We report the first demonstration of on-chip stimulated Brillouin scattering (SBS) with low average power. The measured Brillouin shift and line width are ~7.7 GHz and ~6 MHz in a 7 cm long chalcogenide waveguide.

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The ability to control the speed of light on an optical chip is fundamental to the development of nanophotonic components for alloptical signal processing and sensing [1][2][3][4][5][6][7]. However this is a significant challenge, because chip-scale waveguides require very large changes in group index (Δn g ) to achieve appreciable pulse delays. Here, we use Stimulated Brillouin Scattering (SBS) to report the demonstration of on-chip slow, fast and negative group velocities with Δn g ranging from −44 to +130, and delays of up to 23ns at a pump power of ~300mW and propagation length of 7cm. These results are obtained using a highly-nonlinear chalocogenide (As 2 S 3 ) rib waveguide, in which the confinement of both photons and phonons results in strong interaction. SBS can be used to achieve controllable pulse delays at room temperature over a large wavelength and signal-bandwidth [5]. These results open up a new set of photonic applications ranging from microwave photonics [8] to spectrometry [4].

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