29 August 2008 Aerosol tweezing with a super-continuum laser beam
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Abstract
Aerosol tweezing with a super-continuum laser source has been successfully demonstrated. Salt-water droplets in the range between 3 and 7 microns in diameters are trapped with a 300nm-wide super-continuum spectrum. As the spectrum covers a few Mie resonances, the optical force is averaged and the trapping efficiency varies smoothly with the square of the radius as in the case of the ray optics approximation. On-axis elastically back-scattered spectrum allows a direct and precise determination of the trapped droplet. Evaporation of a single droplet is precisely followed using this method. Alternative spectroscopic droplet sizing techniques are proposed and discussed.
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Marc Guillon, Marc Guillon, Kishan Dholakia, Kishan Dholakia, David McGloin, David McGloin, } "Aerosol tweezing with a super-continuum laser beam", Proc. SPIE 7038, Optical Trapping and Optical Micromanipulation V, 70381Q (29 August 2008); doi: 10.1117/12.793726; https://doi.org/10.1117/12.793726
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