Stimulated optomechanical excitation of surface acoustic waves in a microdevice
Stimulated optomechanical excitation of surface acoustic waves in a microdevice
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DOI：
10.1038/ncomms1412
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发表时间：
2011-07-01
影响因子：
16.6
通讯作者：
Carmon, Tal
中科院分区：
文献类型：
--
作者：
Bahl, Gaurav;Zehnpfennig, John;Carmon, Tal
声与光之间的受激布里渊相互作用，已知是所有非晶和晶体共同的最强光学非线性，已经在纤维和块状材料中被广泛研究，但很少在光学微谐振器中被研究。实验扩展这一原则的可能性，激发在光子微系统中的机械共振，传感和频率参考应用，仍然在很大程度上未被探索。挑战在于，微谐振器固有地具有大的自由光谱范围，而布里渊过程的相位匹配考虑需要附近频率的光学模式，但具有不同的波矢量。在这里，我们依赖于高阶横向光学模式，以放宽这一限制，并报告实验激发的机械共振范围从49至1,400兆赫，通过使用前向布里渊散射。这些自然的机械共振激发类似于100 μ m的二氧化硅微球，是一个表面声学回音壁类型。
Stimulated Brillouin interaction between sound and light, known to be the strongest optical nonlinearity common to all amorphous and crystalline dielectrics, has been widely studied in fibres and bulk materials but rarely in optical microresonators. The possibility of experimentally extending this principle to excite mechanical resonances in photonic microsystems, for sensing and frequency reference applications, has remained largely unexplored. The challenge lies in the fact that microresonators inherently have large free spectral range, whereas the phase-matching considerations for the Brillouin process require optical modes of nearby frequencies but with different wave vectors. Here we rely on high-order transverse optical modes to relax this limitation and report the experimental excitation of mechanical resonances ranging from 49 to 1,400 M MHz by using forward Brillouin scattering. These natural mechanical resonances are excited in similar to 100 mu m silica microspheres, and are of a surface-acoustic whispering-gallery type.