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

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Veröffentlicht in:	Nature Communications 9(2018) Artikel-Nummer 1447, 10 Seiten
Personen und Körperschaften:	Gaafar, Mahmoud Abdelaziz (VerfasserIn), Jalas, Dirk (VerfasserIn), O'Faolain, Liam (VerfasserIn), Li, Juntao (VerfasserIn), Krauss, Thomas F. (VerfasserIn), Petrov, Alexander (VerfasserIn), Eich, Manfred (VerfasserIn), Technische Universität Hamburg (Sonstige, Sonstige Körperschaft), Technische Universität Hamburg Institut für Optische und Elektronische Materialien (Sonstige, Sonstige Körperschaft)
Titel:	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 & Manfred Eich
Format:	E-Book-Kapitel
Sprache:	Englisch
veröffentlicht:	13 April 2018
Gesamtaufnahme:	: Nature Communications, 9(2018) Artikel-Nummer 1447, 10 Seiten , volume:9
Schlagwörter:	optical materials and structures optics and photonics slow light
Quelle:	Verbunddaten SWB Lizenzfreie Online-Ressourcen

Details
Zusammenfassung:	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.
Umfang:	Diagramme 10
ISSN:	2041-1723
DOI:	10.1038%2Fs41467-018-03862-0