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Reflection from a free carrier front via an intraband indirect photonic transition

Author

Listed:
  • Mahmoud A. Gaafar

    (Hamburg University of Technology
    Menoufia University)

  • Dirk Jalas

    (Hamburg University of Technology)

  • Liam O’Faolain

    (University of St. Andrews
    Tyndall National Institute
    Cork Institute of Technology)

  • Juntao Li

    (Sun Yat-sen University)

  • Thomas F. Krauss

    (University of York)

  • Alexander Yu. Petrov

    (Hamburg University of Technology
    ITMO University)

  • Manfred Eich

    (Hamburg University of Technology
    Helmholtz-Zentrum Geesthacht)

Abstract

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.

Suggested Citation

  • Mahmoud A. Gaafar & Dirk Jalas & Liam O’Faolain & Juntao Li & Thomas F. Krauss & Alexander Yu. Petrov & Manfred Eich, 2018. "Reflection from a free carrier front via an intraband indirect photonic transition," Nature Communications, Nature, vol. 9(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-03862-0
    DOI: 10.1038/s41467-018-03862-0
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