Strong enhancement of Raman-induced nonreciprocity in silicon waveguides by alignment with the crystallographic axes

Krause, Michael; Renner, Hagen; Brinkmeyer, Ernst
December 2009
Applied Physics Letters;12/28/2009, Vol. 95 Issue 26, p261111
Academic Journal
Raman gain in silicon photonic wires depends on the relative propagation directions of the pump and Stokes waves due to strong longitudinal mode-field components. Here we show that this Raman-induced nonreciprocity can be varied in a wide range by changing the orientation of the waveguide with respect to the crystallographic axes. In a <001> orientation, the nonreciprocity reaches its maximum which is larger by more than two orders of magnitude as compared to the traditional <011> orientation. The waveguide is then practically Raman-inactive for copropagation, while the contradirectional Stokes wave may experience significant Raman gain.


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