Cavity optomechanics on a microfluidic resonator with water and viscous liquids
Cavity optomechanics on a microfluidic resonator with water and viscous liquids
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DOI：
10.1038/lsa.2013.66
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发表时间：
2013-11-01
影响因子：
19.4
通讯作者：
Carmon, Tal
中科院分区：
文献类型：
--
作者：
Kim, Kyu Hyun;Bahl, Gaurav;Carmon, Tal
目前，光学共振和机械共振是微流体研究中常用的方法。然而，光压引起的光力学振荡在液体中没有表现出来。这是因为用水代替周围空气本质上增加了声阻抗，从而增加了相关的声辐射损失。在这里，我们通过制造一个内部有液体的空心气泡谐振器和光激励振动，在微流体和光力学之间架起桥梁，仅使用毫瓦的光输入功率。这构成了第一次任何微流体系统是光机械驱动的。我们进一步证明了微流体光力学在液体上的可行性，展示了粘性耗散高于血液粘度的有机流体的振动，并通过振动频移测量了液体的密度变化。我们的设备将能够使用腔光力学来研究物质的非固相，而光很容易从毛细管的外部干燥侧耦合，并且使用标准注射泵提供流体。
Currently, optical or mechanical resonances are commonly used in microfluidic research. However, optomechanical oscillations by light pressure were not shown with liquids. This is because replacing the surrounding air with water inherently increases the acoustical impedance and hence, the associated acoustical radiation losses. Here, we bridge between microfluidics and optomechanics by fabricating a hollow-bubble resonator with liquid inside and optically exciting vibrations with 100 MHz rates using only mW optical-input power. This constitutes the first time that any microfluidic system is optomechanically actuated. We further prove the feasibility of microfluidic optomechanics on liquids by demonstrating vibrations on organic fluids with viscous dissipation higher than blood viscosity while measuring density changes in the liquid via the vibration frequency shift. Our device will enable using cavity optomechanics for studying non-solid phases of matter, while light is easily coupled from the outer dry side of the capillary and fluid is provided using a standard syringe pump.