| 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 (Dimensions.ai - last update: 21/4/2024)
7 (OpenCitations - last update: 19/4/2024)
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Abstract
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. Related Research Topics
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