光学捕获液态气溶胶的参数探索
Parameter exploration of optically trapped liquid aerosols
摘要：
在研究$μs$时间尺度上光阱粒子的运动时，在低粘性介质如空气中，惯性不能被忽略。解决不寻常的和有趣的行为没有看到胶体捕获实验是可能的。为了解释这一现象，我们使用功率谱方法进行了参数研究的布朗运动的光学捕获的液体气溶胶液滴集中在临界阻尼制度。我们提出的证据表明，该系统是适当的描述一个简单的谐振子模型，其中必须包括一个描述Faxén的校正，但不一定是频率依赖的流体动力学校正斯托克斯定律。我们还提供了描述系统的行为在几个变量下的结果，并讨论了在解耦的参数负责所观察到的行为的困难。我们表明，由于相对较低的动态粘度和高陷阱刚度，它是很容易转移过阻尼和欠阻尼运动通过实验改变陷阱刚度或阻尼。我们的研究结果表明，稳定的气溶胶捕获可以在欠阻尼条件下实现，但在高捕获功率的有害的光学力的发病防止探测的稳定性上限，由于布朗运动。
英文摘要：
When studying the motion of optically trapped particles on the $μs$ time scale, in low viscous media such as air, inertia cannot be neglected. Resolution of unusual and interesting behaviour not seen in colloidal trapping experiments is possible. In attempt to explain the phenomena we use power spectral methods to perform a parameter study of the Brownian motion of optically trapped liquid aerosol droplets concentrated around the critically damped regime. We present evidence that the system is suitably described by a simple harmonic oscillator model which must include a description of Faxén's correction, but not necessarily frequency dependent hydrodynamic corrections to Stokes' law. We also provide results describing how the system behaves under several variables and discuss the difficulty in decoupling the parameters responsible for the observed behaviour. We show that due to the relatively low dynamic viscosity and high trap stiffness it is easy to transfer between over- and under-damped motion by experimentally altering either trap stiffness or damping. Our results suggest stable aerosol trapping may be achieved in under-damped conditions, but the onset of deleterious optical forces at high trapping powers prevents the probing of the upper stability limits due to Brownian motion.
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