期刊
OPTICS EXPRESS
卷 16, 期 21, 页码 16390-16403出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.16.016390
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资金
- Science and Technologies Facility Council [HS30635]
We describe a simple and efficient means of using a white LED source to illuminate an optically levitated aerosol droplet to enable study of broadband Mie scattering. The backscattered resonances are imaged through a spectrograph and CCD which show high resolution Mie scattering intensity distributions across a spectral range of 480 to 700 nm. The wide spectral range allows assignment of resonance mode numbers and mode orders using conventional Mie theory calculations. Accurate droplet sizing, within +/- 2 nm, is possible for water-based droplets with radii between 2 mu m and 8 mu m. We additionally demonstrate that the refractive index dispersion can be determined from a single refractive index value at known wavelength. Finally, morphological droplet dynamics are presented showing non-linear droplet evaporation behaviour at a temporal resolution of 100 milliseconds. (c) 2008 Optical Society of America
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