期刊
JOURNAL OF OPTICS
卷 19, 期 4, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2040-8986/aa600d
关键词
optomechanics; nonlinear optics; silicon photonics; Brillouin scattering
类别
资金
- IWT
- FWO
- VOCATIO
- NSF [ECCS-1509107]
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1509107] Funding Source: National Science Foundation
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) 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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