Remarkable changes in the two-dimensional angular optical scattering (TAOS) pattern are observed when an acoustically levitated water droplet with inclusions evolves into a dry aggregate. The emergence of polystyrene latex sphere inclusions near the droplet surface has a clear effect on the TAOS. A speckle pattern in the TAOS replaces the continuous contours associated with Mie scattering from a smooth droplet. Once the contours break up, this speckle pattern persists as the levitated droplet evaporates, making the transition from a droplet with inclusions to a dried aggregate. The initial emergence of the speckle pattern is observed for an inclusion volume fraction near 8%.
© 1999 Optical Society of America
(010.1110) Atmospheric and oceanic optics : Aerosols
(290.1310) Scattering : Atmospheric scattering
(290.4020) Scattering : Mie theory
(290.5850) Scattering : Scattering, particles
(290.5880) Scattering : Scattering, rough surfaces
Stephen Holler, Mario Surbek, Richard K. Chang, and Yong-Le Pan, "Two-dimensional angular optical scattering patterns as droplets evolve into clusters," Opt. Lett. 24, 1185-1187 (1999)