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

Mahmoud A. Gaafar (), Dirk Jalas, Liam O’Faolain, Juntao Li (), Thomas F. Krauss, Alexander Yu. Petrov and Manfred Eich
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Mahmoud A. Gaafar: Hamburg University of Technology
Dirk Jalas: Hamburg University of Technology
Liam O’Faolain: University of St. Andrews
Juntao Li: Sun Yat-sen University
Thomas F. Krauss: University of York
Alexander Yu. Petrov: Hamburg University of Technology
Manfred Eich: Hamburg University of Technology

Nature Communications, 2018, vol. 9, issue 1, 1-10

Abstract: 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.

Date: 2018
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DOI: 10.1038/s41467-018-03862-0

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