Thermal Brillouin noise observed in silicon optomechanical waveguide
Thermal Brillouin noise observed in silicon optomechanical waveguide
复制标题
硅光机械波导中观察到的热布里渊噪声
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
A. Safavi
中科院分区：
文献类型：
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作者：
R. Van Laer;Christopher J. Sarabalis;R. Baets;D. van Thourhout;A. Safavi
最近在纳米硅波导中观察到了受激布里渊散射。令人惊讶的是，这些结构中的热驱动光子-声子转换还没有报道。在这里，我们在悬浮的硅波导中注入一个光学探头，并在输出端测量它的相位波动。我们在8 GHz附近观察到了机械共振，其散射效率为10−5m−1，信噪比为2。观察到的结果与这些波导中的噪声理论以及模拟测量结果是一致的。我们的方案可以简化纳米尺度波导中机械信号的测量，并朝着更好地掌握这些新的连续谱光学机械系统中的热噪声迈出了一步。
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.