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Authors: R. Van Laer, C. J. Sarabalis, R. Baets, D. Van Thourhout, A. H. Safavi-Naeini
Title: Thermal Brillouin noise observed in silicon optomechanical waveguide
Format: International Journal
Publication date: 3/2017
Journal/Conference/Book: Journal of Optics
Editor/Publisher: IOP Publishing, 
Volume(Issue): 19(4) p.044002
DOI: 10.1088/2040-8986/aa600d
Citations: 11 ( - last update: 7/7/2024)
9 (OpenCitations - last update: 27/6/2024)
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Stimulated Brillouin scattering was recently observed in nanoscale silicon waveguides. Surprisingly, thermally-driven photon–phonon conversion in these structures had not yet been reported. Here, we inject an optical probe in a suspended silicon waveguide and measure its phase fluctuations at the output. We observe mechanical resonances around 8 GHz with a scattering efficiency of ${10}^{-5}\,{{\rm{m}}}^{-1}$ and a signal-to-noise ratio of 2. The observations are in agreement with a theory of noise in these waveguides as well as with stimulated measurements. Our scheme may simplify measurements of mechanical signatures in nanoscale waveguides and is a step towards a better grasp of thermal noise in these new continuum optomechanical systems.

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