Viridiana Carmona-Sosa, José Ernesto Alba-Arroyo, and Pedro A. Quinto-Su
Microscopic vapor explosions or cavitation bubbles can be generated repeatedly in optical tweezers 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 μm using high-speed video recording and a fast photodiode. We find that there is a lower bound for the maximum bubble radius 𝑅max∼2 μm which can be explained in terms of the microparticle size. More than 94% of the measured 𝑅max are in the range between 2 and 6 μm, while the same percentage of the measured individual frequencies 𝑓𝑖 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 𝑅max, 𝑓𝑖, and the bubble lifetimes.
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