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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. 
Jalas, Dirk 
O'Faolain, Liam 
Li, Juntao 
Krauss, Thomas F. 
Petrov, Alexander 
Eich, Manfred 
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 
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.
DOI: 10.15480/882.1676
ISSN: 2041-1723
Institute: Optische und Elektronische Materialien E-12 
Type: (wissenschaftlicher) Artikel
Appears in Collections:Publications (tub.dok)

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