15480/882.1676.3||2019-08-27 13:38:35.268||An Author Correction to this article was published on 20 August 2018. Thd PDF has been updated with a link to the correction.|
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