光镊中周期性空化的特性研究
Characterization of periodic cavitation in an optical tweezer
摘要：
显微蒸汽爆炸或空化气泡可以周期性地产生在光学镊子与微粒，部分吸收在捕获激光波长。在这项工作中，我们测量的尺寸分布和生产率的空化气泡的微粒直径为3 $μ$ m，使用高速录像和快速光电二极管。我们发现，有一个下限的最大气泡半径$R_{max}\sim 2~μ$ m，这可以解释的微粒尺寸。所测量的$R_{max}$中的多于$94 \%$在2和6 $μ$ m之间的范围内，而相同百分比的所测量的单个频率$f_i$或产生速率在10和200 Hz之间。光电二极管信号产生气泡寿命的上限，其至多是由瑞利方程预测的值的两倍。我们还报告了$R_{max}$，$f_i$和气泡寿命之间的经验关系。
英文摘要：
Microscopic vapor explosions or cavitation bubbles can be generated periodically in an optical tweezer with a microparticle that partially absorbs at the trapping laser wavelength. In this work we measure the size distribution and the production rate of cavitation bubbles for microparticles with a diameter of 3 $μ$m using high speed video recording and a fast photodiode. We find that there is a lower bound for the maximum bubble radius $R_{max}\sim 2~μ$m which can be explained in terms of the microparticle size. More than $94 \%$ of the measured $R_{max}$ are in the range between 2 and 6 $μ$m, while the same percentage of the measured individual frequencies $f_i$ or production rates are between 10 and 200 Hz. The photodiode signal yields an upper bound for the lifetime of the bubbles, which is at most twice the value predicted by the Rayleigh equation. We also report empirical relations between $R_{max}$, $f_i$ and the bubble lifetimes.
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