AI Article Synopsis

  • Morphology-dependent resonances (MDRs) are leveraged to precisely measure the evaporation rates of tiny ethylene glycol droplets (1-2 micrometers) using laser trapping techniques.
  • The experimental setup involves trapping droplets containing a dye in a hollow fiber with two counter-propagating lasers, and additional laser excitation leads to fluorescence that helps analyze the evaporation process.
  • The study validates the accuracy of MDR mode identification through video analysis and utilizes the movement of trapped droplets to confirm the laser intensity in the trapping system.

Article Abstract

Morphology-dependent resonances (MDRs) are used to measure accurately the evaporation rates of laser-trapped 1- to 2-mum droplets of ethylene glycol. Droplets containing 3 x 10(-5) M Rhodamine-590 laser dye are optically trapped in a 20-mum hollow fiber by two counterpropagating 150-mW, 800-nm laser beams. A weaker 532-nm laser excites the dye, and fluorescence emission is observed near 560 nm as the droplet evaporates. A complete series of first-order TE and TM MDRs dominates the fluorescent output. MDR mode identification sizes the droplets and provides accurate evaporation rates. We verify the automated MDR mode identification by counting fringes in a videotape of the experiment. The longitudinal spring constant of the trap, measured by analysis of the videotaped motion of droplets perturbed from the trap center, provides independent verification of the laser's intensity within the trap.

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Source
http://dx.doi.org/10.1364/ao.40.002510DOI Listing

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